Yifan Chen, Qiang Huang, Rong Zhao, Bing Sun, Wenli Xu, Yinhong Gao, Xu Nan, Qiqi Li, Yao Yang, Ye Cong, Xuanke Li, Qin Zhang, Nianjun Yang
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引用次数: 0
摘要
过渡金属氮化物(TMNs)具有很高的理论容量和优异的导电性,作为锂离子电池(LIBs)的负极材料具有很大的潜力,但由于其缓慢的动力学特性,其速率性能较差。本文以 Fe2N 为例,利用掺杂 Co 来提高 Fe2N 的功函数,从而加速电荷转移并增强对 Li+ 离子的吸附。各种掺杂 Co 的 Fe2N 纳米粒子被锚定在蜂窝状多孔泡沫碳(命名为 Cox-Fe2N@C)表面。掺杂钴可以增大原始 Fe2N 的功函数,从而优化充放电动力学。Co0.3-Fe2N@C 和 Co0.1-Fe2N@C 的功函数分别从 5.23 eV(原始 Fe2N)和 5.56 eV 提高到 5.67 eV。正如预期的那样,Co0.1-Fe2N@C 电极表现出最高的比容量(100 mA g-1 时为 673 mA h g-1)和显著的速率能力(5 000 mA g-1 时为 375 mA h g-1),优于大多数已报道的 TMNs 电极。因此,这项工作为设计和调节高性能甚至商业化 LIB 的阳极材料提供了一种前景广阔的策略。
Tuning Work Function of Fe2N@C Nanosheets by Co Doping for Enhanced Lithium Storage
Transition metal nitrides (TMNs) with high theoretical capacity and excellent electrical conductivity have great potential as anode materials for lithium-ion batteries (LIBs), but suffer from poor rate performance due to the slow kinetics. Herein, taking the Fe2N for instance, Co doping is utilized to enhance the work function of Fe2N, which accelerates the charge transfer and strengthens the adsorption of Li+ ions. The Fe2N nanoparticles with various Co dopants are anchoring on the surface of honeycomb porous carbon foam (named Cox-Fe2N@C). Co-doping can enlarge the work function of pristine Fe2N and thereby optimize the charging/discharging kinetics. The work function can be increased from 5.23 eV (pristine Fe2N) to 5.67 eV for Co0.3-Fe2N@C and 5.56 eV for Co0.1-Fe2N@C. As expected, the Co0.1-Fe2N@C electrode exhibits the highest specific capacity (673 mA h g−1 at 100 mA g−1) and remarkable rate capability (375 mA h g−1 at 5 000 mA g−1), outperforming most reported TMNs electrodes. Therefore, this work provides a promising strategy to design and regulate anode materials for high-performance and even commercially available LIBs.
期刊介绍:
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