Patent ID: 9508990
Filing Date: 2016-11-29
CPC Classification: C22C,H01M,Y02E

Claim Text:
1. A Si-based alloy anode material for lithium ion secondary batteries, comprising an alloy phase composed of a Si principal phase comprising Si and a compound phase consisting of two or more elements, wherein the two or more elements comprise a first additional element A being at least one selected from the group consisting of Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zr, Nb and Mg and a low-melting second additional element B being at least one selected from the group consisting of S, Se, Te, Sn, In, Ga, Pb, Bi, Zn, and Al, wherein the compound phase consists of: a first compound phase comprising Si and the first additional element A; a second compound phase comprising the first additional element A and the second additional element B; and one or both of a third compound phase comprising two or more of the second additional elements B and a single phase of the second additional element B, or, alternatively, consists of: a compound phase comprising Si and the first additional element A; and a compound phase comprising two or more of the second additional elements B and optionally a single phase of the second additional element B, and wherein the Si principal phase has an average minor axis width of 4 μm or less.