NEGATIVE ELECTRODE FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY, MANUFACTURING METHOD THEREFOR AND NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte secondary battery in which cycle characteristics can be enhanced by minimizing degradation in collection performance of SiOeven in the end of discharge.SOLUTION: A nonaqueous electrolyte secondary battery comprises: a negative electrode mixture layer including a negative electrode active material containing SiO(0.8≤x≤1.2) and graphite, a dispersant, and a binder; and a negative electrode collector having the negative electrode mixture layer formed on at least one surface. Dispersant coverage factor Rof SiOshown in equation (1), and dispersant coverage factor Rof graphite shown in equation (2) satisfy a relation R>R. Dispersant coverage factor Rof SiO=(mass of dispersant covering SiO)/(mass of SiO)...(1), Dispersant coverage factor Rof graphite=(mass of dispersant covering graphite)/(mass of graphite)...(2).