CN104868155A - Thin-layer lithium ion battery and preparation method thereof - Google Patents

Abstract

The invention discloses a thin-layer lithium ion battery. The thin-layer lithium ion battery comprises a housing, an electrolyte, an isolating membrane, a positive plate, and a negative plate; the isolating membrane is sandwiched by the positive plate and the negative plate; the isolating membrane is a carbon fiber honeycomb composite membrane; a space among the positive plate, the negative plate and the isolating plate is filled with the electrolyte; the electrolyte contains aluminum powder; the positive plate is obtained by coating a graphite foil current collector with a positive electrode active material slurry; and the negative plate is obtained by coating a metal foil current collector with a negative electrode active material slurry. According to the thin-layer lithium ion battery, the carbon fiber composite membrane is used for isolating electrons and guiding ions; the carbon fiber composite membrane shapes like a honeycomb, and each unit possesses excellent symmetrical performance, so that electrical property uniformity and appropriate electricity density are maintained in ion guiding processes; and excellent battery uniform slow releasing is realized preferably. And in addition, aluminum powder is added into the electrolyte, and uniform mixing of the aluminum particles with the electrolyte is realized, so that conduction effect is improved, and electron transmission is accelerated. The thin-layer lithium ion battery is suitable for microscale design, and battery electricity effect is not influenced.

Description

A kind of thin layer lithium ion battery and make the method for this thin layer lithium ion battery

[technical field]

The invention belongs to battery power field, particularly relate to the thin layer lithium ion battery adopting modified model barrier film to make, and make this thin layer lithium ion battery method.

[background technology]

Along with eco-friendly power source concept, sustainable development source strategy is rooted in the hearts of the people, the solar energy of environmental protection, the development of the industry such as LED illumination and lithium ion battery is in continuous propradation, the application scale continuous enlargement of lithium ion battery, lithium ion battery is with its high-power charging and discharging capabilities, high security and long-acting useful life etc., feature occupied dominant position gradually in the market, power lithium-ion battery has large discharge current charge-discharge electricity, Large Copacity electric power storage, be usually used in providing the lithium ion battery driving power, the most common electric vehicle that is applied in of power lithium-ion battery, in electric bicycle and electric automobile, in lithium ion battery output, marketing scale, while application arranges and increases substantially, its stability, fail safe becomes the key problem be concerned by people more.

Lithium ion battery is mainly made up of positive plate, negative plate, barrier film, electrolyte, housing five major part, the battery cell that several stack gradually is generally comprised in lithium ion battery, each battery cell comprises winding or the negative plate superposed, barrier film and positive plate, positive plate comprises positive active material, conductive agent, binding agent and collector composition, the slurry coating mixed by positive active material and conductive agent is bonded in the collection liquid surface of metal forming, forms positive pole; Negative pole comprises negative electrode active material, conductive agent, binding agent and collector composition, and the slurry mixed by negative electrode active material and conductive agent coating is bonded in the collection liquid surface of metal forming, forms negative pole; Be interposed between barrier film between negative plate and positive plate, play the effect of electronics obstruct, ion conducting, barrier film is a kind of special composite membrane, and composition has PP, PE or its mixture; Described electrolyte is full of within shell, between positive plate and negative plate, the solution that electrolyte is made up of lithium salts and organic solvent, and housing is the sealing outer package device of parcel internal functional elements, has aluminum hull, box hat, aluminum plastic film etc.

Because high-capacity lithium battery is all formed by several battery cells are stacked usually, each battery cell contains certain thickness, the thickness of whole lithium battery is larger, improper electrical appliance miniaturized design, also some lithium battery has done thin layer design, but because electrolyte thickness is thinning, electron stream speed reduces, than the power effect that have impact on battery largely.And collector needs the circuit that cell active materials produces to collect externally to export to form larger current, therefore collector also needs fully to contact with movable material, and should reduce its internal resistance to improve its performance.

