| 摘要 |
The present invention provides a positive electrode active material comprising: a positive electrode active material body having a composition of Li1+xMn2-x-yMyO4 wherein M denotes at least one element selected from elements other than Mn, alkaline metal elements and alkaline earth metal elements, 0<=x<=0.2 and 0<=y<=0.3; and a cover layer formed on a surface of the positive electrode active material body, the cover layer being composed of a metal oxide containing at least Mn and Li; wherein the number of metal atoms other than Mn and Li, which constitute the cover layer, is 0.01-20 times the number of Mn atoms when the cover layer is subjected to X-ray photoelectric spectroscopy (XPS). It is also preferable that the cover layer is composed of a metal oxide composited with Li, and the cover layer has a normal spinel structure. |
