CN113471404A - Inorganic ceramic coating negative plate of lithium ion battery and manufacturing method thereof - Google Patents

Abstract

The invention discloses an inorganic ceramic coating negative plate of a lithium ion battery and a manufacturing method thereof. The inorganic ceramic coating negative plate can reduce the direct contact of the active substance and the electrolyte, thereby reducing the side reaction of the negative active substance and the electrolyte, simultaneously increasing the electrolyte holding capacity, reducing the phenomenon of lithium precipitation on the surface of the negative electrode, and improving the capacity, the cycle performance, the rate performance and the safety performance of a battery core.

Description

Inorganic ceramic coating negative plate of lithium ion battery and manufacturing method thereof

Technical Field

The invention relates to the technical field of lithium ion batteries, in particular to an inorganic ceramic coating negative plate of a lithium ion battery and a manufacturing method thereof.

Background

The lithium ion battery has the advantages of high working voltage, high energy density, long service life, small self-discharge, no memory effect, good safety performance and no pollution, and is widely applied to the fields of automobiles, notebook computers, mobile phones, cameras, electric bicycles, mobile power supplies, medical equipment, military industry, aerospace and the like.

The lithium separation from the negative electrode is one of the key factors influencing the safety performance and the cycle life of the lithium ion battery, and particularly, the lithium separation is more likely to occur when the electrolyte on the surface of the negative electrode is not sufficiently wetted and the electrolyte on the surface of the negative electrode is not uniformly distributed or is in a state of less electrolyte. Lithium dendrite formed by lithium precipitation of the negative electrode can pierce the isolating membrane to cause internal short circuit and cause thermal runaway, so that safety accidents such as fire, explosion and the like of the battery occur.

The graphite has the characteristic of anisotropy, the diffusion direction of lithium ions in a graphite laminated structure is influenced, the gram capacity of the graphite is limited, and the phenomenon of lithium precipitation is easy to occur in the charging and discharging processes; the hard carbon has anisotropic structural characteristics, the interlayer spacing is larger than that of graphite, and the diffusion rate of lithium ions is high in the charging and discharging process, so that the hard carbon has good rate performance, the lithium precipitation phenomenon is not easy to occur in the high-rate charging and discharging process, but the first charging and discharging efficiency of the hard carbon is low, and the exertion of the battery capacity is influenced.

Disclosure of Invention

Aiming at the phenomenon of lithium precipitation easily occurring in graphite negative electrodes, the invention provides an inorganic ceramic coating negative electrode plate of a lithium ion battery and a manufacturing method thereof, which can increase the electrolyte retention capacity of the battery, improve the uniformity of current density distribution in the battery in the charging and discharging process, and prevent lithium dendrites from being easily formed on the surface of the negative electrode, thereby improving the capacity exertion, safety performance, rate capability and cycle performance of the battery.

In order to achieve the purpose, the invention adopts the following technical scheme:

the inorganic ceramic coating negative plate comprises a current collector layer, two auxiliary material layers and two inorganic ceramic coatings, wherein the two auxiliary material layers are attached to two auxiliary material surfaces of the current collector, and the two inorganic ceramic coatings are coated on the two auxiliary material layers.

Further, the thickness of the current collector is 6-25 mu m, and the total surface density of the two auxiliary material layers is 40-240 g/m²And the total thickness of the two inorganic ceramic coatings is 2-36 mu m.

Further, the current collector is a copper foil; the auxiliary material layer contains active substance and is conductiveThe composite material comprises an active substance, a thickening agent and a binder, wherein the active substance is graphite and hard carbon, the conductive agent is SP (conductive carbon black), the thickening agent is CMC (sodium carboxymethyl cellulose), the binder is SBR (styrene butadiene rubber), and the auxiliary material layer comprises the following substances in percentage by mass: 80-93% of graphite, 2-15% of hard carbon, 0.8-2.0% of SP (conductive carbon black), 1.5-1.9% of CMC (sodium carboxymethyl cellulose) and 1.5-2.5% of SBR (styrene butadiene rubber); the inorganic ceramic coating contains an inorganic ceramic material, a suspending agent and a binder, wherein the inorganic ceramic material is Al₂O₃(aluminum oxide) or SiO₂(silica) or ZrO₂(zirconium dioxide) one or more, wherein the suspending agent is CMC (sodium carboxymethylcellulose), the binder is SBR (styrene butadiene rubber), and the inorganic ceramic coating comprises the following substances in percentage by mass: 78-91% of inorganic ceramic material, 3-9% of CMC (sodium carboxymethyl cellulose) and 6-13% of SBR (styrene butadiene rubber).

