Cyclic-anion salt for high-voltage stable potassium-metal batteries. Issue 10 (9th July 2022)

• Record Type: Journal Article
• Authors: Hu, Yanyao; Fan, Ling; Rao, Apparao M; Yu, Weijian; Zhuoma, Caixiang; Feng, Yanhong; Qin, Zhihui; Zhou, Jiang; Lu, Bingan
• Is Part Of: National science review. Volume 9:Issue 10(2022)
• Publication Date: 2022-07-09
• Subjects: cyclic anion -- low concentration -- additive-free electrolyte -- high-voltage -- potassium-metal batteries -- solid–electrolyte interface; Science -- Periodicals; 505
• DOI: 10.1093/nsr/nwac134
• Languages: English
• ISSNs: 2095-5138

Abstract

Abstract: 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. Abstract : This work proposes a novel cyclic anion salt strategy for high-voltage potassium metal batteries, which is also suitable for other alkali metal batteries.