Compound, and lithium ion battery

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PROBLEM TO BE SOLVED : To provide a compound useful as a positive electrode active material for a lithium ion battery from which a large discharge capacity can be obtained, and a lithium ion battery using the compound.SOLUTION : A compound is represented by the following general formula (1). LiFeMPO...general formula (1). In the general formula (1), M represents at least one of Nb, Mo, Ru, Rh, Pd, Ag, Hf, Ta, W, Re, Ir, Pt and Au, a represents 1.5-2.5, b represents 0.700-0.990, and c represents 0.010-0.300.