COMPOSITE CATHODE MATERIAL Russian patent published in 2013 - IPC H01M4/52 H01M10/525 

FIELD: electricity.

SUBSTANCE: disclosed is a composite cathode material consisting of a mechanical mixture of nanocrystals of lithium-iron phosphate (LiFePO₄) and a phosphate with a Nasicon structure, specifically: either a double phosphate of the composition Li_xM₂(PO₄)₃, where: x=1 for M=Ti^lv, Zr^lv; x=3 for M=In^III, Cr^III, Fe^III; or a composite phosphate of the composition Li_1+yM^IV _2-yM^III _y(PO₄)₃, where: ; M^lv=Ti^IV Zr^lv; M^III=In^III, Cr^III, Fe^III; wherein the mixture is coated with carbon, with the following ratios of components, wt %: lithium - iron phasphate 82÷98; phosphate with a Nasicon structure 1÷15; carbon 1-6, wherein the size of lithium-iron phosphate crystals ranges from 20 to 100 nm, the size of crystals of the phosphate with a Nasicon structure ranges from 20 to 200 nm, thickness of the carbon coating ranges from 1 to 5 nm.

EFFECT: composite material significantly increases concentration of defects on the phase boundary and increases ion conductivity thereof.

4 dwg, 1 tbl