FLUORIDE ION BATTERY AND METHOD FOR PRODUCING FLUORIDE ION BATTERY

The present disclosure provides a fluoride ion battery comprising a negative electrode active material that can exhibit high charge-discharge capacity, as well as a method for producing it. The fluoride ion battery of the disclosure has LaC as the negative electrode active material, where 0.00 < x < 1.00. The production method of the disclosure includes discharging a fluoride ion battery precursor having LaC as the negative electrode active material, where 0.00 < x < 1.00, until the upper limit potential of the negative electrode reaches 2.5 to 3.5 V vs Pb/PbF.