Patent ID: 7632607

Claim:
A negative electrode for a battery, the negative electrode comprising: a collector; an active material layer provided on the collector, the active material layer including at least one kind of matter in a group consisting of an elementary substance of tin, an elementary substance of silicon, an alloy including at least one of tin and silicon, and a compound including at least one of tin and silicon; and an inorganic compound layer provided on the active material layer, the inorganic compound layer having a chemical composition expressed by general formula (I) described below, and having lithium ion conductivity. Li x PT y O z (1) wherein component T is at least one kind of element selected from an element group consisting of element symbols Ti, Cu, Zr, Mo, Ta, and W, and additionally x, y, and z satisfy 2.0≦x≦7.0, 0.01≦y≦1.0, and 3.5≦z≦8.0, respectively.