METHOD OF OBTAINING NANOCRYSTALLINE COMPOSITE CATHODE MATERIALS LiFeMSiO/C Russian patent published in 2014 - IPC H01M4/58 

FIELD: chemistry.

SUBSTANCE: method of obtaining nanocrystalline composite cathode materials Li_xFe_yM_zSiO₄/C consists in the following: as initial components selected are SiO₂, or titanomagnetite and SiO₂, in different amounts, which are mixed with carbonate Li(Li₂CO₃) in a ratio of 55-70 mol.% of initial ones, the remaining Li₂CO₃ and FeCO₃ being in equal amounts. The powder is melted at a temperature of 1180-1280°C, and an alloy is cooled until an amorphous structure is formed. Milling takes place until a two-phase structure, consisting of amorphous and crystalline (Li₂FeSiO₄) phases, is formed. Milling of the amorphous alloy is performed with highly-molecular compound of polymethylmethacrylate (PMMA) or soot in an amount from 2 to 5% of the alloy. After that, it is heated to a temperature of ≤600°C, combining in heating with modification of the powder surface by carbon, stood for 30-60 minutes, after which cooled to room temperature.

EFFECT: fast and cheap obtaining nanocrystalline composite cathode materials, which provide increase of the specific discharge capacity of an accumulator.

3 dwg, 10 ex