Further, the specific surface area of the active material graphite is 1-3 m²The particle size distribution D10 is 4-10 μm, D50 is 12-18 μm, and D90 is 20-35 μm; the specific surface area of the active substance hard carbon is 3-6 m²The particle size distribution D10 is 2-6 μm, D50 is 7-12 μm, and D90 is 14-22 μm; the purity of the inorganic ceramic material is more than 99.999 percent, and the specific surface area is 2-8 m²(ii)/g, the particle size distribution range is 50 to 900 nm.

Further, the manufacturing method comprises the following steps:

(1) uniformly stirring graphite, hard carbon, SP (conductive carbon black), CMC (sodium carboxymethyl cellulose) and SBR (styrene butadiene rubber) in stirring equipment by taking deionized water as a dispersing agent to obtain lithium ion battery cathode slurry;

(2) coating the lithium ion battery negative electrode slurry obtained in the step (1) on two auxiliary material surfaces of a current collector and baking;

(3) rolling the negative plate obtained in the step (2), wherein the rolling compaction density is 1.4-1.8 g/cm³；

(4) And (3) taking deionized water as a dispersing agent, uniformly stirring the inorganic ceramic material, CMC (sodium carboxymethylcellulose) and SBR (styrene butadiene rubber) in stirring equipment to obtain inorganic ceramic coating slurry, coating the inorganic ceramic coating slurry on the surfaces of the two auxiliary material layers of the rolled negative plate obtained in the step (3), and baking to obtain the lithium ion battery inorganic ceramic coating negative plate.

The invention has the beneficial effects that: the inorganic ceramic material with strong electrolyte wetting capacity coated on the surface of the auxiliary material layer of the negative plate can provide sufficient electrolyte for the surface of the negative electrode, so that the uniformity of current density distribution inside the lithium ion battery in the charging and discharging process is improved, the possibility of lithium precipitation on the surface of the negative electrode is reduced, and the direct contact between the electrolyte and a negative active material is reduced, so that the side reaction between the negative active material and the electrolyte is reduced; the method has the advantages that the hard carbon with proper anisotropy, larger interlayer spacing and low first charge-discharge efficiency is doped into the graphite, so that the rate performance of the lithium ion battery can be improved, the capacity performance of the lithium ion battery is not greatly influenced, and the lithium separation phenomenon is not easy to occur on the surface of the negative electrode in the high-rate charge-discharge process.

Detailed Description

The present invention will be further described with reference to specific embodiments, which are provided for illustrative and explanatory purposes only and should not be construed as limiting the scope of the present invention in any way.

Example 1:

(1) deionized water is used as a dispersing agent, and the mass percentage of graphite: hard carbon: SP (conductive carbon black): CMC (sodium carboxymethylcellulose): SBR (styrene butadiene rubber) = 90.4: 5.0: 1.0: 1.6: and 2.0, uniformly stirring the components in a stirring device to obtain the lithium ion battery cathode slurry. Wherein the specific surface area of the graphite is 1.4 m²The particle size distribution of the graphite is that D10 is 5 mu m, D50 is 13 mu m, and D90 is 25 mu m; the specific surface area of the hard carbon was 4 m²(g), the hard carbon particle size distribution has a D10 of 3 μm, a D50 of 9 μm, and a D90 of 18 μm.

