| 摘要 |
In a lithium secondary battery of this invention, either a positive electrode or a negative electrode includes, as an active material, an orthorhombic composite oxide represented by a composition formula, MxMo1-xOy, wherein M is at least one transition element selected from the group consisting of Cu, V, Mn, Fe, Co and Ni; 0<x<=0.46; and 2.6<=y<=3.1, or a composition formula, MxNb2-xOy, wherein M is at least one transition element selected from the group consisting of V, Cr, Mo, W. Mn and Fe; 0<x<=0.6; and 4.7<=y<=5.3, or an orthorhombic lithium-containing composite oxide obtained by incorporating lithium into the orthorhombic composite oxide. Thus, the lithium secondary battery can exhibit better charge-discharge cycle performance than a lithium secondary battery using MoO3 or Nb2O5 as an active material.
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