| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a positive electrode active material suppressing the generation of gas inside a battery. <P>SOLUTION: A tungstic acid compound is attached to composite oxide particles mainly composed of lithium nickelate, and heat-treated to form the 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 together with the tungstic acid compound to the composite oxide particles and heat-treated. The generation of gas inside the battery can be suppressed in the secondary battery using the positive electrode active material manufactured by this method and having 0.15 wt.% or less of carbonate ion content. Heat treatment is performed after the tungstic acid compound and the compound such as the sulfuric acid compound other than the tungstic acid compound are mixed and attached to the composite oxide particles. Alternatively, the compound such as the sulfuric acid compound other than the tungstic acid compound may be first attached to the composite oxide particles and heat-treated, and then the tungstic acid compound may be attached and heat-treated. <P>COPYRIGHT: (C)2010,JPO&INPIT |
