消除阴极-电解质界面的电荷转移,实现钠离子电池的超快动力学

IF 15.6 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Xue Huang, Haoxiang Sun, Xiangyi Li, Wenhao Zhu, Lei Chen, Tian Ma, Shulin Ding, Tao Ma, Yang Dong, Kai Zhang, Fangyi Cheng, Qiulong Wei, Lijun Gao*, Jianqing Zhao*, Wei Zhang* and Jun Chen*, 
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引用次数: 0

摘要

钠离子电池存在动力学问题,这是因为离子在电极-电解质界面上的传输缓慢,导致电池在快速充电或低温运行时能量迅速衰减。增强动力学的一个令人兴奋的前景是构建类似神经元的电极,以模拟神经系统中的快速信号传输。人们认为,这些受生物启发的设计可增强电极通过碳网络的电子/离子传输。然而,它们是否能避免电极-电解质界面的电荷转移迟缓仍是未知数。通过将碳纳米管的开口与碳包覆的 Na3V2O2(PO4)2F 阴极纳米粒子表面相连,我们在此利用碳纳米管捕获充电时从纳米粒子中释放的 Na+ 离子。因此,Na+ 的运动仅局限于神经元状阴极内部,消除了电解质和阴极之间的离子传输,而这在传统电池中几乎无法实现。因此,与未经改性的阴极相比,界面电荷转移电阻降低了 14 倍,从而实现了优越的快速充电性能和高达 200℃ 的出色循环性,而且令人惊讶的是,无需改性电解质即可在低至 -60 ℃ 的低温条件下可逆运行,超过了迄今为止报道的其他基于 Na3V2O2(PO4)2F 的电池。200 多年来,电池的运行一直依赖于电极-电解质界面上的电荷转移,而我们的方法偏离了这一传统的离子传输模式,为制造能在恶劣条件下工作的更好的电池铺平了道路。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Eliminating Charge Transfer at Cathode-Electrolyte Interface for Ultrafast Kinetics in Na-Ion Batteries

Eliminating Charge Transfer at Cathode-Electrolyte Interface for Ultrafast Kinetics in Na-Ion Batteries

Sodium-ion batteries suffer from kinetic problems stemming from sluggish ion transport across the electrode–electrolyte interface, causing rapid energy decay during fast-charging or low-temperature operation. One exciting prospect to enhance kinetics is constructing neuron-like electrodes that emulate fast signal transmission in a nervous system. It has been considered that these bioinspired designs enhance electron/ion transport of the electrodes through carbon networks. However, whether they can avoid sluggish charge transfer at the electrode–electrolyte interface remains unknown. By connecting the openings of carbon nanotubes with the surface of carbon-coated Na3V2O2(PO4)2F cathode nanoparticles, here we use carbon nanotubes to trap Na+ ions released from the nanoparticles during charge. Therefore, Na+ movement is confined only inside the neuron-like cathode, eliminating ion transport between the electrolyte and cathode, which has been scarcely achieved in conventional batteries. As a result, a 14-fold reduction in interfacial charge transfer resistance is achieved when compared to unmodified cathodes, leading to superior fast-charging performance and excellent cyclability up to 200C, and surprisingly, reversible operation at low temperatures down to −60 °C without electrolyte modification, surpassing other Na3V2O2(PO4)2F-based batteries reported to date. As battery operation has relied on charge transfer at the electrode–electrolyte interface for over 200 years, our approach departs from this traditional ion transport paradigm, paving the way for building better batteries that work under harsh conditions.

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来源期刊
CiteScore
24.40
自引率
6.00%
发文量
2398
审稿时长
1.6 months
期刊介绍: The flagship journal of the American Chemical Society, known as the Journal of the American Chemical Society (JACS), has been a prestigious publication since its establishment in 1879. It holds a preeminent position in the field of chemistry and related interdisciplinary sciences. JACS is committed to disseminating cutting-edge research papers, covering a wide range of topics, and encompasses approximately 19,000 pages of Articles, Communications, and Perspectives annually. With a weekly publication frequency, JACS plays a vital role in advancing the field of chemistry by providing essential research.
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