| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a lithium secondary battery capable of securing chargeable and dischargeable capacity. <P>SOLUTION: This lithium ion secondary battery has a rolled group composed by rolling cathode and anode plates around an axis through a separator. Lithium manganate is used for a cathode active material, and amorphous carbon powder is used for an anode active material. When it is assumed that initial charge capacity from initial charge start to charge termination, and capacity of a constant voltage region is A (mAh/g) and B (mAh/g), respectively, and a ratio of irreversible capacity to the initial charge capacity A is C (%), the amorphous carbon powder satisfies a relationship of C≤B/A×100≤50. The capacity B of the constant voltage region without being used for charge and discharge as the lithium ion secondary battery is reduced to not greater than 50% of the initial charge capacity A, and the irreversible capacity component is satisfied by the capacity B of the constant voltage region. <P>COPYRIGHT: (C)2007,JPO&INPIT |
