Nonaqueous electrolyte secondary battery

A non-aqueous electrolyte secondary battery comprising a positive electrode, a negative electrode, and a non-aqueous electrolyte, wherein

• the negative electrode includes a negative electrode core and a negative electrode mixture layer formed on at least one surface of the negative electrode core,
• a ratio (E1/E2) of a charge expansion ratio (E1) to a discharge expansion ratio (E2) of the negative electrode is greater than or equal to 1.05 and less than 1.15, and, in the negative electrode mixture layer, a content of silicon material relative to a mass of negative electrode active material is greater than or equal to 3 mass % and less than or equal to 12 mass %, as the negative electrode active material, the negative electrode mixture layer contains:
• graphite;
• a first silicon material (SiO) containing a silicon oxide phase and Si dispersed in the silicon oxide phase;
• and a second silicon material (LSX) containing a lithium silicate phase and Si dispersed in the lithium silicate phase, and
• a ratio of a mass of the LSX to a mass of the SiO is greater than or equal to 0.2 and less than or equal to 6.