NEGATIVE ELECTRODE FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY, NONAQUEOUS ELECTROLYTE SECONDARY BATTERY, AND BATTERY PACK

摘要

A negative electrode for nonaqueous electrolyte secondary battery of an embodiment includes a current collector, and a negative electrode mixture layer arranged on the current collector. The negative electrode mixture layer includes a negative electrode active material, a conductive material, and a binder. The negative electrode active material is composite particles including a carbonaceous substance, a silicon oxide phase in the carbonaceous substance, and a silicon phase including crystalline silicon in the silicon oxide phase. The negative electrode active material satisfies d1/d0≧0.9 where an average thickness of the mixture layer is d0, and a maximum thickness of a single particle of the composite particles in a vertical direction, the particle occupying the mixture layer, to a surface of the current collector is d1.

主权项

1. A negative electrode for nonaqueous electrolyte secondary battery, the negative electrode comprising:
a current collector; and a negative electrode mixture layer arranged on the current collector, and including a negative electrode active material, a conductive material, and a binder, wherein the negative electrode active material is composite particles including a carbonaceous substance, a silicon oxide phase in the carbonaceous substance, and a silicon phase including crystalline silicon in the silicon oxide phase, and the negative electrode active material satisfies d1/d0≧0.9 where an average thickness of the mixture layer is d0, and a maximum thickness of a single particle of the composite particles in a vertical direction, the particle occupying the mixture layer, to a surface of the current collector is d1.