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Performance of soluble lead flow batteries using lead trifluoromethylsulfonate electrolyte
Journal of Energy Storage ( IF 8.9 ) Pub Date : 2020-09-04 , DOI: 10.1016/j.est.2020.101722
Xiaofei Luo , Zheng Liu , Bailing Jiang , Dongdong Ji

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.



中文翻译:

使用三氟甲基磺酸铅电解质的可溶性铅液流电池的性能

在甲磺酸铅液流电池中,随着充电/放电循环的进行,一些PbO 2会滴入电解液中,从而降低电池效率并限制其使用寿命。在这项工作中,首先提出了可溶性三氟甲基磺酸铅的水溶液作为铅溶性液流电池的支持电解质。可以提高效率和循环稳定性。与铅(CH相比3 SO 32 / CH 3 SO 3 ħ电解质,PBO的动力学和可逆性2 /铅2+在铅改善(CF 3 SO 32 / CF 3 SO3 H电解液。在相同电流密度下,Pb(CF 3 SO 32 / CF 3 SO 3 H电解质中的充电电压低于Pb(CH 3 SO 32 / CH 3 SO 3 H电解质中的充电电压。 10-60 mA cm -2。而且,沉积在Pb(CF 3 SO 32 / CF 3 SO 3 H电解质中的PbO 2层是光滑致密的,没有任何PbO 2在数十个循环中观察到颗粒从正极掉落。Pb颗粒小于沉积在Pb(CH 3 SO 32 / CH 3 SO 3 H电解质中的颗粒。更令人印象深刻的是,通过使用Pb(CF 3 SO 32 / CF 3 SO 3 H电解质,在电流密度为40 mA cm -2的情况下,经过244个循环后,高哥伦布效率降低到80%。

更新日期:2020-09-05
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