POSITIVE ELECTRODE ACTIVE MATERIAL FOR NONAQUEOUS SECONDARY BATTERY, AND CHARGE AND DISCHARGE METHOD OF NONAQUEOUS SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a positive electrode active material for a non-aqueous secondary battery which consists of FeF3and shows stable charge and discharge characteristics even if FeF3is decomposed, and provide a charge and discharge method which is suitable for the non-aqueous secondary battery using the positive electrode active material.

SOLUTION: The positive electrode active material consists of FeF3powder that is capable of intercalation and desorption of alkali metal ions. The FeF3powder is impalpable powder of half-width of 0.2 rad or more of diffraction peak in (012) plane by X-ray diffraction. In the non-aqueous secondary battery having the positive electrode containing this positive electrode active material, charge and discharge is carried out in a voltage range in which reversible redox to generate Fe from FeF3by discharge and to regenerate FeF3from Fe by charge is performed.

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