Patent ID: 7837900

Claim:
An electrode material comprising an alloy having a Gd 3 Ni 8 Sn 16 type crystal structure, wherein the alloy has a composition represented by following formula (1): Li z Ln 3 M1 x M2 y (1) where Ln is at least one of elements having atom radius in a range of 1.6×10 −10 m or more and 2.2×10 −10 m or less; M1 is at least one element selected from the group consisting of Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn and Nb; M2 is at least one element selected from the group consisting of P, Si, Ge, Sn and Sb; and x, y and z are atomic ratios wherein 7.5≦x≦8.5, 15.5≦y≦16.5, and 0<z 3.0.