(2) Coating the lithium ion battery negative electrode slurry obtained in the step (1) on two auxiliary material surfaces of a copper foil with the thickness of 6 mu m and baking, wherein the surface density of the coated single surface is 90 +/-1 g/m²The density of the coated double-sided surface is 180 +/-2 g/m²。

(3) Rolling the negative plate obtained in the step (2) to obtain a rolled compact density of 1.57g/cm³。

(4) Deionized water is taken as a dispersant, and the mass percent is Al₂O₃(alumina): CMC (sodium carboxymethylcellulose): SBR (styrene butadiene rubber) = 85: 5: 10 are evenly stirred in a stirring device to obtain inorganic ceramic coating slurry, wherein Al is₂O₃(alumina) had a purity of 99.9992% and a specific surface area of 4 m²(ii)/g, the particle size distribution range is 200 to 600 nm. And (4) coating the inorganic ceramic coating slurry on the surfaces of the two auxiliary material layers of the rolled negative plate obtained in the step (3), and baking to obtain the negative plate with the inorganic ceramic coating of the lithium ion battery, wherein the thicknesses of the two inorganic ceramic coatings after drying are both 2 microns.

Example 2:

(1) deionized water is used as a dispersing agent, and the mass percentage of graphite: hard carbon: SP (conductive carbon black): CMC (sodium carboxymethylcellulose): SBR (styrene butadiene rubber) = 87.0: 8.0: 1.1: 1.7: 2.2, uniformly stirring the components in a stirring device to obtain the lithium ion battery cathode slurry. Wherein the specific surface area of the graphite is 1.4 m²The particle size distribution of the graphite is that D10 is 5 mu m, D50 is 13 mu m, and D90 is 25 mu m; the specific surface area of the hard carbon was 4 m²(g), the hard carbon particle size distribution has a D10 of 3 μm, a D50 of 9 μm, and a D90 of 18 μm.

(2) Coating the lithium ion battery negative electrode slurry obtained in the step (1) on two auxiliary material surfaces of a copper foil with the thickness of 6 mu m and baking, wherein the surface density of the coated single surface is 90 +/-1 g/m²The density of the coated double-sided surface is 180 +/-2 g/m²。

(3) Rolling the negative plate obtained in the step (2) to obtain a rolled compact density of 1.57g/cm³。

(4) Deionized water is taken as a dispersant, and the mass percent is Al₂O₃(alumina): CMC (sodium carboxymethylcellulose): SBR (styrene butadiene rubber) = 85: 5: 10 are evenly stirred in a stirring device to obtain inorganic ceramic coating slurry, wherein Al is₂O₃(Trioxy)Dialuminum) with a purity of 99.9992% and a specific surface area of 4 m²(ii)/g, the particle size distribution range is 200 to 600 nm. And (4) coating the inorganic ceramic coating slurry on the surfaces of the two auxiliary material layers of the rolled negative plate obtained in the step (3), and baking to obtain the negative plate with the inorganic ceramic coating of the lithium ion battery, wherein the thicknesses of the two inorganic ceramic coatings after drying are both 2 microns.

Example 3:

(1) deionized water is used as a dispersing agent, and the mass percentage of graphite: hard carbon: SP (conductive carbon black): CMC (sodium carboxymethylcellulose): SBR (styrene butadiene rubber) = 90.4: 5.0: 1.0: 1.6: and 2.0, uniformly stirring the components in a stirring device to obtain the lithium ion battery cathode slurry. Wherein the specific surface area of the graphite is 1.8m²The particle size distribution of the graphite is that D10 is 5 mu m, D50 is 14 mu m, and D90 is 23 mu m; the specific surface area of the hard carbon was 6m²(g), the hard carbon particle size distribution has a D10 of 3 μm, a D50 of 8 μm, and a D90 of 16 μm.

