Freestanding hierarchically 3D porous Co2P-Co@C films with superior electrochemical kinetics for enhanced lithium-ion batteries anode performance
Freestanding hierarchically 3D porous Co2P-Co@C films with superior electrochemical kinetics for enhanced lithium-ion batteries anode performance
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独立式分层 3D 多孔 Co2P-Co@C 薄膜具有优异的电化学动力学，可增强锂离子电池阳极性能
DOI：
10.1016/j.apsusc.2020.146220
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发表时间：
2020-07-15
影响因子：
6.7
通讯作者：
Wang, Mingyong
中科院分区：
文献类型：
--
作者：
Yu, Xiangtao;Ren, Xiangyu;Wang, Mingyong
快速的电化学动力学和稳定的结构对于过渡金属磷化物（TMP）基锂离子电池负极材料的实际应用至关重要。在此，基于CoP薄膜的气泡模板法电沉积、葡萄糖吸附和退火处理，开发了一种简便的策略来构建覆盖有碳层的自支撑3D多孔双相Co2P-Co薄膜（Co2P-Co@C）。由于Co和碳涂层的大量活性位点和Co2P电导率的提高，电子/离子传输得到改善。同时，得益于多孔结构提供的充足空间和碳层的保护，体积膨胀得到缓解。因此，Co2P-Co@C薄膜表现出高可逆容量（100次循环后在0.2 A g(-1)下为823 mAh g(-1)）、优异的倍率性能（4 A g(-1)下为506 mAh g(-1)）和出色的长期循环稳定性（400次循环后在2 A g(-1)下为567.9 mAh g(-1)）。
Rapid electrochemical dynamics and stable structures are critical for the practical application of transition metal phosphides (TMPs)-based lithium-ion batteries anode materials. Herein, a facile strategy is developed to construct a self-supporting 3D porous dual-phase Co2P-Co film covered by a carbon layer (Co2P-Co@C) based on the bubble template method electrodeposition of CoP film, glucose adsorption, and annealing treatment. The electron/ion transport is improved due to a large number of active sites and increased conductivity of Co2P by Co and carbon coating. Meanwhile, the volume expansion is alleviated, benefiting from the sufficient space provided by porous structure and the protection of carbon layer. Consequently, the Co2P-Co@C film exhibits high reversible capacity (823 mAh g(-1) at 0.2 A g(-1) after 100 cycles), excellent rate capability (506 mA h g(-1) at 4 A g(-1)) and outstanding long-term cycling stability (567.9 mAh g(-1) at 2 A g(-1) after 400 cycles).