Silicic acid-vanadic acid compound, positive electrode for secondary battery, and method for producing secondary battery

摘要

Provided is a method for producing a silicic acid-vanadic acid compound in which the composition and particle size can be easily controlled. A method for producing a silicic acid-vanadic acid compound having a composition represented by formula (B), comprising: AfMbSix (VcX1-c) 1-xO4 + d2 (B) (wherein A is Li, Na, and K) M is at least one element selected from the group consisting of Fe, Mn, Co, Ni, Cu, and Zn, and X is P, B, and Al. And at least one element selected from the group consisting of: f is 0.8 f 2.4, b is 0.7 ≦ b ≦ 1.3, c is 0 c ≦ 1, and x is 0.8. 6 x 1, and d2 is a number depending on the valence N of X, f, b, c, x, and M.) Raw material containing element A, element M, Si, V, and element X Is prepared so that the molar ratio of element A, element M, Si, V, and element X is the molar ratio represented by formula (B) To obtain a melt, to cool the melt to obtain a solidified product, to crush the solidified product to obtain a crushed product, and to heat the crushed product to obtain a silicate compound By carrying out the steps in this order, a silicate compound is produced.