| 摘要 |
An object of the present invention is to provide a lithium secondary battery which has improved capacity, durability, and rate characteristic as compared with conventional lithium secondary batteries. A plate-like particle or a film for a lithium secondary battery cathode active material is represented by the following general formula: General formula: Lip(Nix,Coy,Alz)O2 (wherein 0.9≦̸p≦̸1.3, 0.6<x≦̸0.9, 0.1<y≦̸0.3, 0≦̸z≦̸0.2, x+y+z=1) The particle or the film contains cobalt and lithium and has a layered rock salt structure. The (003) plane is oriented so as to intersect the plate surface of the particle or film.
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