[summary of the invention]

The present invention is directed to above situation, excessive in order to overcome lithium ion battery volume in prior art, and the physics mode of routine reduces the problem that its volume can reduce its electric current percent of pass, discharge power, use efficiency, and propose a kind of thin layer lithium ion battery, this thin layer lithium ion battery improves the utilance of collector, make electron flow speed higher, improve the performance that collector internal resistance improves thin layer lithium ion.

Thin layer lithium ion battery proposed by the invention, comprising shell, electrolyte, barrier film, positive plate and negative plate, wherein be folded with barrier film between positive plate and negative plate, it is characterized in that, this barrier film is the cellular composite membrane of carbon fiber, positive plate, between negative plate and barrier film, be full of electrolyte, in this electrolyte, be mixed into aluminium elemental powders; Wherein positive plate on graphite foil collector, applies positive electrode active materials slurry form; Described negative plate on metal forming collector, applies negative active material slurry form.

Wherein positive electrode active materials slurry is covered on graphite foil collector by binding agent, and wherein negative active material slurry is covered in copper foil current collector by binding agent.

Make a method for thin layer lithium ion battery, comprising the assembling of the preparation of positive plate, the preparation of negative plate and battery,

The preparation of described positive plate: with mass fraction proportioning, by positive-active composition 55-60 part, binding agent 3 parts, positive conductive agent 8 parts, joins in the solvent of 89-90 part, stirs and forms uniform positive electrode active materials slurry; When the viscosity of this slurry is within the scope of 5000-15000mPa.S, this positive electrode active materials slurry is coated on graphite foil collector equably, the plus plate current-collecting body being coated with positive electrode active materials slurry is dried, cut shaping positive plate after roll-in;

The preparation of described negative plate: with mass fraction proportioning, joins in 100-130 part solvent by negative electrode active composition 80-115 part, binding agent 1.5-5 part, cathode conductive agent 1-5 part, stirs and forms uniform negative active material slurry; This negative active material slurry is coated on equably on metal forming collector, the metal forming collector being coated with negative active material slurry is dried, cut into negative plate after roll-in;

The assembling of described battery: the positive plate that above-mentioned steps is completed, sandwiched barrier film in the middle of negative plate, this barrier film is cellular carbon fiber composite membrane, this film comprises one deck carbon-fiber film and one deck polypropylene screen, wherein carbon-fiber film is formed according to honeycomb style braiding by carbon fiber, by this positive plate, negative plate and barrier film form a battery core, this battery core is contained in battery container, injecting 2-6g/Ah concentration is the electrolyte of 0.8-2mol/L, add the aluminium elemental powders that weight fraction is 3-5.8% in the electrolytic solution, then battery container is sealed, make lithium ion battery.

Further, in the preparation of above-mentioned positive plate wherein, described positive-active composition is cobalt acid lithium LiCoO₂, LiFePO 4 LiFePO₄in one or more mixtures; Described binding agent is Kynoar (PVDF), and described positive conductive agent is any one or multiple mixture in acetylene black, conductive black, electrically conductive graphite and carbon nano-tube; Described solvent is any one or several mixture in 1-METHYLPYRROLIDONE (NMP), dimethyl formamide (DMF), diethylformamide (DEF), dimethyl sulfoxide (DMSO) (DMSO), oxolane (THF) and water and alcohols; Described whipping process completes in de-airing mixer.

And in the preparation of negative plate wherein, described negative electrode active composition is any one or a few mixture in native graphite, Delanium, petroleum coke, organic cracking carbon, carbonaceous mesophase spherules, carbon fiber, ashbury metal and silicon alloy; Described binding agent comprises fluorine resin and polyolefin compound; Described cathode conductive agent is any one or multiple mixture in acetylene black, conductive black, electrically conductive graphite and carbon nano-tube; Described solvent is any one or several mixture in 1-METHYLPYRROLIDONE (NMP), dimethyl formamide (DMF), diethylformamide (DEF), dimethyl sulfoxide (DMSO) (DMSO), oxolane (THF) and water and alcohols.

