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Phase-junction engineering boosts the performance of CoSe2 for efficient sodium/potassium storage
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2021-10-11 , DOI: 10.1039/d1ta08072e Xiaofeng Li 1 , Du Pan 2 , Jun Deng 3 , Ran Wang 4 , Jinzhen Huang 4 , Weiming Lü 5 , Tai Yao 4 , Xianjie Wang 1 , Yumin Zhang 4 , Lingling Xu 6 , Ying Bai 2 , Ping Xu 7 , Bo Song 4
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2021-10-11 , DOI: 10.1039/d1ta08072e Xiaofeng Li 1 , Du Pan 2 , Jun Deng 3 , Ran Wang 4 , Jinzhen Huang 4 , Weiming Lü 5 , Tai Yao 4 , Xianjie Wang 1 , Yumin Zhang 4 , Lingling Xu 6 , Ying Bai 2 , Ping Xu 7 , Bo Song 4
Affiliation
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Sodium ion batteries (SIBs) and potassium ion batteries (PIBs) are the most promising alternative candidates to lithium ion batteries (LIBS), owing to their natural abundance and low cost. Herein, a unique cubic/orthorhombic-CoSe2 phase-junction (c/o-CoSe2) anchored on SiC nanowires (NWs) (denoted as c/o-CoSe2@SiC) is developed. The electron coupling effect of phase-junction interface promotes the diffusion of Na+/K+. Meanwhile, SiC NWs play a pivotal role in stabilizing the active materials, improving the cycling stability and providing fast transport pathways for electrons. Thus, c/o-CoSe2@SiC exhibits a sodium storage performance of 413 mA h g−1 after 300 cycles at 0.2 A g−1 with an 86.66% capacity retention rate and 300 mA h g−1 after 1000 cycles at 1 A g−1, as well as a potassium storage performance of 190 mA h g−1 after 500 cycles at 1.0 A g−1. Moreover, the electrochemical reaction mechanism and the structural reversibility of c/o-CoSe2@SiC are also revealed by operando Raman, operando powder X-ray diffraction (PXRD) and ex situ high resolution transmission electron microscopy (HRTEM) characterization. And theoretical calculations revealed the redistribution of charge and the strongest adsorption of Na+ from the electrolyte at the phase-junction of c/o-CoSe2. Phase-junction engineering could provide a new strategy for developing high-performance SIBs and PIBs.
中文翻译：
相结工程提高了 CoSe2 的性能，以实现高效的钠/钾存储
钠离子电池（SIBs）和钾离子电池（PIBs）由于天然丰富且成本低，是锂离子电池（LIBS）最有前途的替代品。在此，开发了一种独特的立方/正交-CoSe 2相结（c/o-CoSe 2）固定在 SiC 纳米线（NW）上（表示为 c/o-CoSe 2 @SiC）。相-结界面的电子耦合效应促进了Na + /K +的扩散。同时，碳化硅纳米线在稳定活性材料、提高循环稳定性和为电子提供快速传输途径方面发挥着关键作用。因此，c/o-CoSe 2 @SiC 的储钠性能为 413 mA hg -1后在0.2 A克300次循环-1具有86.66％的容量保持率和300毫安汞柱-1 1个A G 1000次循环后-1，以及一个190毫安汞柱钾存储性能-1后在1.0 500次循环A g -1。此外，还通过原位拉曼、原位粉末X射线衍射（PXRD）和非原位高分辨率透射电子显微镜（HRTEM）表征揭示了c/o-CoSe 2 @SiC的电化学反应机理和结构可逆性。并且理论计算揭示了电荷的重新分布和最强的Na +吸附来自 c/o-CoSe 2相结处的电解质。相结工程可以为开发高性能 SIB 和 PIB 提供一种新策略。
更新日期：2021-10-26
中文翻译：
相结工程提高了 CoSe2 的性能，以实现高效的钠/钾存储
钠离子电池（SIBs）和钾离子电池（PIBs）由于天然丰富且成本低，是锂离子电池（LIBS）最有前途的替代品。在此，开发了一种独特的立方/正交-CoSe 2相结（c/o-CoSe 2）固定在 SiC 纳米线（NW）上（表示为 c/o-CoSe 2 @SiC）。相-结界面的电子耦合效应促进了Na + /K +的扩散。同时，碳化硅纳米线在稳定活性材料、提高循环稳定性和为电子提供快速传输途径方面发挥着关键作用。因此，c/o-CoSe 2 @SiC 的储钠性能为 413 mA hg -1后在0.2 A克300次循环-1具有86.66％的容量保持率和300毫安汞柱-1 1个A G 1000次循环后-1，以及一个190毫安汞柱钾存储性能-1后在1.0 500次循环A g -1。此外，还通过原位拉曼、原位粉末X射线衍射（PXRD）和非原位高分辨率透射电子显微镜（HRTEM）表征揭示了c/o-CoSe 2 @SiC的电化学反应机理和结构可逆性。并且理论计算揭示了电荷的重新分布和最强的Na +吸附来自 c/o-CoSe 2相结处的电解质。相结工程可以为开发高性能 SIB 和 PIB 提供一种新策略。
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