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Edge-enriched MoS 2 @C/rGO film as self-standing anodes for high-capacity and long-life lithium-ion batteries
Science China Materials ( IF 6.8 ) Pub Date : 2020-05-29 , DOI: 10.1007/s40843-020-1348-y
Ling Chen , Yu Liu , Zongnan Deng , Hao Jiang , Chunzhong Li

Restraining the aggregation and polysulfide dissolution of edge-enriched metal sulfides is of significance for their applications as anode materials of lithium-ion batteries (LIBs) with high capacity and long cycle-life. In this work, we have reported the incorporation of MoS2 nanocrystals into amorphous carbon on the surface of reduced graphene oxide (rGO) by balancing the decomposition rates of phenolic resin (PF)-impregnated ammonium thiomolybdate (ATM), which subsequently forms the MoS2@C/rGO film through redispersion and vacuum filtration. Such structural design effectively avoids the aggregation of MoS2 nanocrystals and Li2S loss, and meanwhile ion enrichment in amorphous carbon and diffusion reinforcement can greatly accelerate the electrochemical reaction kinetics. When applied as the self-standing anode, the MoS2@C/rGO film possesses high reversible capacities of 1164 mA h g−1 at the current density of 0.2 A g−1 and 810 mA h g−1 at 6.4 A g−1. It also exhibits quite a high capacity retention after 1000 cycles at 3.2 A g−1. This work develops the formation theory of incorporation structures and promotes their applications in energy storage devices.



中文翻译:

边缘富集的MoS 2 @ C / rGO薄膜作为自支撑阳极,用于大容量和长寿命的锂离子电池

限制富边缘金属硫化物的聚集和多硫化物溶解对于将其用作高容量和长寿命的锂离子电池(LIB)负极材料具有重要意义。在这项工作中,我们报告了通过平衡酚醛树脂(PF)浸渍的硫代钼酸铵(ATM)的分解速率,将MoS 2纳米晶体掺入还原的氧化石墨烯(rGO)表面的无定形碳中。2 @ C / rGO膜通过再分散和真空过滤。这种结构设计有效地避免了MoS 2纳米晶体和Li 2的聚集。S损失,同时无定形碳中的离子富集和扩散增强可以极大地加速电化学反应动力学。当用作自立阳极时,MoS 2 @ C / rGO薄膜在0.2 A g -1的电流密度下具有1164 mA hg -1的高可逆容量,在6.4 A g -1的电流密度下具有810 mA hg -1的高可逆容量。在3.2 A g -1下1000次循环后,它还显示出相当高的容量保持率。这项工作发展了结合结构的形成理论,并促进了其在储能装置中的应用。

更新日期:2020-05-29
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