SURFACE COATING METHOD AND A METHOD FOR REDUCING IRREVERSIBLE CAPACITY LOSS OF A LITHIUM RICH TRANSITIONAL OXIDE ELECTRODE

摘要

A surface coating method and a method for reducing irreversible capacity loss of a lithium rich transitional oxide electrode are disclosed herein. In an example of the surface coating method, a dispersion of a lithium rich transitional oxide powder and an oxide precursor or a phosphate precursor in a liquid is formed. The liquid is evaporated. The forming and evaporating steps are carried out in the absence of air to prevent precipitation of the oxide precursor or the phosphate precursor. Hydrolyzation of the oxide precursor or the phosphate precursor is controlled under predetermined conditions, and an intermediate product is formed. The intermediate product is annealed to form an oxide coated lithium rich transitional oxide powder or the phosphate coated lithium rich transitional oxide powder.

主权项

1. A surface coating method, comprising:
forming a dispersion of a lithium rich transitional oxide powder and an oxide precursor or a phosphate precursor in a liquid; evaporating the liquid; carrying out the forming and the evaporating steps in the absence of air to prevent precipitation of the oxide precursor or the phosphate precursor; controlling hydrolyzation of the oxide precursor or the phosphate precursor under predetermined conditions, thereby forming an intermediate product; and annealing the intermediate product to form an oxide coated lithium rich transitional oxide powder or an phosphate coated lithium rich transitional oxide powder.