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Surface-Dominated Storage of Heteroatoms-Doping Hard Carbon for Sodium-Ion Batteries
Energy Storage Materials ( IF 20.4 ) Pub Date : 2020-01-17 , DOI: 10.1016/j.ensm.2020.01.014
Qianzheng Jin , Kangli Wang , Pingyuan Feng , Zhuchan Zhang , Shijie Cheng , Kai Jiang

Though the intercalation mechanism of hard carbon anodes for Na-ion batteries (NIBs) gain decent electrochemical performances, the sluggish diffusion kinetics of Na-ions at low potential present huge challenge to high power applications. To improve the rate capability and cycling stability, especially the performance at high rates, herein, a novel N, S co-doping strategy based on the pseudocapacitive mechanism is developed via one-step synthesis, which endows the hard carbon with excellent rate performances and long-term cycling stability. Moreover, the electrochemical behaviors of N, S co-doping carbon materials outperform those of single heteroatom (N) doping materials, owing to the additional effective covalent S bonds and more defects. The optimized NSC2 (derived from 2:1 mass ratio of thiourea and sodium citric) delivers a high reversible capacity of 280 mAh g-1 at 0.05 A g-1 for 200 cycles and 223 mAh g-1 at 1 A g-1 for 2000 cycles, respectively, and preserves 102 mAh g-1 at 10 A g-1. This work provides a universal co-doping approach on modification of hard carbon materials for high power battery applications.



中文翻译:

用于钠离子电池的杂原子掺杂硬碳的表面控制存储

尽管用于Na离子电池(NIB)的硬碳阳极的嵌入机理获得了不错的电化学性能,但低电势下Na离子的缓慢扩散动力学对高功率应用提出了巨大挑战。为了提高倍率性能和循环稳定性,特别是提高高倍率性能,本文通过一步合成法开发了一种基于拟电容机理的新型N,S共掺杂策略,使硬质碳具有优异的倍率性能和长期循环稳定性。而且,由于附加的有效共价S键和更多的缺陷,N,S共掺杂碳材料的电化学行为优于单一杂原子(N)掺杂材料的电化学行为。优化的NSC2(源自2:-1 0.05 A G -1为200个循环和223毫安克-1 1个A G -1为2000个循环,分别和蜜饯102毫安克-1以10 A G -1。这项工作为高功率电池应用的硬碳材料改性提供了一种通用的共掺杂方法。

更新日期:2020-01-17
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