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Abstract

A non-aqueous secondary battery comprises a positive electrode-active material, a negative electrode material and a non-aqueous electrolyte, wherein an electrode mixture for positive electrode containing the positive electrode-active material comprises a compound in which anions can be inserted at a voltage of not less than 3.9 V (with respect to an Li.sup.+ /Li electrode). Moreover, the electrode mixture for positive electrode may further comprise at least one member selected from the group consisting of transition metals, elements of Group IIIB and IVB (except for C) and carbides thereof. The non-aqueous secondary battery can ensure safety against any overcharge and has a high discharge voltage. Moreover, the non-aqueous secondary battery permits increase in the charge capacity and discharge capacity without using any lithium compound in the electrode mixture for positive electrode, the reduction of the amount of the positive electrode-active material to be used and the improvement in the energy density of the resulting battery per unit volume.

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