Positive electrode active material for nonaqueous electrolyte secondary battery, method for producing the same, positive electrode for nonaqueous electolyte

摘要

An object of the present invention is to provide a positive electrode active material for a nonaqueous electrolyte secondary battery etc. which are capable of suppressing the generation of gas during charge by suppressing a reaction between a positive electrode and an electrolyte decomposition product moved from a negative electrode and a reaction between the positive electrode and the electrolyte, and which are thereby capable of significantly improving battery characteristics such as cycling characteristics. The positive electrode active material includes a compound composed of sodium, fluorine, and erbium and adhered to a surface of lithium cobalt oxide, and can be produced by adding, while adjusting pH, an aqueous solution prepared by dissolving erbium nitrate pentahydrate to a suspension containing lithium cobalt oxide and sodium fluoride.

主权项

1. A positive electrode active material for a nonaqueous electrolyte secondary battery, the positive electrode active material comprising a lithium transition metal composite oxide and a compound composed of an alkali metal element, a fluorine element, and a rare earth element, wherein the compound is mainly present on a surface of the lithium transition metal composite oxide, and
wherein the compound composed of an alkali metal element, a fluorine element, and a rare earth element has an average particle diameter of 1 nm or more and 100 nm or less.