摘要 |
Coagulated particles of nickel-cobalt-manganese hydroxide wherein primary particles are coagulated to form secondary particles are synthesized by allowing an aqueous solution of a nickel-cobalt-manganese salt, an aqueous solution of an alkali-metal hydroxide, and an ammonium-ion donor to react under specific conditions; and a lithium-nickel-cobalt-manganese-containing composite oxide represented by a general formula, Li<SUB>p</SUB>Ni<SUB>x</SUB>Mn<SUB>1-x-y</SUB>Co<SUB>y</SUB>O<SUB>2-q</SUB>F<SUB>q </SUB>(where 0.98<=p<=1.07, 0.3<=x<=0.5, 0.1<=y<=0.38, and 0<=q<=0.05), which is a positive electrode active material for a lithium secondary cell having a wide usable voltage range, a charge-discharge cycle durability, a high capacity and high safety, is obtained by dry-blending coagulated particles of nickel-cobalt-manganese composite oxyhydroxide formed by making an oxidant to act on the coagulated particles with a lithium salt, and firing the mixture in an oxygen-containing atmosphere.
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