| 摘要 |
PURPOSE: To provide a high capacity and an excellent charging and discharging cycle by using a compound having a specified composition with a chemical formula; Li1-x Ax Ni1-y By O2 as a positive active material. CONSTITUTION: A compound having a chemical formula Li1-x Ax Ni1-y By O2 is used as a positive active material, wherein A stands for alkali or alkaline earth metal elements, B for at least one of transition metal elements, 0<x<=0.10, 0<y<=0.30 mole ratio. In the case B stands for two or more transition metal elements, y means the total mole ratio of the transition metal elements and also in the case y=0, A contains at least an alkaline earth metal. A starting raw material containing lithium or A is added to a starting raw material containing nickel or B in at least 1.05 and at highest 1.25 stoichiometric ratio (of the former to the latter), the raw materials are sintered in oxygen atmosphere, and non-reacted alkali components are removed. As a result, the amount of an alkali metal with which lithium is substituted can be lessened and thus the initial capacity is suppressed from decreasing. |
