Method for reducing residual alkali of layered oxide positive electrode material

Abstract

The invention discloses a method for reducing residual alkali of a layered oxide positive electrode material, and belongs to the field of energy materials and energy storage. In the sintering process, conventional constant-temperature solid-phase sintering is broken, sintering tail end variable-temperature sintering is adopted, a rapid heating section is introduced, residual alkali on the surface of the layered oxide material is volatilized, the crystallinity of the material is further improved, and therefore the electrochemical performance and structural stability of the positive electrode material are improved. The 0.1 C first-circle discharge capacity is increased from 134 mAh / g to 137 mAh / g, the 1C discharge capacity is increased from 119 mAh / g to 125 mAh / g, and the 50-cycle cycle retention rate is increased from 75% to 90%).

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