| 摘要 |
A cathodic active material according to the present invention has a composition represented by general formula (1): Li(1-a)AaFe(1-x-b)M(x-c)P(1-y)SiyO4 (1), where A is at least one type of element selected from the group consisting of Na, K, Fe, and M; Fe has an average valence of +2 or more; M is an element having a valence of +2 or more and at least one type of element selected from the group consisting of Zr, Sn, Y, and Al, the average valence of M being different from the average valence of Fe; 0<a≰0.125; a=b+c+d, where b is the number of moles of Fe in A, c is the number of moles of M in A, and d is the total number of moles of Na and K in A; 0<x≰0.5; and 0<y≰0.5. This makes it possible to realize a cathodic active material that not only excels in terms of safety and cost but also can provide a long-life battery.
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