Described positive electrode active materials slurry is uniformly coated on graphite foil collector, this graphite foil collector thickness is that 35-60 μm of coating speed controls at 1-5m/min, after even spread slurry, dry at the temperature of 90-150 °, after roll-in, be cut into that width is 64mm, length is the positive plate of 255mm.

Described negative current collector is after even spread slurry, and at the temperature of 80-95 ° after oven dry, roll-in, being cut into width is 66mm, and length is the negative plate of 258mm; Described metal forming collector is copper foil current collector or aluminum foil current collector

The present invention adopts carbon fiber composite membrane can intercept the effect of electronics, conducting ion, and carbon fiber is cellular, and each unit has high symmetry, becomes to keep electrically even, saturating electric reasonable organization in the process of conducting ion; Better battery uniform slow release effect can be realized.And Lu's elemental powders added in the electrolytic solution, the mixing of its uniform particles in the electrolytic solution, can strengthen conduction effect, accelerates electron transmission.This battery made is applicable to miniaturized design, and can not affect battery electric power effect.

[accompanying drawing explanation]

Fig. 1 is the structure chart of barrier film of the present invention;

Fig. 2 is the sectional structure chart of barrier film of the present invention;

Wherein 10, carbon-fiber film; 20, polypropylene screen;

[embodiment]

Below in conjunction with the specific embodiment of the present invention, lithium ion battery of the present invention and the method preparing lithium ion battery are described in further detail.

Wherein thin layer lithium ion battery of the present invention, comprising shell, electrolyte, barrier film, positive plate and negative plate, wherein be folded with barrier film between positive plate and negative plate, it is characterized in that, this barrier film is the cellular composite membrane of carbon fiber, positive plate, between negative plate and barrier film, be full of electrolyte, in this electrolyte, be mixed into aluminium elemental powders; Wherein positive plate on graphite foil collector, applies positive electrode active materials slurry form; Described negative plate on metal forming collector, applies negative active material slurry form.

Wherein positive electrode active materials slurry is covered on graphite foil collector by binding agent, and wherein negative active material slurry is covered in copper foil current collector by binding agent.

Make a method for thin layer lithium ion battery, comprising the assembling of the preparation of positive plate, the preparation of negative plate and battery,

The preparation of described positive plate: with mass fraction proportioning, by positive-active composition 55-60 part, binding agent 3 parts, positive conductive agent 8 parts, joins in the solvent of 89-90 part, stirs and forms uniform positive electrode active materials slurry; When the viscosity of this slurry is within the scope of 5000-15000mPa.S, this positive electrode active materials slurry is coated on graphite foil collector equably, the plus plate current-collecting body being coated with positive electrode active materials slurry is dried, cut shaping positive plate after roll-in;

The preparation of described negative plate: with mass fraction proportioning, joins in 100-130 part solvent by negative electrode active composition 80-115 part, binding agent 1.5-5 part, cathode conductive agent 1-5 part, stirs and forms uniform negative active material slurry; This negative active material slurry is coated on equably on metal forming collector, the metal forming collector being coated with negative active material slurry is dried, cut into negative plate after roll-in;

The assembling of described battery: the positive plate that above-mentioned steps is completed, sandwiched barrier film in the middle of negative plate, this barrier film is cellular carbon fiber composite membrane, this film comprises one deck carbon-fiber film 10 and one deck polypropylene screen 20, wherein carbon-fiber film 10 is formed according to honeycomb style braiding by carbon fiber, by this positive plate, negative plate and barrier film form a battery core, this battery core is contained in battery container, injecting 2-6g/Ah concentration is the electrolyte of 0.8-2mol/L, add the aluminium elemental powders that weight fraction is 3-5.8% in the electrolytic solution, then battery container is sealed, make lithium ion battery.

