Composite Polymer Electrolyte for Highly Cyclable Room-Temperature Solid-State Magnesium Batteries
Composite Polymer Electrolyte for Highly Cyclable Room-Temperature Solid-State Magnesium Batteries
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DOI：
10.1021/acsaem.9b01455
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发表时间：
2019-11-01
影响因子：
6.4
通讯作者：
Shahbazian-Yassar, Reza
中科院分区：
文献类型：
--
作者：
Deivanayagam, Ramasubramonian;Cheng, Meng;Shahbazian-Yassar, Reza
开发一种具有宽电压窗、Mg2+-金属阳极高度可逆循环、不使用任何易燃溶剂的候选电解质是可充电Mg电池的主要挑战。“虽然已经有一些关于高离子电导率的Mg2+导电聚合物电解质的报道，但确定其循环性能和mg沉积过电位的研究很少。”在这里，我们报道了一种复合聚合物电解质，在室温下与镁金属阳极表现出高度可逆的循环。所合成的聚合物电解质在室温下具有0.16 mS cm（-1）的高电导率，并对Mg竖棒对称电池进行了恒流循环试验，结果表明，在0.1 ~ 0.3 V的低过电位下，可进行400次循环的可逆Mg沉积/剥离。这种复合聚合物电解质的循环稳定性在室温固态镁电解质中是前所未有的，并且观察到的过电位值甚至可以与目前最先进的液体电解质相媲美。
Developing an electrolyte candidate with a wide voltage window, highly reversible cycling with Mg2+-metal anode, and without the use of any flammable solvents is a major challenge for rechargeable Mg batteries. 'While there have been several reports on Mg2+-conducting polymer electrolytes with high ionic conductivities, studies to determine their cycling performance and Mg-deposition overpotentials have been scarce. Here, we report a composite polymer electrolyte that exhibits a highly reversible cycling with Mg-metal anode at room temperature. The synthesized polymer electrolyte has a high conductivity of 0.16 mS cm(-1) at room temperature, and the galvanostatic cycling tests of Mg vertical bar Mg symmetric cells reveal that the reversible Mg deposition/stripping occurs at low overpotentials of 0.1-0.3 V for up to 400 cycles. The cycling stability of this composite polymer electrolyte is unprecedented among ambient-temperature solid-state Mg electrolytes, and the observed overpotential values are even comparable to those of the present state-of-the-art liquid electrolytes.