Patent ID: 7416815

Claim:
A lithium secondary battery negative-electrode component material formed by laminating onto a substrate a metallic lithium film and an inorganic solid-electrolyte film, said metallic lithium film incorporating oxygen in an amount that is 1 atomic % or more, but 10 atomic % or less, and said inorganic solid-electrolyte film incorporating lithium, phosphorous, sulfur, and oxygen, in a composition represented by the compositional formula: aLi·bP·cS·dO (Li: lithium; P: phosphorous; S: sulfur; O: oxygen), wherein the ranges of the atomic fractions in the composition are: 0.20≦a≦0.45; 0.10≦b≦0.20; 0.35≦c≦0.60; 0.03≦d≦0.13; ( a+b+c+d= 1).