Reversible Dendrite-Free Potassium Plating and Stripping Electrochemistry for Potassium Secondary Batteries,Journal of the American Chemical Society

当前位置： X-MOL 学术 › J. Am. Chem. Soc. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Reversible Dendrite-Free Potassium Plating and Stripping Electrochemistry for Potassium Secondary Batteries
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2017-07-05 , DOI: 10.1021/jacs.7b04945
Neng Xiao ₁ , William D. McCulloch ₁ , Yiying Wu ₁

Affiliation

Rechargeable potassium metal batteries have recently emerged as alternative energy storage devices beyond lithium-ion batteries. However, potassium metal anodes suffer from poor reversibility during plating and stripping processes due to their high reactivity and unstable solid electrolyte interphase (SEI). Herein, it is reported for the first time that a potassium bis(fluoroslufonyl)imide (KFSI)-dimethoxyethane (DME) electrolyte forms a uniform SEI on the surface of potassium enabling reversible potassium plating/stripping electrochemistry with high efficiency (∼99%) at ambient temperature. Furthermore, the superconcentrated KFSI-DME electrolyte shows excellent electrochemical stability up to 5 V (vs K/K+) which enables good compatibility with high-voltage cathodes. Full cells with potassium Prussian blue cathodes are demonstrated. Our work contributes toward the understanding of potassium plating/stripping electrochemistry and paves the way for the development of potassium metal battery technologies.

中文翻译：

用于钾二次电池的可逆无枝晶钾电镀和剥离电化学

可充电钾金属电池最近已成为锂离子电池之外的替代能源存储设备。然而，钾金属阳极由于其高反应性和不稳定的固体电解质中间相（SEI），在电镀和剥离过程中的可逆性较差。在此，首次报道了双（氟磺酰基）亚胺钾（KFSI）-二甲氧基乙烷（DME）电解质在钾表面形成均匀的 SEI，从而实现高效（~99%）的可逆钾电镀/剥离电化学在环境温度下。此外，超浓缩 KFSI-DME 电解质在高达 5 V（vs K/K+）时表现出优异的电化学稳定性，可与高压阴极良好兼容。展示了带有钾普鲁士蓝阴极的全电池。

更新日期：2017-07-05

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南