NEGATIVE ELECTRODE ACTIVE MATERIAL, MIXED NEGATIVE ELECTRODE ACTIVE MATERIAL MATERIAL, NEGATIVE ELECTRODE FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY, LITHIUM ION SECONDARY BATTERY, METHOD FOR MANUFACTURING NEGATIVE ELECTRODE ACTIVE MATERIAL, AND METHOD FOR MANUFACTURING LITHIUM ION SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a negative electrode active material which can enhance initial charge and discharge characteristics and cycle characteristics when used as a negative electrode active material of a secondary battery.SOLUTION: A negative electrode active material comprises negative electrode active material particles. The negative electrode active material particles include silicon compound particles containing a silicon compound (SiO: 0.5≤x≤1.6). The silicon compound particles contain lithium. The negative electrode active material particles contain a carbon material in a surface layer portion thereof. When added to an ion exchanged water of 1 μS/cm or less in conductivity, 80 mass% or more of the total mass of the added negative electrode active material particles precipitate in the ion exchanged water.SELECTED DRAWING: Figure 1