ANODE MATERIAL FOR LITHIUM ELECTROLYTIC CELL AND METHOD OF PREPARING SAID MATERIAL Russian patent published in 2010 - IPC H01M4/485 

FIELD: chemistry.

SUBSTANCE: anode material based on a lithium-titanium spinel contains doping components - chromium and vanadium in equivalent amounts, having chemical formula Li₄Ti_5-2y(Cr_yV_y)O_12-x, where x is stoichiometric deviation in the range 0.02<x<0.5, y is the stoichiometric coefficient in the range 0<y<0.1. The method of preparing the anode material involves preparation of a mixture of initial components which contain lithium and titanium and sources of doping chromium and vanadium through homogenisation and grinding, which is carried out until obtaining particles with size not greater than 0.5 mcm, and subsequent step by step thermal treatment with a prepared mixture in a controlled atmosphere of inert argon and reducing acetylene in the ratio of gases in the argon stream: acetylene between 999:1 and 750:250 respectively using the following procedure: at the first step the mixture of components is heated to temperature which is not above 350°C; at the second step heating is continued in the range 350-750°C at a rate of not more than 10°C/min, which enables solid-phase interaction of components; at the third step temperature is raised to 840-850°C and the obtained product is kept at this temperature for not less than 1 hour; at the fourth step temperature is lowered to 520-580°C at a rate of 5°C/min and the obtained anode material is kept at this temperature for not less than 2 hours; at the final step the ready anode material is blown with pure argon while cooling to 40-60°C and then packed.

EFFECT: high electrochemical capacitance (165±5 mA-h/g), high electron conductivity (2·10^-2 Ohm^-1·cm^-1), obtaining anode material from readily available components using conventional equipment.

2 cl, 1 tbl