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Fast-Charging Nonaqueous Potassium-Ion Batteries Enabled by Rational Construction of Oxygen-Rich Porous Nanofiber Anodes
ACS Applied Materials & Interfaces ( IF 9.5 ) Pub Date : 2021-10-12 , DOI: 10.1021/acsami.1c15524
Sheng-Yang Li 1 , Hong-Li Deng 2 , Zong-Lin Chu 2 , Tao Wang 2 , Lei Wang 2 , Qiu-Sheng Zhang 2 , Jin-Hui Cao 2 , Ying-Liang Cheng 1 , Yang-Qiang Huang 2 , Jian Zhu 2 , Bing-An Lu 3
Affiliation  

Practical applications of carbon anodes in high-power potassium-ion batteries (PIBs) were hampered by their limited rate properties, due to the sluggish K+ transport kinetics in the bulk. Constructing convenient ion/electron transfer channels in the electrode is of great importance to realize fast charge/discharge rates. Here, cross-linked porous carbon nanofibers (inner porous carbon nanotubes and outer soft carbon layer) modified with oxygen-containing functional groups were well designed as anodes to realize robust de-/potassiation kinetics. The novel anode delivered excellent rate capabilities (107 mAh g–1 at 20 A g–1 and 78 mAh g–1 at 40 A g–1) and superior cycling stability (76% capacity retention after 14,000 cycles at 2 A g–1). In situ XRD measurement, in situ Raman spectra, and galvanostatic intermittent titration verified its surface-dominated potassium storage behavior with fast de-/potassiation kinetics, excellent reversibility, and rapid ion/electron transport. Moreover, theoretical investigation revealed that the carboxyl groups in the carbon offered additional capacitive adsorption sites for K+, thus significantly enhancing the reversible capacity. Surprisingly, a full cell using the anode and perylene-3,4,9,10-tetracarboxylic dianhydride cathode achieved an outstanding power density of 23,750 W kg–1 and superior fast charge/slow discharge performance.

中文翻译:

富氧多孔纳米纤维阳极的合理构建使快速充电非水钾离子电池成为可能

碳阳极在高功率钾离子电池 (PIB) 中的实际应用受到其有限的速率特性的阻碍,这是由于本体中缓慢的 K +传输动力学。在电极中构建方便的离子/电子传输通道对于实现快速充电/放电速率非常重要。在这里,用含氧官能团改性的交联多孔碳纳米纤维(内部多孔碳纳米管和外部软碳层)被很好地设计为阳极,以实现稳健的脱钾动力学。新颖的阳极递送优异的速率能力(107毫安克-1在20 A G -1和78毫安克-1以40克-1) 和优异的循环稳定性(在 2 A g –1 下14,000 次循环后容量保持率为 76% )。原位 XRD 测量、原位拉曼光谱和恒电流间歇滴定验证了其表面主导的钾储存行为,具有快速脱钾动力学、优异的可逆性和快速的离子/电子传输。此外,理论研究表明,碳中的羧基为 K +提供了额外的电容吸附位点,从而显着提高了可逆容量。令人惊讶的是,使用阳极和苝-3,4,9,10-四羧酸二酐阴极的全电池实现了 23,750 W kg –1的出色功率密度和卓越的快速充电/慢放电性能。
更新日期:2021-10-27
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