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Composition and Architecture Design of Double-Shelled Co0.85 Se1- x Sx @Carbon/Graphene Hollow Polyhedron with Superior Alkali (Li, Na, K)-Ion Storage.
Small ( IF 13.0 ) Pub Date : 2020-04-06 , DOI: 10.1002/smll.201905853
Chunhui Wang 1 , Bao Zhang 1 , Haifeng Xia 1 , Liang Cao 1 , Bi Luo 1 , Xinming Fan 1 , Jiafeng Zhang 1 , Xing Ou 1
Affiliation  

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 Co0.85 Se1- x Sx 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-1 at 2 A g-1 after 1400 cycles for Li-ion batteries. Remarkably, satisfactory initial charge capacities of 548.1 and 532.9 mAh g-1 at 0.1 A g-1 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.

中文翻译:

具有优质碱(锂,钠,钾)离子存储的双壳式Co0.85 Se1- x Sx @碳/石墨烯空心多面体的组成和架构设计。

对具有可逆且稳定的电化学性能的材料的探索在能量存储中至关重要,能量存储可以(嵌入)所有碱金属离子(Li +,Na +和K +)。尽管对过渡金属硫属元素化物的研究不断,但分级纳米结构和性能稳定的细微复合材料的设计和可控制备仍然是巨大的挑战。本文中,通过金属有机骨架的原位硫化制备了组分最佳的Co0.85 Se1- x Sx纳米颗粒,该有机骨架被S掺杂的石墨烯包裹,构建了具有双碳壳的空心多面体骨架(CoSSe @ C / G) 。受益于通过S取代进行组成调节和体系结构设计的协同效应,电化学动力学通过增强的电化学活性位而得以增强,设计结构减轻了体积变化,提高了碱离子存储性能。因此,在1400次循环后,对于锂离子电池,它在2 A g-1时可提供636.2 mAh g-1的出色可逆容量。值得注意的是,对于Na离子电池和K离子电池,分别在0.1 A g-1时可获得令人满意的548.1和532.9 mAh g-1的初始充电容量。出色的性能与理论计算相结合,证实了该协同策略可以改善碱离子的传输和结构稳定性,为设计通用碱离子存储用高性能负极材料提供指导。锂离子电池1400次循环后,在2 A g-1下为2 mAh g-1。值得注意的是,对于Na离子电池和K离子电池,分别在0.1 A g-1时可获得令人满意的548.1和532.9 mAh g-1的初始充电容量。出色的性能与理论计算相结合,证实了该协同策略可以改善碱离子的传输和结构稳定性,为设计通用碱离子存储用高性能负极材料提供指导。锂离子电池1400次循环后,在2 A g-1下为2 mAh g-1。值得注意的是,对于Na离子电池和K离子电池,分别在0.1 A g-1时可获得令人满意的548.1和532.9 mAh g-1的初始充电容量。出色的性能与理论计算相结合,证实了该协同策略可以改善碱离子的传输和结构稳定性,为设计通用碱离子存储用高性能负极材料提供指导。
更新日期:2020-04-06
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