(2) Coating the lithium ion battery negative electrode slurry obtained in the step (1) on two auxiliary material surfaces of a copper foil with the thickness of 6 mu m and baking, wherein the surface density of the coated single surface is 90 +/-1 g/m²The density of the coated double-sided surface is 180 +/-2 g/m²。

(3) Rolling the negative plate obtained in the step (2) to obtain a rolled compact density of 1.57g/cm³。

(4) Deionized water is taken as a dispersant, and the mass percent is Al₂O₃(alumina): CMC (sodium carboxymethylcellulose): SBR (styrene butadiene rubber) = 85: 5: 10 are evenly stirred in a stirring device to obtain inorganic ceramic coating slurry, wherein Al is₂O₃(alumina) had a purity of 99.9992% and a specific surface area of 4 m²(ii)/g, the particle size distribution range is 200 to 600 nm. And (4) coating the inorganic ceramic coating slurry on the surfaces of the two auxiliary material layers of the rolled negative plate obtained in the step (3), and baking to obtain the negative plate with the inorganic ceramic coating of the lithium ion battery, wherein the thicknesses of the two inorganic ceramic coatings after drying are both 2 microns.

Example 4:

(1) deionized water is used as dispersantThe mass percentage of graphite: hard carbon: SP (conductive carbon black): CMC (sodium carboxymethylcellulose): SBR (styrene butadiene rubber) = 90.4: 5.0: 1.0: 1.6: and 2.0, uniformly stirring the components in a stirring device to obtain the lithium ion battery cathode slurry. Wherein the specific surface area of the graphite is 1.4 m²The particle size distribution of the graphite is that D10 is 5 mu m, D50 is 13 mu m, and D90 is 25 mu m; the specific surface area of the hard carbon was 4 m²(g), the hard carbon particle size distribution has a D10 of 3 μm, a D50 of 9 μm, and a D90 of 18 μm.

(2) Coating the lithium ion battery negative electrode slurry obtained in the step (1) on two auxiliary material surfaces of copper foil with the thickness of 8 mu m and baking, wherein the surface density of the coated single surface is 90 +/-1 g/m²The density of the coated double-sided surface is 180 +/-2 g/m²。

(3) Rolling the negative plate obtained in the step (2) to obtain a rolled compact density of 1.60g/cm³。

(4) Deionized water is taken as a dispersant, and the mass percent is Al₂O₃(alumina): CMC (sodium carboxymethylcellulose): SBR (styrene butadiene rubber) = 82: 6: 12 are evenly stirred in a stirring device to obtain inorganic ceramic coating slurry, wherein Al is₂O₃(alumina) had a purity of 99.9992% and a specific surface area of 4 m²(ii)/g, the particle size distribution range is 200 to 600 nm. And (4) coating the inorganic ceramic coating slurry on the surfaces of the two auxiliary material layers of the rolled negative plate obtained in the step (3), and baking to obtain the negative plate with the inorganic ceramic coating of the lithium ion battery, wherein the thicknesses of the two inorganic ceramic coatings after drying are both 2 microns.

Example 5:

(1) deionized water is used as a dispersing agent, and the mass percentage of graphite: hard carbon: SP (conductive carbon black): CMC (sodium carboxymethylcellulose): SBR (styrene butadiene rubber) = 90.4: 5.0: 1.0: 1.6: and 2.0, uniformly stirring the components in a stirring device to obtain the lithium ion battery cathode slurry. Wherein the specific surface area of the graphite is 1.4 m²The particle size distribution of the graphite is that D10 is 5 mu m, D50 is 13 mu m, and D90 is 25 mu m; the specific surface area of the hard carbon was 4 m²(g) hard carbon particle size distribution D10 is 3 μm, D50 is 9 μm, D90And 18 μm.

(2) Coating the lithium ion battery negative electrode slurry obtained in the step (1) on two auxiliary material surfaces of a copper foil with the thickness of 6 mu m and baking, wherein the surface density of the coated single surface is 90 +/-1 g/m²The density of the coated double-sided surface is 180 +/-2 g/m²。

(3) Rolling the negative plate obtained in the step (2) to obtain a rolled compact density of 1.57g/cm³。

(4) Deionized water is taken as a dispersant, and the mass percent is SiO₂(silica): CMC (sodium carboxymethylcellulose): SBR (styrene butadiene rubber) = 85: 5: 10 are evenly stirred in a stirring device to obtain inorganic ceramic coating slurry, wherein SiO is₂The purity of (silica) was 99.9994%, and the specific surface area was 4 m²(ii)/g, the particle size distribution range is 200 to 600 nm. And (4) coating the inorganic ceramic coating slurry on the surfaces of the two auxiliary material layers of the rolled negative plate obtained in the step (3), and baking to obtain the negative plate with the inorganic ceramic coating of the lithium ion battery, wherein the thicknesses of the two inorganic ceramic coatings after drying are both 2 microns.

