NOVELTY - Lithium secondary battery comprises: a positive electrode comprising a positive electrode current collector and a positive electrode mixture layer including a positive electrode binder and a positive electrode active material containing particles of a lithium transition metal composite oxide (A); a negative electrode including a negative electrode active material containing silicon particles and/or silicon alloy particles; a separator disposed between the positive electrode and the negative electrode; a battery case; and a non-aqueous electrolyte.    USE - The lithium secondary battery is useful in driving power supplies of mobile information terminals such as mobile phones, notebook personal computers, and personal digital assistants, and in applications in which the operating environment of a battery is severe, e.g., hybrid electric vehicles and electric tools.    ADVANTAGE - The lithium-containing oxide has a carbon-dioxide gas-absorbing capability, hence degradation of the negative electrode active material composed of silicon particles is suppressed. The lithium-containing oxide adheres to the surfaces of the particles of the lithium transition metal composite oxide, hence side reactions between the positive electrode active material and a non-aqueous electrolyte solution is suppressed. The battery has significantly improved charge-discharge cycle characteristics.    DETAILED DESCRIPTION - Lithium secondary battery comprises: a positive electrode comprising a positive electrode current collector and a positive electrode mixture layer including a positive electrode binder and a positive electrode active material containing particles of a lithium transition metal composite oxide of formula (LiaNi1-b-cCobAlcO2) (A) disposed on a surface of the positive electrode current collector; a negative electrode including a negative electrode active material containing silicon particles and/or silicon alloy particles; a separator disposed between the positive electrode and the negative electrode; a battery case; and a non-aqueous electrolyte, where the positive electrode, the negative electrode, and the separator constitutes an electrode body that is disposed in the battery case, and a lithium-containing oxide having a carbon-dioxide-gas-absorbing capability is adhered to surfaces of the particles of (A).    a = greater than 0 and less than or equal to 1.1;    b = 0.1-0.3; and    c = 0.03-0.10.