In the preparation of above-mentioned positive plate wherein, described positive-active composition is cobalt acid lithium LiCoO₂, LiFePO 4 LiFePO₄in one or more mixtures; Described binding agent is Kynoar (PVDF), and described positive conductive agent is any one or multiple mixture in acetylene black, conductive black, electrically conductive graphite and carbon nano-tube; Described solvent is any one or several mixture in 1-METHYLPYRROLIDONE (NMP), dimethyl formamide (DMF), diethylformamide (DEF), dimethyl sulfoxide (DMSO) (DMSO), oxolane (THF) and water and alcohols; Described whipping process completes in de-airing mixer.

And in the preparation of negative plate wherein, described negative electrode active composition is any one or a few mixture in native graphite, Delanium, petroleum coke, organic cracking carbon, carbonaceous mesophase spherules, carbon fiber, ashbury metal and silicon alloy; Described binding agent comprises fluorine resin and polyolefin compound; Described cathode conductive agent is any one or multiple mixture in acetylene black, conductive black, electrically conductive graphite and carbon nano-tube; Described solvent is any one or several mixture in 1-METHYLPYRROLIDONE (NMP), dimethyl formamide (DMF), diethylformamide (DEF), dimethyl sulfoxide (DMSO) (DMSO), oxolane (THF) and water and alcohols.

Described positive electrode active materials slurry is uniformly coated on graphite foil collector, this graphite foil collector thickness is that 35-60 μm of coating speed controls at 1-5m/min, after even spread slurry, dry at the temperature of 90-150 °, after roll-in, be cut into that width is 64mm, length is the positive plate of 255mm.

Described negative current collector is after even spread slurry, and at the temperature of 80-95 ° after oven dry, roll-in, being cut into width is 66mm, and length is the negative plate of 258mm; Described metal forming collector is copper foil current collector or aluminum foil current collector

The present invention adopts carbon fiber composite membrane can intercept the effect of electronics, conducting ion, and carbon fiber is cellular, and each unit has high symmetry, becomes to keep electrically even, saturating electric reasonable organization in the process of conducting ion; Better battery uniform slow release effect can be realized.And Lu's elemental powders added in the electrolytic solution, the mixing of its uniform particles in the electrolytic solution, can strengthen conduction effect, accelerates electron transmission.This battery made is applicable to miniaturized design, and can not affect battery electric power effect.

Embodiment 1:

Thin layer lithium ion battery in the present embodiment, comprising shell, electrolyte, barrier film, positive plate and negative plate, wherein be folded with barrier film between positive plate and negative plate, this barrier film is the cellular composite membrane of carbon fiber, positive plate, between negative plate and barrier film, be full of electrolyte, in this electrolyte, be mixed into aluminium elemental powders; Wherein positive plate on graphite foil collector, applies positive electrode active materials slurry form; Described negative plate on metal forming collector, applies negative active material slurry form.

Wherein positive electrode active materials slurry is covered on graphite foil collector by binding agent, and wherein negative active material slurry is covered in copper foil current collector by binding agent.

In the present embodiment, following methods is adopted to make thin layer lithium ion battery, comprising the assembling of the preparation of positive plate, the preparation of negative plate and battery,

The preparation of described positive plate: with mass fraction proportioning, by positive-active composition 55 parts, binding agent 3 parts, positive conductive agent 8 parts, joins in the solvent of 89 parts, stirs and forms uniform positive electrode active materials slurry; When the viscosity of this slurry is within the scope of 5000-15000mPa.S, this positive electrode active materials slurry is coated on graphite foil collector equably, the plus plate current-collecting body being coated with positive electrode active materials slurry is dried, cut shaping positive plate after roll-in;

