极快充电钾离子电池的极性梯度CEI驱动快速脱溶。

IF 16.9
Ying Mo, Wang Zhou, Shiru Wu, Zuqin Duan, Peng Gao, Yan Duan, Peitao Xiao, Hao Ouyang, Shi Chen, Jilei Liu
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引用次数: 0

摘要

与锂离子电池相比,钾离子电池(PIBs)提供了一个更好的快速充电机会,因为它们在电解质中的K+传输速度更快。然而,阴极电解质间相(CEI)严重的副反应、缓慢的K+传输和阴极结构降解阻碍了快速充电PIBs的发展。在此,我们通过电解质添加剂改性策略定制了极性梯度CEI。具体来说,在脱溶过程中,外层的B-F/B-O物质有助于将K+周围的溶剂分子抽离,而遍布CEI的丰富的K2CO3和KF有助于K+的运输和结构稳定性。因此,KFeHCF/石墨电池在快速充电条件下表现出更好的电荷转移和扩散动力学,抑制了铁的溶解,提高了阴极体结构和间相的稳定性。具有优化CEI的全电池在0.02 A g-1时可提供126.5 mAh g-1的高可逆容量,在1 A g-1时可提供95.8 mAh g-1(充电时间为7.5分钟,容量为80%),在5 A g-1时可保持67 mAh g-1,并具有良好的长循环寿命。此外,它保持85.1 mAh g-1,即使在-10°C下也表现出良好的速率性能。我们的工作揭示了合理调节CEI组件和结构对快速充电pib的关键作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Polarity Gradient CEI Driven Rapid Desolvation for Extreme Fast-Charging Potassium-Ion Batteries.

Potassium-ion batteries (PIBs) offer an opportunity for superior fast-charging compared to lithium-ion batteries, owing to their faster K+ transport in electrolyte. However, severe side reactions at the cathode electrolyte interphase (CEI), sluggish K+ transport, and cathode structural degradation hinder the development of fast-charging PIBs. Herein, we tailor-design a polarity gradient CEI via an electrolyte additives modification strategy. Specifically, the outer B-F/B-O species assist in withdrawing solvent molecules around K+ during the desolvation process, while abundant K2CO3 and KF throughout the CEI facilitate K+ transport and structural stability. Consequently, the KFeHCF/graphite full cell demonstrates improved charge transfer and diffusion kinetics, with suppressed Fe dissolution, enhancing stability of both the cathode bulk structure and interphase under fast-charging conditions. The full cell with optimized CEI delivers high reversible capacities of 126.5 mAh g-1 at 0.02 A g-1 and 95.8 mAh g-1 at 1 A g-1 (a charging time of 7.5 min for 80% of the capacity), and maintains 67 mAh g-1 at 5 A g-1 as well as good long cycle life. Moreover, it retains 85.1 mAh g-1 and exhibits good rate performance even at -10 °C. Our work reveals the critical role of rationally regulating CEI components and structure for fast-charging PIBs.

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