NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY

A non-aqueous electrolyte secondary battery with a negative electrode active material including a carbon material, and a silicon-containing material in which Si particles are dispersed in a lithium ion conductive phase. The negative electrode material mixture layer having a thickness Tincludes a first region on the negative electrode surface side having a thickness of T, and a second region on the negative electrode current collector side, and the ratio T/Tis 1/20 to 19/20. The ratio of a mass ratio Mof the silicon-containing material in the first region to a mass ratio Mof the silicon-containing material in the second region is not less than 0 and less than 1. An open circuit potential of the negative electrode in a fully charged condition is higher than 0 mV and 70 mV or lower relative to lithium metal.