NEGATIVE ELECTRODE FOR ELECTRICAL DEVICE, AND ELECTRICAL DEVICE USING SAME

WIPO Patent Application WO/2014/080886

A1

[Problem] To provide a negative electrode for an electrical device such as a Li ion secondary battery, the electrode exhibiting a good balance of characteristics such as high initial capacity and maintaining high cycle characteristics. [Solution] A negative electrode for an electrical device, the electrode comprising a collector, and an electrode layer having a binder, a conduction auxiliary and negative electrode active material disposed on the surface of the collector, wherein the negative electrode active material contains an alloy represented by formula (1): SixSnyMzAa, and the elastic extension of the collector is at least 1.30%. (In formula (1), M is at least one metal selected from the group consisting of Al, V, C and combinations of the same, A is unavoidable impurities, x, y, z, and a represent mass% values, with 0