| 摘要 |
Active material is obtained by sintering a precursor, has a layered structure and is represented by the following formula (1). The temperature at which the precursor becomes a layered structure compound in its sintering in atmospheric air is 450° C. or less. Alternatively, the endothermic peak temperature of the precursor when its temperature is increased from 300° C. to 800° C. in its differential thermal analysis in the atmospheric air is 550° C. or less. LiyNiaCobMncMdOxFz(1) In formula (1), the element M is at least one of Al, Si, Zr, Ti, Fe, Mg, Nb, Ba, and V and 1.9@(a+b+c+d+y)@2.1, 1.0@y@1.3, 0<a@0.3, 0@b@0.25, 0.3@c@0.7, 0@d@0.1, 1.9@(x+z)@2.0, and 0@z@0.15 are satisfied.
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