Example 6:

(1) deionized water is used as a dispersing agent, and the mass percentage of graphite: hard carbon: SP (conductive carbon black): CMC (sodium carboxymethylcellulose): SBR (styrene butadiene rubber) = 90.4: 5.0: 1.0: 1.6: and 2.0, uniformly stirring the components in a stirring device to obtain the lithium ion battery cathode slurry. Wherein the specific surface area of the graphite is 1.4 m²The particle size distribution of the graphite is that D10 is 5 mu m, D50 is 13 mu m, and D90 is 25 mu m; the specific surface area of the hard carbon was 4 m²(g), the hard carbon particle size distribution has a D10 of 3 μm, a D50 of 9 μm, and a D90 of 18 μm.

(2) Coating the lithium ion battery negative electrode slurry obtained in the step (1) on two auxiliary material surfaces of a copper foil with the thickness of 6 mu m and baking, wherein the surface density of the coated single surface is 90 +/-1 g/m²The density of the coated double-sided surface is 180 +/-2 g/m²。

(3) Rolling the negative plate obtained in the step (2) to obtain a rolled compact density of 1.57g/cm³。

(4) Deionized water is used as a dispersant, andZrO in percentage by mass₂(zirconium dioxide): CMC (sodium carboxymethylcellulose): SBR (styrene butadiene rubber) = 85: 5: 10 are evenly stirred in a stirring device to obtain inorganic ceramic coating slurry, wherein ZrO in the slurry₂(zirconium dioxide) purity 99.9995%, specific surface area 4 m²(ii)/g, the particle size distribution range is 200 to 600 nm. And (4) coating the inorganic ceramic coating slurry on the surfaces of the two auxiliary material layers of the rolled negative plate obtained in the step (3), and baking to obtain the negative plate with the inorganic ceramic coating of the lithium ion battery, wherein the thicknesses of the two inorganic ceramic coatings after drying are both 2 microns.

Example 7:

(1) deionized water is used as a dispersing agent, and the mass percentage of graphite: hard carbon: SP (conductive carbon black): CMC (sodium carboxymethylcellulose): SBR (styrene butadiene rubber) = 90.4: 5.0: 1.0: 1.6: and 2.0, uniformly stirring the components in a stirring device to obtain the lithium ion battery cathode slurry. Wherein the specific surface area of the graphite is 1.4 m²The particle size distribution of the graphite is that D10 is 5 mu m, D50 is 13 mu m, and D90 is 25 mu m; the specific surface area of the hard carbon was 4 m²(g), the hard carbon particle size distribution has a D10 of 3 μm, a D50 of 9 μm, and a D90 of 18 μm.

(2) Coating the lithium ion battery negative electrode slurry obtained in the step (1) on two auxiliary material surfaces of copper foil with the thickness of 12 mu m and baking, wherein the surface density of the coated single surface is 106 +/-1 g/m²The density of the coated double-sided surface is 212 +/-2 g/m²。

(3) Rolling the negative plate obtained in the step (2) to obtain a rolled compact density of 1.62g/cm³。

(4) Deionized water is taken as a dispersant, and the mass percent is Al₂O₃(alumina): CMC (sodium carboxymethylcellulose): SBR (styrene butadiene rubber) = 85: 5: 10 are evenly stirred in a stirring device to obtain inorganic ceramic coating slurry, wherein Al is₂O₃(alumina) had a purity of 99.9996% and a specific surface area of 6m²(ii)/g, the particle size distribution range is 100 to 500 nm. Coating inorganic ceramic coating slurry on the surfaces of the two auxiliary material layers of the rolled negative plate obtained in the step (3) and then carrying outBaking to obtain the lithium ion battery inorganic ceramic coating negative plate, wherein the thicknesses of the two dried inorganic ceramic coatings are both 6 mu m.

