| abstract |
[PROBLEMS] To provide an active material for a non-aqueous secondary battery, a method for producing the same, and a non-aqueous secondary battery using the active material. SOLUTION: [1] An active material is a compound particle composed of three or more kinds of constituent elements, and Li, Na, K, Mg, Ca, Sr, Ba, B, Al, Ga, In, Si, Zr, Sn, Ti, V, Cr, Mn, Fe, C o, containing an element A selected from Ni, Cu, Ag and Zn, having a region in which the concentration of A continuously decreases from the particle surface to the inside, and the average d of the width in the depth direction of the region. And the ratio (d / D) of the particle to the average radius D is 0.001 <d / D An active material for a non-aqueous secondary battery having a value of <0.5. [2] The first step of heat-treating the raw material compound, and the production method of the second step of coating the active material with a compound containing A and then performing a heat treatment, wherein the second heat treatment time is longer than that of the first step. Also short manufacturing method. [3] A non-aqueous secondary battery using the active material of [1] above as a positive electrode and / or a negative electrode active material. |