Titanium nitride chloride, obtained by ammonolysis of the corresponding tetrachloride, has been examined as an electrode for rechargeable lithium batteries. Electrochemical lithium intercalation in both amorphous and crystalline TiNCl has been performed, leading to new materials of composition The maximum lithium uptake in amorphous TiNCl reaches rather high values that depend upon the experimental conditions. At a current density of 0.1 mA cm⁻², a maximum quantity of 1.5 Li reacts with TiNCl between 3 and 0.5 V. However, reversibility of the electrochemical reduction with lithium is only obtained when cells are discharged to 1.2 V, for which the composition is achieved. A good cycling behavior occurs when cells are cycled between 3 and 1.2 V, because the first cycle discharge capacity (160 Ah kg⁻¹) is fairly maintained. Performances of crystalline TiNCl are very similar to the observed ones for the amorphous compound. However, for the crystalline material, intercalates are formed through several well-defined electrochemical processes. © 2004 The Electrochemical Society. All rights reserved.