Sumitomo Electric Industries, Limited

Hiryoyuki Ueki

Nobuhiro Ota

Nobuyuki Okuda

Tomohiko Ihara

Affords high-stability, high-safety lithium secondary batteries of high energy density and superlative charge/discharge cyclability, in which shorting due to the growth of dendrites from the metallic-lithium negative electrode is kept under control. A lithium secondary battery negative-electrode component material, formed by laminating onto a substrate a metallic lithium film and an inorganic solid-electrolyte film, the lithium secondary battery negative-electrode component material characterized in that the inorganic solid-electrolyte film incorporates lithium, phosphorous, sulfur, and oxygen, and is represented by the compositional formula noted below.aLi&#xb7;bP&#xb7;cS&#xb7;dO (Li: lithium; P: phosphorous; S: sulfur; O: oxygen), wherein the ranges of the atomic fractions in the composition are:0.20&#x2266;a&#x2266;0.45;0.10&#x2266;b&#x2266;0.20;0.35&#x2266;c&#x2266;0.60;0.03&#x2266;d&#x2266;0.13;(=1).

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Itami, Japan

Hiryoyuki Ueki