POSITIVE ELECTRODE ACTIVE SUBSTANCE, POSITIVE ELECTRODE FOR NONAQUEOUS ELECTROLYTE SECONDARY CELL, NONAQUEOUS ELECTROLYTE SECONDARY CELL, AND METHOD FOR PRODUCING POSITIVE ELECTRODE ACTIVE SUBSTANCE

摘要

A positive electrode active substance (1) that is used is characterized in that particles (5) containing iron or iron carbide are added to a manganese-doped lithium iron silicate (3) represented by general formula Li2Fe1-xMnxSiO4 (0.25 < x < 1). The method for producing the positive electrode active substance is characterized by comprising the following: a step (a) for synthesizing precursor particles using a lithium source, an iron source, a manganese source, and a silicon source; a step (b) for mixing a carbon source in the precursor particles; and a step (c) for calcining the precursor particles mixed with the carbon source under an inert atmosphere. Preferably the positive electrode active substance is carbon-coated by annealing under a hydrocarbon gas atmosphere.