Abstract
Abstract In lead methanesulfonate flow battery, with the charge/discharge cycling, some PbO2 drops into the electrolyte, decreasing the efficiency of the battery and limiting its service life. In this work, an aqueous solution of soluble lead trifluoromethylsulfonate is firstly proposed as a supporting electrolyte for the lead soluble flow battery. Its efficiency and the cycling stability can be improved. Compared with the Pb(CH3SO3)2/CH3SO3H electrolyte, the kinetics and reversibility of PbO2/Pb2+ are improved in the Pb(CF3SO3)2/CF3SO3H electrolyte. The charge voltage in the Pb(CF3SO3)2/CF3SO3H electrolyte is lower than that in the Pb(CH3SO3)2/CH3SO3H electrolyte at the same current density in the range of 10 - 60 mA cm−2. Moreover, the PbO2 layer deposited in the Pb(CF3SO3)2/CF3SO3H electrolyte is smooth and compact, no any PbO2 particles are observed to drop off from the positive electrode over tens of cycles. Pb particles are smaller than those deposited in the Pb(CH3SO3)2/CH3SO3H electrolyte. More impressively, the high columbic efficiency is dropped down to 80% after 244 cycles at a current density of 40 mA cm−2 by employing the Pb(CF3SO3)2/CF3SO3H electrolyte.
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