The preparation of described negative plate: with mass fraction proportioning, joins in 100 parts of solvents by negative electrode active composition 80 parts, binding agent 1.5 parts, cathode conductive agent 2 parts, stirs and forms uniform negative active material slurry; This negative active material slurry is coated on equably on metal forming collector, the metal forming collector being coated with negative active material slurry is dried, cut into negative plate after roll-in;

The assembling of described battery: sandwiched barrier film in the middle of the positive plate that above-mentioned steps is completed, negative plate, this barrier film is cellular carbon fiber composite membrane, this film comprises one deck carbon-fiber film and one deck polypropylene screen, wherein carbon-fiber film is formed according to honeycomb style braiding by carbon fiber, a battery core is formed by this positive plate, negative plate and barrier film, this battery core is contained in battery container, injecting 2-6g/Ah concentration is the electrolyte of 0.8mol/L, then battery container is sealed, make lithium ion battery.

In the preparation of above-mentioned positive plate wherein, described positive-active composition is cobalt acid lithium LiCoO₂, LiFePO 4 LiFePO₄in one or more mixtures; Described binding agent is Kynoar (PVDF), and described positive conductive agent is any one or multiple mixture in acetylene black, conductive black, electrically conductive graphite and carbon nano-tube; Described solvent is any one or several mixture in 1-METHYLPYRROLIDONE (NMP), dimethyl formamide (DMF), diethylformamide (DEF), dimethyl sulfoxide (DMSO) (DMSO), oxolane (THF) and water and alcohols; Described whipping process completes in de-airing mixer.

And in the preparation of negative plate wherein, described negative electrode active composition is any one or a few mixture in native graphite, Delanium, petroleum coke, organic cracking carbon, carbonaceous mesophase spherules, carbon fiber, ashbury metal and silicon alloy; Described binding agent comprises fluorine resin and polyolefin compound; Described cathode conductive agent is any one or multiple mixture in acetylene black, conductive black, electrically conductive graphite and carbon nano-tube; Described solvent is any one or several mixture in 1-METHYLPYRROLIDONE (NMP), dimethyl formamide (DMF), diethylformamide (DEF), dimethyl sulfoxide (DMSO) (DMSO), oxolane (THF) and water and alcohols.

Described positive electrode active materials slurry is uniformly coated on graphite foil collector, this graphite foil collector thickness is that 35-60 μm of coating speed controls at 1-5m/min, after even spread slurry, dry at the temperature of 90-150 °, after roll-in, be cut into that width is 64mm, length is the positive plate of 255mm.

Described negative current collector is after even spread slurry, and at the temperature of 80-95 ° after oven dry, roll-in, being cut into width is 66mm, and length is the negative plate of 258mm; Described metal forming collector is copper foil current collector or aluminum foil current collector.

Embodiment 2:

The structure of thin layer lithium ion battery is substantially similar to enforcement 1 in the present embodiment, and the formula just in manufacturing process is not too identical:

The preparation of described positive plate: with mass fraction proportioning, by positive-active composition 58 parts, binding agent 3 parts, positive conductive agent 8 parts, joins in the solvent of 90 parts, stirs and forms uniform positive electrode active materials slurry; When the viscosity of this slurry is within the scope of 5000-15000mPa.S, this positive electrode active materials slurry is coated on graphite foil collector equably, the plus plate current-collecting body being coated with positive electrode active materials slurry is dried, cut shaping positive plate after roll-in;

The preparation of described negative plate: with mass fraction proportioning, joins in 112 parts of solvents by negative electrode active composition 95 parts, binding agent 3 parts, cathode conductive agent 2.5 parts, stirs and forms uniform negative active material slurry; This negative active material slurry is coated on equably on metal forming collector, the metal forming collector being coated with negative active material slurry is dried, cut into negative plate after roll-in;

The assembling of described battery: the positive plate that above-mentioned steps is completed, sandwiched barrier film in the middle of negative plate, this barrier film is cellular carbon fiber composite membrane, this film comprises one deck carbon-fiber film and one deck polypropylene screen, wherein carbon-fiber film is formed according to honeycomb style braiding by carbon fiber, by this positive plate, negative plate and barrier film form a battery core, this battery core is contained in battery container, injecting 2-6g/Ah concentration is the electrolyte of 0.8-2mol/L, add the aluminium elemental powders that weight fraction is 4.5% in the electrolytic solution, then battery container is sealed, make lithium ion battery.