Example 8:

(1) deionized water is used as a dispersing agent, and the mass percentage of graphite: hard carbon: SP (conductive carbon black): CMC (sodium carboxymethylcellulose): SBR (styrene butadiene rubber) = 84.5: 10.0: 1.5: 1.7: 2.3, uniformly stirring the components in a stirring device to obtain the lithium ion battery cathode slurry. Wherein the specific surface area of the graphite is 2.0m²The particle size distribution of the graphite is 8 mu m in D10, 12 mu m in D50 and 22 mu m in D90; the specific surface area of the hard carbon was 6m²(g), the hard carbon particle size distribution has a D10 of 3 μm, a D50 of 8 μm, and a D90 of 16 μm.

(2) Coating the lithium ion battery negative electrode slurry obtained in the step (1) on two auxiliary material surfaces of copper foil with the thickness of 8 mu m and baking, wherein the surface density of the coated single surface is 102 +/-1 g/m²The density of the coated double-sided surface is 204 +/-2 g/m²。

(3) Rolling the negative plate obtained in the step (2) to obtain a rolled compact density of 1.55g/cm³。

(4) Deionized water is taken as a dispersant, and the mass percent is Al₂O₃(alumina): CMC (sodium carboxymethylcellulose): SBR (styrene butadiene rubber) = 85: 5: 10 are evenly stirred in a stirring device to obtain inorganic ceramic coating slurry, wherein Al is₂O₃(alumina) had a purity of 99.9992% and a specific surface area of 4 m²(ii)/g, the particle size distribution range is 200 to 600 nm. And (4) coating the inorganic ceramic coating slurry on the surfaces of the two auxiliary material layers of the rolled negative plate obtained in the step (3), and baking to obtain the negative plate with the inorganic ceramic coating of the lithium ion battery, wherein the thicknesses of the two inorganic ceramic coatings after drying are both 12 microns.

Example 9:

(1) deionized water is used as a dispersing agent, and the mass percentage of graphite: hard carbon: SP (conductive carbon black): CMC (sodium carboxymethylcellulose): SBR (styrene butadiene rubber) = 90.4: 5.0: 1.0: 1.6: 2.0, stirring the components in a stirring device uniformly to obtain the lithium ion batteryAnd (4) negative electrode slurry. Wherein the specific surface area of the graphite is 1.4 m²The particle size distribution of the graphite is that D10 is 5 mu m, D50 is 13 mu m, and D90 is 25 mu m; the specific surface area of the hard carbon was 4 m²(g), the hard carbon particle size distribution has a D10 of 3 μm, a D50 of 9 μm, and a D90 of 18 μm.

(2) Coating the lithium ion battery negative electrode slurry obtained in the step (1) on two auxiliary material surfaces of a copper foil with the thickness of 6 mu m and baking, wherein the surface density of the coated single surface is 90 +/-1 g/m²The density of the coated double-sided surface is 180 +/-2 g/m²。

(3) Rolling the negative plate obtained in the step (2) to obtain a rolled compact density of 1.57g/cm³。

(4) Deionized water is taken as a dispersant, and the mass percent is Al₂O₃(alumina): SiO 2₂(silica): CMC (sodium carboxymethylcellulose): SBR (styrene butadiene rubber) = 50: 35: 5: 10 are evenly stirred in a stirring device to obtain inorganic ceramic coating slurry, wherein Al is₂O₃(alumina) had a purity of 99.9992% and a specific surface area of 4 m²(ii)/g, the particle size distribution range is 200-600 nm; SiO 2₂(silica) purity of 99.9999% and specific surface area of 6m²(ii)/g, the particle size distribution range is 100 to 400 nm. And (4) coating the inorganic ceramic coating slurry on the surfaces of the two auxiliary material layers of the rolled negative plate obtained in the step (3), and baking to obtain the negative plate with the inorganic ceramic coating of the lithium ion battery, wherein the thicknesses of the two inorganic ceramic coatings after drying are both 2 microns.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that any minor modifications, equivalent changes and modifications made to the above embodiment according to the technical spirit of the present invention are within the technical scope of the present invention.

