| abstract |
Gas generation inside a battery is suppressed. A molybdate compound is deposited on composite oxide particles mainly composed of lithium nickelate, and heat treatment is performed to obtain a positive electrode active material. Preferably, at least one of a sulfuric acid compound, a nitric acid compound, a boric acid compound, and a phosphoric acid compound is attached to the composite oxide particles together with the molybdic acid compound, and heat treatment is performed. In a secondary battery that is manufactured using such a method and uses a positive electrode active material having a carbonate ion content of 0.15 wt% or less, gas generation inside the battery can be suppressed. The heat treatment is performed after a compound other than a molybdate compound such as a molybdate compound and a sulfate compound is mixed and deposited on the composite oxide particles. Alternatively, first, a compound other than a molybdate compound such as a sulfuric acid compound may be deposited on the composite oxide particles and heat-treated, and then the molybdate compound may be deposited and heat-treated. [Selection] Figure 1 |