| 摘要 |
In a lithium secondary battery of this invention, an active material of either a positive electrode or a negative electrode includes a composite sulfide having the same crystal structure as MoS2 or Mo2S3, or the composite sulfide including lithium, and the composite sulfide is represented by a composition formula, MXMo1-XSY, wherein M is at least one element selected from the group consisting of Cu, V, Cr, Mn, Fe, Co, Ni, Ti, Y, Cd, In, La, Ce, Pr, Nd, Sm, W, Pt, Pb, Ca, Sr and Ba; 0<X<0.46; and 1.5<=Y<=2.0. Thus, the lithium secondary battery using a molybdenum composite sulfide as an active material of a positive or negative electrode can attain good charge-discharge cycle performance.
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