SECONDARY BATTERY SYSTEM

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The present invention is to provide a secondary battery system that functions at high voltage. The present invention provides the secondary battery system comprising : a fluoride ion battery; and a control unit controlling charging and discharging of the fluoride ion battery, wherein a cathode active material layer in the fluoride ion battery contains a cathode active material with a crystal phase that has a Perovskite layered structure and is represented by A_(n+1)B_nO_(3n+1-α )F_x (A comprises at least one of an alkali earth metal element and a rare earth element; B comprises at least one of Mn, Co, Ti, Cr, Fe, Cu, Zn, V, Ni, Zr, Nb, Mo, Ru, Pd, W, Re, Bi, and Sb; n is 1 or 2; 0 (AA) Current /mA(BB) Voltage /VCOPYRIGHT KIPO 2018