Silicic acid-boric acid compound and silicic acid-boric acid-phosphoric acid compound, positive electrode for secondary battery, and method for producing secondary battery

摘要

Provided is a production method capable of inexpensively and efficiently producing a silicic acid-boric acid compound and a silicic acid-boric acid-phosphoric acid compound which are excellent in battery characteristics and reliability. An oxide conversion comprising at least one atom A selected from the group consisting of Li, Na and K, at least one atom M selected from the group consisting of Fe, Mn, Co and Ni, and Si and B The amount (mol%) is 15% A2O 30%, 35% MO 55%, 3% SiO2 50%, 1% B2O3 20%, 0.8 A2O / (0. 5SiO2 + B2O3) 1.2, 0.8 A2O / 0.5MO 1.2, the melt obtained by heating and solidifying by cooling, pulverizing, heating, AxMySi1-aBaOz (0. A silicic acid-boric acid compound having a composition represented by 8 x 1.2, 0.8 y 1.2 and 0.05 ≦ a ≦ 0.7) is produced.