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具有优异碱(锂、钠、钾)离子存储性能的双壳层Co Se S@碳/石墨烯中空多面体的组成与结构设计

Composition and Architecture Design of Double-Shelled Co Se S @Carbon/Graphene Hollow Polyhedron with Superior Alkali (Li, Na, K)-Ion Storage.

作者信息

Wang Chunhui, Zhang Bao, Xia Haifeng, Cao Liang, Luo Bi, Fan Xinming, Zhang Jiafeng, Ou Xing

机构信息

National Engineering Laboratory for High Efficiency Recovery of Refractory Nonferrous Metals, School of Metallurgy and Environment, Central South University, Changsha, 410083, P. R. China.

出版信息

Small. 2020 Apr;16(17):e1905853. doi: 10.1002/smll.201905853. Epub 2020 Apr 6.

Abstract

The exploration of materials with reversible and stable electrochemical performance is crucial in energy storage, which can (de) intercalate all the alkali-metal ions (Li , Na , and K ). Although transition-metal chalcogenides are investigated continually, the design and controllable preparation of hierarchical nanostructure and subtle composite withstable properties are still great challenges. Herein, component-optimal Co Se S nanoparticles are fabricated by in situ sulfidization of metal organic framework, which are wrapped by the S-doped graphene, constructing a hollow polyhedron framework with double carbon shells (CoSSe@C/G). Benefiting from the synergistic effect of composition regulation and architecture design by S-substitution, the electrochemical kinetic is enhanced by the boosted electrochemistry-active sites, and the volume variation is mitigated by the designed structure, resulting in the advanced alkali-ion storage performance. Thus, it delivers an outstanding reversible capacity of 636.2 mAh g at 2 A g after 1400 cycles for Li-ion batteries. Remarkably, satisfactory initial charge capacities of 548.1 and 532.9 mAh g at 0.1 A g can be obtained for Na-ion and K-ion batteries, respectively. The prominent performance combined with the theory calculation confirms that the synergistic strategy can improve the alkali-ion transportation and structure stability, providing an instructive guide for designing high-performance anode materials for universal alkali-ion storage.

摘要

探索具有可逆且稳定电化学性能的材料在能量存储领域至关重要,这类材料能够(脱)嵌入所有碱金属离子(Li⁺、Na⁺和K⁺)。尽管过渡金属硫族化合物一直在被研究,但具有稳定性能的分级纳米结构和精细复合材料的设计与可控制备仍然面临巨大挑战。在此,通过金属有机框架的原位硫化制备了组分优化的CoSe₂S纳米颗粒,这些颗粒被硫掺杂的石墨烯包裹,构建了一种具有双碳壳的中空多面体框架(CoSSe@C/G)。受益于通过硫取代进行的成分调控和结构设计的协同效应,电化学活性位点的增加增强了电化学动力学,而设计的结构减轻了体积变化,从而产生了优异的碱离子存储性能。因此,对于锂离子电池,在2 A g的电流密度下经过1400次循环后,它具有636.2 mAh g的出色可逆容量。值得注意的是,对于钠离子电池和钾离子电池,在0.1 A g的电流密度下分别可获得548.1和532.9 mAh g的令人满意的初始充电容量。突出的性能与理论计算相结合证实,这种协同策略可以改善碱离子传输和结构稳定性,为设计用于通用碱离子存储的高性能负极材料提供了指导性的参考。

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