Method for producing lithium-containing composite oxide

Abstract

The present invention provides a method for producing a lithium-containing composite oxide represented by general formula (1) below, the method at least including a step 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; a step of gelating the resulting solution; and a step of calcining the resulting gel: LixMyP1-zXzO4  (1) (where M represents at least one element selected from the group consisting of Fe, Ni, Mn, Zr, Sn, Al, and Y; X represents at least one element selected from the group consisting of Si and Al; and 0<x≦2, 0.8≦y≦1.2, 0≦z≦1). According to the present invention, 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.

Dependencies are inferred from the claim text.