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Highly Efficient Non-Nucleophilic Mg(CF3SO3)2-Based Electrolyte for High-Power Mg/S Battery
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-04-03 , DOI: 10.1021/acsami.0c00196
Dan Huang 1 , Shuangshuang Tan 1 , Maosheng Li 1 , Dandan Wang 2 , Chunhua Han 1 , Qinyou An 1 , Liqiang Mai 1
Affiliation  

The application of high-energy Mg/S batteries was obstructed by the insufficiency of low-cost and non-nucleophilic electrolyte. In this work, a non-nucleophilic electrolyte was prepared by facilely dissolving Mg(CF3SO3)2, MgCl2, and AlCl3 in 1,2-dimethoxyethane (DME). The equilibrium species of the MTB electrolyte mainly comprise [Mg2(μ-Cl)2(DME)4]2+ and [(CF3SO3)AlCl3], which are generated by dehalodimerization reaction and Lewis acid–base reaction, respectively. The electrolyte exhibits a highly efficient reversible Mg deposition/dissolution, low overpotential of around 250 mV, and good oxidative stability up to 3.5 V after conditioning. The conditioning process that the active [Mg2(μ-Cl)2(DME)4]2+ species transforms into [Mg33-Cl)(μ2-Cl)2(DME)7]3+ was demonstrated, owing to the irreversible deposition of Al3+ on Mg foil. More importantly, this electrolyte exhibited good compatibility and kinetics for reversible Mg/MgSx redox, resulting in a high specific capacity of 866 mAh g–1 at 200 mA g–1 and high power density of 550 W kg–1. This work offers a new direction for low-cost, non-nucleophilic electrolyte and paves the way to explore high-power Mg/S batteries.

中文翻译:

用于大功率Mg / S电池的高效非亲核Mg(CF 3 SO 32基电解质

低成本和非亲核电解质的不足阻碍了高能Mg / S电池的应用。在这项工作中,通过将Mg(CF 3 SO 32,MgCl 2和AlCl 3容易地溶解在1,2-二甲氧基乙烷(DME)中来制备非亲核电解质。MTB电解质的平衡物质主要包括[Mg 2(μ-Cl)2(DME)4 ] 2+和[(CF 3 SO 3)AlCl 3 ] -分别由脱卤二聚反应和路易斯酸碱反应生成。电解液在调节后表现出高效的可逆Mg沉积/溶解,约250 mV的低过电势以及高达3.5 V的良好氧化稳定性。调节过程使活性[镁2(μ-Cl)的2(DME)4 ] 2+物种变换成[镁3(μ 3 -Cl)(μ 2 -Cl)2(DME)7 ] 3+证明,由于不可逆的Al 3+沉积在镁箔上。更重要的是,这种电解质对可逆的Mg / MgS x氧化还原表现出良好的相容性和动力学,从而在200 mA g –1时具有866 mAh g –1的高比容量,并具有550 W kg –1的高功率密度。这项工作为低成本,非亲核电解质提供了新的方向,并为探索大功率Mg / S电池铺平了道路。
更新日期:2020-04-03
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