In the preparation of above-mentioned positive plate wherein, described positive-active composition is cobalt acid lithium LiCoO₂, LiFePO 4 LiFePO₄in one or more mixtures; Described binding agent is Kynoar (PVDF), and described positive conductive agent is any one or multiple mixture in acetylene black, conductive black, electrically conductive graphite and carbon nano-tube; Described solvent is any one or several mixture in 1-METHYLPYRROLIDONE (NMP), dimethyl formamide (DMF), diethylformamide (DEF), dimethyl sulfoxide (DMSO) (DMSO), oxolane (THF) and water and alcohols; Described whipping process completes in de-airing mixer.

And in the preparation of negative plate wherein, described negative electrode active composition is any one or a few mixture in native graphite, Delanium, petroleum coke, organic cracking carbon, carbonaceous mesophase spherules, carbon fiber, ashbury metal and silicon alloy; Described binding agent comprises fluorine resin and polyolefin compound; Described cathode conductive agent is any one or multiple mixture in acetylene black, conductive black, electrically conductive graphite and carbon nano-tube; Described solvent is any one or several mixture in 1-METHYLPYRROLIDONE (NMP), dimethyl formamide (DMF), diethylformamide (DEF), dimethyl sulfoxide (DMSO) (DMSO), oxolane (THF) and water and alcohols.

Described positive electrode active materials slurry is uniformly coated on graphite foil collector, this graphite foil collector thickness is that 35-60 μm of coating speed controls at 1-5m/min, after even spread slurry, dry at the temperature of 90-150 °, after roll-in, be cut into that width is 64mm, length is the positive plate of 255mm.

Described negative current collector is after even spread slurry, and at the temperature of 80-95 ° after oven dry, roll-in, being cut into width is 66mm, and length is the negative plate of 258mm; Described metal forming collector is copper foil current collector or aluminum foil current collector

Because high-capacity lithium battery is all formed by several battery cells are stacked usually, each battery cell contains certain thickness, the thickness of whole lithium battery is larger, improper electrical appliance miniaturized design, also some lithium battery has done thin layer design, but because electrolyte thickness is thinning, electron stream speed reduces, than the power effect that have impact on battery largely.And collector needs the circuit that cell active materials produces to collect externally to export to form larger current, therefore collector also needs fully to contact with movable material, and should reduce its internal resistance to improve its performance.

The above, it is only present pre-ferred embodiments, not any pro forma restriction is done to the present invention, although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention, any those skilled in the art, do not departing within the scope of technical solution of the present invention, make a little change when the technology contents of above-mentioned announcement can be utilized or be modified to the Equivalent embodiments of equivalent variations, in every case be do not depart from technical solution of the present invention content, any simple modification that above embodiment is done is referred to according to the technology of the present invention, equivalent variations and modification, all belong in the scope of technical solution of the present invention.

Claims (7)

1. a thin layer lithium ion battery, comprising shell, electrolyte, barrier film, positive plate and negative plate, wherein be folded with barrier film between positive plate and negative plate, it is characterized in that, this barrier film is the cellular composite membrane of carbon fiber, positive plate, between negative plate and barrier film, be full of electrolyte, in this electrolyte, be mixed into aluminium elemental powders; Wherein positive plate on graphite foil collector, applies positive electrode active materials slurry form; Described negative plate on metal forming collector, applies negative active material slurry form.

2. thin layer lithium ion battery according to claim 1, wherein positive electrode active materials slurry is covered on graphite foil collector by binding agent, and wherein negative active material slurry is covered in copper foil current collector by binding agent.

