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Cyclic-anion salt for high-voltage stable potassium-metal batteries

查看全文 作　　者：Yanyao [1]Hu;Ling [1]Fan;Apparao [2]M.Rao;Weijian [1]Yu;Caixiang [1]Zhuoma;Yanhong [1]Feng;Zhihui [1]Qin;Jiang [3]Zhou;Bingan [1]Lu 高影响力作者 机构地区：[1]School of Physics and Electronics,Hunan University,Changsha 410083,China;[2]Department of Physics and Astronomy,Clemson Nanomaterials Institute,Clemson University,Clemson,SC 29634,USA;[3]School of Materials Science and Engineering,Central South University,Changsha 410083,China高影响力机构 出　　处：《National Science Review》索引2022年第9卷第10期,共11页高影响力期刊 基　　金：National Natural Science Foundation of China(22005093);the Natural Science Foundation of Hunan Province(2022JJ20011);the Fundamental Research Funds for the Central Universities(531119200156);the National Natural Science Foundation of China(U20A20247 and 51922038);A.M.R.acknowledges the seed funding provided by the R.A.Bowen Professorship funds at Clemson University。 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. 关 键 词：cyclic anion low concentration additive-free electrolyte HIGH-VOLTAGE potassium-metal batteries solid–electrolyte interface
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