ACTIVE CATHODE MATERIAL PROVIDING IMPROVED EFFICIENCY AND ENERGY DENSITY OF ELECTRODE Russian patent published in 2012 - IPC H01M4/58 B82B1/00 

FIELD: physics.

SUBSTANCE: invention relates to an active material for a positive electrode, having a composition of formula LiFe(P_1-xO₄), where P has molar ratio from 0.910 to 0.999. The disclosed active material for a positive electrode has operational efficiency levelled to operational efficiency of active material of a negative electrode, which is relatively low, which improves energy density of the active material of the positive electrode. The Fe²⁺ and Fe³⁺ ions contained in the disclosed material prevent structure destruction caused by shortage of phosphorus (P), resulting in improvement of ion conduction of the material and achieving excellent current properties and inhibiting voltage drop on the active resistance during charging/discharging, thus improving energy density.

EFFECT: material is obtained using a supercritical hydrothermal method and can be used in cathode material for lithium secondary batteries.

21 cl, 4 dwg, 2 ex