METHOD FOR PRODUCING LITHIUM-CONTAINING COMPOSITE OXIDE

摘要

A method for producing a lithium-containing composite oxide is represented by general formula (1), the method at least comprising the steps of preparing a solution by dissolving a lithium source, an element M source, a phosphorus source, and an element X source that serve as source materials in a solvent, the phosphorus source being added after at least the element M source is dissolved; gelating the resulting solution; and calcining the resulting gel: Li x M y P1-z X z O4 (1) (where M represents at least one of Fe, Ni, Mn, Zr, Sn, Al, and Y; X represents at least one of Si and Al; and 0 < x <= 2, 0.8 <= y <= 1.2, 0 <= z <= 1). Accordingly, a positive electrode active material for lithium secondary batteries that offers high safety and high cost efficiency and are capable of extending battery life can be provided.