| 摘要 |
In a lithium secondary battery provided with a positive electrode, a negative electrode, and a non-aqueous electrolyte, a tungsten oxide W20O58 or W18O49, or the tungsten oxide to which lithium is added, or a tungsten composite oxide comprising a tungsten oxide containing at least one type of metal element selected from the group consisting of Mn, Cu, V, Cr, Fe, Co, and Ni and having a W20O58-type or W18O49-type crystal structure or the tungsten composite oxide to which lithium is added is used as a positive electrode active material for said positive electrode or a negative electrode active material for said negative electrode.
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