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High-Performance Potassium-Ion-Based Full Battery Enabled by an Ionic-Drill Strategy
CCS Chemistry ( IF 9.4 ) Pub Date : 2021-01-11 , DOI: 10.31635/ccschem.021.202000463
Chunlei Jiang 1, 2 , Xing Meng 1, 2 , Yongping Zheng 1 , Jiaxiao Yan 1, 3 , Zhiming Zhou 1, 2 , Yongbing Tang 1, 2, 4
Affiliation  

Potassium-ion (K+) batteries (PIBs) show great potential in large-scale energy storage applications owing to their low-cost and high-operating voltage. However, the development of practical PIBs remains hindered by their poor performance rate due to the large ionic radius of the K+ (1.38 Å). Herein, we report an ionic-drill strategy using smaller lithium ions (Li+) to open diffusion channels for K+ in the host electrode and enable much faster kinetics of K-ions. To realize this goal, a K+/Li+/PF6 hybrid configuration was rationally designed, and the K-based electrolyte hybridized with 20 atom % Li showed significantly improved diffusion kinetics and discharge capacity. The optimized K+-based full battery exhibited excellent rate performance with a specific capacity of 106 mAh g−1 at a current rate of 5 C and maintained 84.7 mAh g−1 up to 25 C. It also showed long-term cycling stability with capacity retention ∼100% over 500 cycles at 5 C. These results are the best known K+ full batteries. Thus, this work provides an effective strategy to enhance the electrochemical performance of PIBs for potential practical applications.



中文翻译:

通过离子钻策略实现高性能基于钾离子的完整电池

钾离子(K +)电池(PI +)由于其低成本和高工作电压,在大规模储能应用中显示出巨大潜力。但是,由于K +的离子半径大(1.38Å),因此实际的PIB的开发效率差,仍然阻碍了它们的发展。在本文中,我们报告了一种离子钻孔策略,该方法使用较小的锂离子(Li +)打开主体电极中K +的扩散通道,并使K离子动力学更快。为了实现这个目标,K + / Li + / PF 6 合理设计了杂化构型,与20原子%Li杂化的K基电解质显示出显着改善的扩散动力学和放电容量。经过优化的基于K +的全电池在5 C的电流速率下表现出出色的倍率性能,比容量为106 mAh g -1,在高达25 C的温度下仍保持84.7 mAh g -1的性能。在5 C下500次循环中,容量保持率〜100%。这些结果是最著名的K +全电池。因此,这项工作提供了一种有效的策略来增强PIB的电化学性能,以用于潜在的实际应用。

更新日期:2021-01-12
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