Lithium secondary battery having positive electrode active material including lithium transition met

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A lithium secondary battery has a positive electrode (1) containing a positive electrode active material having particles of lithium cobalt oxide, a negative electrode (2) containing a negative electrode active material having silicon particles, a separator interposed between the positive electrode (1) and the negative electrode (2), and a non-aqueous electrolyte. Particles of erbium hydroxide or erbium oxyhydroxide are adhered to a surface of the lithium cobalt oxide particles in a dispersed form.