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Cyclic Ether-Based Electrolyte with a Weak Solvation Structure for Advanced Potassium Metal Batteries
Small ( IF 13.0 ) Pub Date : 2024-08-08 , DOI: 10.1002/smll.202403642 Danni Wang 1 , Zhijie Wang 1 , Dengyun Zhai 2 , Biao Zhang 1
Small ( IF 13.0 ) Pub Date : 2024-08-08 , DOI: 10.1002/smll.202403642 Danni Wang 1 , Zhijie Wang 1 , Dengyun Zhai 2 , Biao Zhang 1
Affiliation
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Potassium metal batteries (PMBs) are promising candidates for large-scale energy storage. Conventional carbonate electrolytes exhibit unsatisfactory thermodynamic stability against potassium (K) metal anode. Linear ether is widely adopted because of its compatibility with K metal, but the poor oxidation stability restricts the application with high-voltage cathodes. Herein, a weakly solvating cyclic ether is proposed as a solvent to stabilize the K-electrolyte interface and build a robust solid-electrolyte interphase (SEI). This weakly solvating electrolyte (WSE) possesses an anion-dominated solvation structure, which facilitates the anion decomposition for constructing an inorganic-rich SEI. The superior mechanical properties of the SEI, as examined by atomic force microscopy, prevent the SEI from fracture. Consequently, this WSE achieves highly reversible plating/stripping behavior of K metal for 1300 h with a high average Coulombic efficiency of 99.20%. Stable full cells are also demonstrated with a high-voltage cathode at harsh conditions. This work complements the design of WSEs for advanced PMBs by cyclic ether solvents.
中文翻译：
用于先进钾金属电池的具有弱溶剂化结构的环醚基电解质
钾金属电池（PMB）是大规模储能的有希望的候选者。传统的碳酸盐电解质对钾（K）金属阳极的热力学稳定性不令人满意。直链醚因其与K金属的相容性而被广泛采用，但其较差的氧化稳定性限制了其在高压阴极中的应用。在此，提出弱溶剂化环醚作为溶剂来稳定K-电解质界面并构建坚固的固体电解质界面（SEI）。这种弱溶剂化电解质（WSE）具有阴离子主导的溶剂化结构，有利于阴离子分解，从而构建富含无机物的SEI。通过原子力显微镜检查，SEI 具有优异的机械性能，可防止 SEI 断裂。因此，该 WSE 实现了 K 金属 1300 小时的高度可逆电镀/剥离行为，平均库仑效率高达 99.20%。还通过高压阴极在恶劣条件下展示了稳定的全电池。这项工作补充了使用环醚溶剂的高级 PMB 的 WSE 设计。
更新日期：2024-08-08
中文翻译：
用于先进钾金属电池的具有弱溶剂化结构的环醚基电解质
钾金属电池（PMB）是大规模储能的有希望的候选者。传统的碳酸盐电解质对钾（K）金属阳极的热力学稳定性不令人满意。直链醚因其与K金属的相容性而被广泛采用，但其较差的氧化稳定性限制了其在高压阴极中的应用。在此，提出弱溶剂化环醚作为溶剂来稳定K-电解质界面并构建坚固的固体电解质界面（SEI）。这种弱溶剂化电解质（WSE）具有阴离子主导的溶剂化结构，有利于阴离子分解，从而构建富含无机物的SEI。通过原子力显微镜检查，SEI 具有优异的机械性能，可防止 SEI 断裂。因此，该 WSE 实现了 K 金属 1300 小时的高度可逆电镀/剥离行为，平均库仑效率高达 99.20%。还通过高压阴极在恶劣条件下展示了稳定的全电池。这项工作补充了使用环醚溶剂的高级 PMB 的 WSE 设计。
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