电解质
阳极
电化学
钝化
钾
盐(化学)
材料科学
阴极
钾离子电池
碳酸钾
电池(电)
金属
锂(药物)
离子
腐蚀
无机化学
化学工程
电极
化学
纳米技术
冶金
磷酸钒锂电池
有机化学
医学
功率(物理)
物理
物理化学
图层(电子)
量子力学
内分泌学
工程类
作者
Yanyao Hu,Ling Fan,Apparao M. Rao,Weijian Yu,Zhuoma Caixiang,Yanhong Feng,Zhihui Qin,Jiang Zhou,Bingan Lu
摘要
Electrolyte anions are critical for achieving high-voltage stable potassium-metal batteries (PMBs). However, the common anions cannot simultaneously prevent the formation of 'dead K' and the corrosion of Al current collector, resulting in poor cycling stability. Here, we demonstrate cyclic anion of hexafluoropropane-1,3-disulfonimide-based electrolytes that can mitigate the 'dead K' and remarkably enhance the high-voltage stability of PMBs. Particularly, even using low salt concentration (0.8 M) and additive-free carbonate-based electrolytes, the PMBs with a high-voltage polyanion cathode (4.4 V) also exhibit excellent cycling stability of 200 cycles with a good capacity retention of 83%. This noticeable electrochemical performance is due to the highly efficient passivation ability of the cyclic anions on both anode and cathode surfaces. This cyclic-anion-based electrolyte design strategy is also suitable for lithium and sodium-metal battery technologies.
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