METHOD OF PRODUCING ACTIVE MATERIAL OF CATHODE BASED ON LITHIUM ENRICHED PHOSPHATE LIFEPO WITH OLIVINE STRUCTURE, ELECTRODE MASS AND CATHODE OF LITHIUM-ION BATTERY Russian patent published in 2020 - IPC H01M4/58 H01M10/525 

FIELD: chemistry.

SUBSTANCE: invention relates to electrode materials based on complex phosphates of transition metals and lithium and can be used to produce cathode active material for lithium-ion batteries and batteries based on such material. Method of producing active material for cathode of lithium-ion battery, having formula Li_1+xFe_1-yPO₄, where 0<x, y<0.1, characterized by olivine structure, includes the following steps: a) obtaining Li_3-zNa_zPO₄ particles (0≤z<2) by precipitation from a solution obtained by dissolving sources of Li⁺ ions or Li⁺ and Na⁺ sources in water, followed by addition of ion sources PO₄^3- and organic cosolvent, which is monoatomic and/or polyatomic alcohols, containing 2–8 carbon atoms, with content of co-solvent in reaction mixture of said components of 20–80 wt%; b) mixing sources of Fe²⁺ cations with particles of Li_3-zNa_zPO₄ (0≤z<2) at their molar ratio of 0.9:1 to 1.1:1, respectively, with subsequent mixing of obtained mixture in atmosphere of inert gas in sealed autoclave at temperature in range of 190–210 °C for at least 1 hour. Method further comprises mixing the compound obtained in the autoclave with a carbon source and subsequent annealing at 600–700 °C for at least 1 hour an inert gas atmosphere.

EFFECT: technical result of the invention consists in economical and scalable production of cathode material, characterized by high specific power consumption during cycling at medium and high cycling speeds (more than 1C) and stability of operating characteristics during long-term operation.

17 cl, 9 dwg, 3 ex, 1 tbl