| 摘要 |
The present invention provides a positive electrode active material for lithium ion batteries having satisfactory battery characteristics. The positive electrode active material for lithium ion batteries, is represented by the following composition formula: Li(LixNi1-x-yMy)O2+alpha wherein M represents one or more selected from the group consisting of scandium (Sc), titanium (Ti), vanadium (V), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), copper (Cu), zinc (Zn), gallium (Ga), germanium (Ge), bismuth (Bi), tin (Sn), magnesium (Mg), calcium (Ca), boron (B) and zirconium (Zr); 0@x@0.1; 0<y@0.7; and alpha>0, wherein the particle size of primary particles is 1.6 to 2.3 mum, the alkali amount at the particle surfaces measured by two-stage neutralization titration is 1.2% by mass or less, and when the amount of lithium hydroxide in the alkali amount at the particle surfaces is designated as A% by mass, and the amount of lithium carbonate is designated as B% by mass, the ratio A/B is 1 or less.
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