| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a new positive material for stably charging and discharging in the same operation voltage area (almost 4 V) as that of the existing lithium cobalt oxide based positive electrode material, a manufacturing method of the same, and a lithium secondary battery including the material as a positive activator. <P>SOLUTION: The positive electrode material for lithium secondary battery, made of lithium-manganese oxide, represented by chemical composition formula: Li<SB>x</SB>MnO<SB>2</SB>(0.40<x<0.50), belonging to a rhombic crystal system as a crystal structure, having a tunnel structure occupied by lithium, is composed of lithium, manganese and oxygen, and of which the content of sodium is ≤0.05 at a molar ratio of Na/Li. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
