Negative electrode material, lithium secondary battery, and method for producing negative electrode material

The principal purpose of the present invention is to provide a negative electrode material capable of improving the cycle characteristics of lithium secondary batteries. The problem in the present invention is solved by providing a negative electrode material characterized by comprising the product of a reaction between a polymer compound having an acid group in a side chain, and a metal oxide represented by general formula M x O y (M being a metal) or a metal represented by general formula M, which cause an alloying reaction or a conversion reaction with Li.