Method for manufacturing negative electrode active material, mixed negative electrode active material, aqueous negative electrode slurry composition, and negative electrode active material

摘要

A negative electrode active material for nonaqueous electrolyte secondary batteries, which contains a phosphoric acid salt and negative electrode active material particles that contain silicon compound particles containing a silicon compound (SiOx wherein 0.5≤x≤1.6), said silicon compound particles containing at least one of Li2SiO3 and Li2Si2O5, and which is configured such that: the negative electrode active material particles contain lithium element in the surfaces; and the ratio of the molar quantity mp of the phosphorus element contained in unit mass of the negative electrode active material particles to the molar quantity ml of the lithium element contained in unit mass of the negative electrode active material particles and present in the surfaces of the negative electrode active material particles satisfies the relational expression 0.02 ≤ mp/ml ≤3. Consequently, this negative electrode active material for nonaqueous electrolyte secondary batteries is able to stabilize an aqueous negative electrode slurry, and is capable of improving the initial charge and discharge characteristics if used as a negative electrode active material of a secondary battery.