SECONDARY BATTERY, ELECTRONIC DEVICE, ELECTRIC POWER TOOL, ELECTRICAL VEHICLE, AND ELECTRIC POWER STORAGE SYSTEM

摘要

PURPOSE: A secondary battery is provided to restrain resistance increase even after repeating charging and discharging by comprising titanium-containing lithium composite oxide as an anode active material, and cyclic disulfonic acid anhydride as an electrolyte. CONSTITUTION: A secondary battery comprises a cathode, an anode, and an electrolyte. The anode comprises one or more selected from titanium-containing lithium composite oxide represented by chemical formula 1: Li[Li_xM1_((1-3x)/2)Ti_((3+x)/2)]O_4, chemical formula 2: Li[Li_yM2_(1-3y)Ti_(1+2y)]O_4, and chemical formula 3: Li[Li_(1/3)M3_zTi_((5/3)-z)]O_4. The electrolyte comprises a cyclic disulfonic acid anhydride represented by chemical formula 4 or/and a cyclic disulfonic acid anhydride represented by chemical formula 5.