ACTIVE MATERIAL AND FLUORIDE ION BATTERY

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The main object of the present invention is to provide an active material having a favorable cycle property. The present invention achieves the object by providing an active material to be used in a fluoride ion battery. The active material includes a crystal phase having a layered perovskite structure and is represented by A_(n+1)B_nO_(3n+1-α )F_x. A is composed of at least one of an alkaline earth metal element and a rare earth element; B is composed of at least one among Mn, Co, Ti, Cr, Fe, Cu, Zn, V, Ni, Zr, Nb, Mo, Ru, Pd, W, Re, Bi, and Sb; n is 1 or 2; α satisfies 0 (AA) Potential difference/V vs. Pb/PbF_2(BB) Capacity/mAhCOPYRIGHT KIPO 2017