Claims (5)

1. The lithium ion battery negative plate with the inorganic ceramic coating is characterized by comprising a current collector layer, two auxiliary material layers and two inorganic ceramic coatings, wherein the two auxiliary material layers are attached to the two auxiliary material surfaces of the current collector, and the two inorganic ceramic coatings are coated on the two auxiliary material layers.

2. The lithium ion battery inorganic ceramic coating negative plate and the manufacturing method thereof according to claim 1, wherein the thickness of the current collector is 6-25 μm, and the total surface density of the two auxiliary material layers is 40-240 g/m²And the total thickness of the two inorganic ceramic coatings is 2-36 mu m.

3. The lithium ion battery inorganic ceramic coating negative plate and the manufacturing method thereof according to claim 1, wherein the current collector is a copper foil; the auxiliary material layer contains active substances, a conductive agent, a thickening agent and a binder, wherein the active substances are graphite and hard carbon, the conductive agent is SP (conductive carbon black), the thickening agent is CMC (sodium carboxymethyl cellulose), the binder is SBR (styrene butadiene rubber), and the auxiliary material layer comprises the following substances in percentage by mass: 80-93% of graphite, 2-15% of hard carbon, 0.8-2.0% of SP (conductive carbon black), 1.5-1.9% of CMC (sodium carboxymethyl cellulose) and 1.5-2.5% of SBR (styrene butadiene rubber); the inorganic ceramic coating contains an inorganic ceramic material, a suspending agent and a binder, wherein the inorganic ceramic material is Al₂O₃(aluminum oxide) or SiO₂(silica) or ZrO₂(zirconium dioxide) one or more, wherein the suspending agent is CMC (sodium carboxymethylcellulose), the binder is SBR (styrene butadiene rubber), and the inorganic ceramic coating comprises the following substances in percentage by mass: 78-91% of inorganic ceramic material, 3-9% of CMC (sodium carboxymethyl cellulose) and 6-13% of SBR (styrene butadiene rubber).

4. The lithium ion battery inorganic ceramic coating negative electrode plate and the manufacturing method thereof according to claim 3, wherein the specific surface area of the active material graphite is 1-3 m²The particle size distribution D10 is 4-10 μm, D50 is 12-18 μm, and D90 is 20-35 μm; the specific surface area of the active substance hard carbon is 3-6 m²(g) D10 of particle size distribution of 2-6 μm, D507-12 μm, D90 is 14-22 μm; the purity of the inorganic ceramic material is more than 99.999 percent, and the specific surface area is 2-8 m²(ii)/g, the particle size distribution range is 50 to 900 nm.

5. The inorganic ceramic coating negative plate of the lithium ion battery and the manufacturing method thereof according to claim 1, wherein the manufacturing method comprises the following steps:

(1) uniformly stirring graphite, hard carbon, SP (conductive carbon black), CMC (sodium carboxymethyl cellulose) and SBR (styrene butadiene rubber) in stirring equipment by taking deionized water as a dispersing agent to obtain lithium ion battery cathode slurry;

(2) coating the lithium ion battery negative electrode slurry obtained in the step (1) on two auxiliary material surfaces of a current collector and baking;

(3) rolling the negative plate obtained in the step (2), wherein the rolling compaction density is 1.4-1.8 g/cm³；

(4) And (3) taking deionized water as a dispersing agent, uniformly stirring the inorganic ceramic material, CMC (sodium carboxymethylcellulose) and SBR (styrene butadiene rubber) in stirring equipment to obtain inorganic ceramic coating slurry, coating the inorganic ceramic coating slurry on the surfaces of the two auxiliary material layers of the rolled negative plate obtained in the step (3), and baking to obtain the lithium ion battery inorganic ceramic coating negative plate.