3. make a method for thin layer lithium ion battery, comprising the assembling of the preparation of positive plate, the preparation of negative plate and battery,

The preparation of described positive plate: with mass fraction proportioning, by positive-active composition 55-60 part, binding agent 3 parts, positive conductive agent 8 parts, joins in the solvent of 89-90 part, stirs and forms uniform positive electrode active materials slurry; When the viscosity of this slurry is within the scope of 5000-15000mPa.S, this positive electrode active materials slurry is coated on graphite foil collector equably, the plus plate current-collecting body being coated with positive electrode active materials slurry is dried, cut shaping positive plate after roll-in;

The preparation of described negative plate: with mass fraction proportioning, joins in 100-130 part solvent by negative electrode active composition 80-115 part, binding agent 1.5-5 part, cathode conductive agent 1-5 part, stirs and forms uniform negative active material slurry, this negative active material slurry is coated on equably on metal forming collector, the metal forming collector being coated with negative active material slurry is dried, cut into negative plate after roll-in, the assembling of described battery: the positive plate that above-mentioned steps is completed, sandwiched barrier film in the middle of negative plate, this barrier film is cellular carbon fiber composite membrane, this film comprises one deck carbon-fiber film and one deck polypropylene screen, wherein carbon-fiber film is formed according to honeycomb style braiding by carbon fiber, by this positive plate, negative plate and barrier film form a battery core, this battery core is contained in battery container, injecting 2-6g/Ah concentration is the electrolyte of 0.8-2mol/L, add the aluminium elemental powders that weight fraction is 3-5.8% in the electrolytic solution, then battery container is sealed, make lithium ion battery.

4. make the method for thin layer lithium ion battery according to claim 3, it is characterized in that, in the preparation of above-mentioned positive plate wherein, described positive-active composition is one or more mixtures in cobalt acid lithium LiCoO2, LiFePO 4 LiFePO4; Described binding agent is Kynoar (PVDF), and described positive conductive agent is any one or multiple mixture in acetylene black, conductive black, electrically conductive graphite and carbon nano-tube; Described solvent is any one or several mixture in 1-METHYLPYRROLIDONE (NMP), dimethyl formamide (DMF), diethylformamide (DEF), dimethyl sulfoxide (DMSO) (DMSO), oxolane (THF) and water and alcohols; Described whipping process completes in de-airing mixer.

5. make the method for thin layer lithium ion battery according to claim 3, it is characterized in that, and in the preparation of negative plate wherein, described negative electrode active composition is any one or a few mixture in native graphite, Delanium, petroleum coke, organic cracking carbon, carbonaceous mesophase spherules, carbon fiber, ashbury metal and silicon alloy; Described binding agent comprises fluorine resin and polyolefin compound; Described cathode conductive agent is any one or multiple mixture in acetylene black, conductive black, electrically conductive graphite and carbon nano-tube; Described solvent is any one or several mixture in 1-METHYLPYRROLIDONE (NMP), dimethyl formamide (DMF), diethylformamide (DEF), dimethyl sulfoxide (DMSO) (DMSO), oxolane (THF) and water and alcohols.

6. make the method for thin layer lithium ion battery according to claim 3, it is characterized in that, described positive electrode active materials slurry is uniformly coated on graphite foil collector, this graphite foil collector thickness is that 35-60 μm of coating speed controls at 1-5m/min, after even spread slurry, dry at the temperature of 90-150 °, after roll-in, be cut into that width is 64mm, length is the positive plate of 255mm.

7. make the method for thin layer lithium ion battery according to claim 3, it is characterized in that, described negative current collector is after even spread slurry, and at the temperature of 80-95 ° after oven dry, roll-in, being cut into width is 66mm, and length is the negative plate of 258mm; Described metal forming collector is copper foil current collector or aluminum foil current collector.