CATHODE ACTIVE MATERIAL CONTAINING LITHIUM, CATHODE CONTAINING LITHIUM, AND NONAQUEOUS SECONDARY BATTERY CONTAINING LITHIUM

摘要

A nonaqueous secondary battery of the present invention isa nonaqueous secondary battery, comprising: a cathodeincluding a cathode active material; an anode; an electrolyte;and a separator, the cathode active material having acomposition represented by General Formula (1) below,LiFe1-a M x P1-y Siy O4 ... (1)where: an average valence of Fe is +2 or more; M is anelement having a valence of +2 or more and is at least onetype of element selected from the group consisting of Zr, Sn,Y, and Al; the valence of M is different from the averagevalence of Fe; 0 x = 0.5; and 0 y = 1.0, the cathode activematerial having, in a case where the nonaqueous secondarybattery has a voltage of 3.9 V or higher, a compositionrepresented by General Formula (2) below,Li x Fe1-x M x P1-y Si y O4 ... (2).