| 摘要 |
The present invention provides a cathode material for a lithium ion secondary cell having an excellent voltage characteristic and enabling to obtain a high capacity cell although cheaper than LiCoO2. The present invention uses as a cathode material a lithium compound LixMn2O4 (wherein x is in the range of 0</=x</=3) whose oxygen ions are at least partially replaced by negative ions having a greater absolute value of valence than oxygen ion. Such a lithium compound may be, for example, LixMn2O2N2.
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