| 摘要 |
Li<SUB>2-x</SUB>A<SUB>x</SUB>MO<SUB>3 </SUB>obtained by replacing lithium in Li<SUB>2</SUB>MO<SUB>3 </SUB>having a layered structure by an alkali metal having ion radius larger than that of lithium is used as a positive electrode active material. In this Li<SUB>2-x</SUB>A<SUB>x</SUB>MO<SUB>3</SUB>, x satisfies the relation 0<x<=O.5, the above-mentioned A indicates the alkali metal having the ion radius larger than that of lithium (Li) (for example, sodium (Na) or potassium (K)) and M indicates a transition metal that can be tetravalent. Examples of the transition metal that can be tetravalent indicated by the above-mentioned M include manganese (Mn), molybdenum (Mo), titanium (Ti), platinum (Pt), iridium (Ir), ruthenium (Ru) and the like.
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