NONAQUEOUS-ELECTROLYTE SECONDARY-BATTERY NEGATIVE ELECTRODE

摘要

A negative electrode for nonaqueous electrolyte secondary batteries which suppresses generation of gas and increases power characteristics, including a negative electrode current collector and a negative electrode mixture layer placed on the negative electrode current collector. The negative electrode mixture layer is a mixture of a negative electrode active material, a binding agent, and a conductive agent. The negative electrode active material contains silicon. The binding agent includes a binding agent A made of a rubber polymeric compound. A through-thickness cross section of the negative electrode mixture layer halved into a current collector-side region and a surface-side region, has the amount of the binding agent A in the current collector-side region larger than the amount of the binding agent A in the surface-side region and the amount of the conductive agent in the surface-side region is larger than the amount of the conductive agent in the current collector-side region.

主权项

1. A negative electrode for nonaqueous electrolyte secondary batteries, comprising a negative electrode current collector and a negative electrode mixture layer placed on the negative electrode current collector,
wherein the negative electrode mixture layer is a layer of a mixture of a negative electrode active material, a binding agent, and a conductive agent; the negative electrode active material contains silicon; the binding agent includes a binding agent A made of a rubber polymeric compound; and in the case where a through-thickness cross section of the negative electrode mixture layer is halved into a current collector-side region and a surface-side region, the amount of the binding agent A in the current collector-side region and the amount of the conductive agent in the surface-side region are larger than the amount of the binding agent A in the surface-side region and the amount of the conductive agent in the current collector-side region, respectively.