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MoS/石墨烯纳米片纳米复合材料的电化学性能增强

Enhanced electrochemical performance of MoS/graphene nanosheet nanocomposites.

作者信息

Choi Jin-Hyeok, Kim Min-Cheol, Moon Sang-Hyun, Kim Hyeona, Kim Yo-Seob, Park Kyung-Won

机构信息

Department of Chemical Engineering, Soongsil University Seoul 06978 Republic of Korea

出版信息

RSC Adv. 2020 May 19;10(32):19077-19082. doi: 10.1039/d0ra03539d. eCollection 2020 May 14.

DOI:10.1039/d0ra03539d
PMID:35518332
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9053862/
Abstract

Molybdenum disulfide (MoS) is attractive as an anode material for next-generation batteries, because of its layered structure being favorable for the insertion/deinsertion of Li ions, and its fairly high theoretical capacity. However, since the MoS anode material has exhibited disadvantages, such as low electrical conductivity and poor cycling stability, to improve the electrochemical performance of MoS in this study, a nanocomposite structure consisting of MoS and GNS (MoS/GNS) as an anode for LIBs was prepared, by controlling the weight ratios of MoS/GNS. The X-ray diffraction patterns and electron microscopic analysis showed that the nanocomposite electrode structure consisted of well-formed MoS nanoparticles and GNS. Compared to MoS-only, the MoS/GNS composites exhibited high retention and improved capacity at high current densities. In particular, among these nanocomposite samples, MoS/GNS(8 : 2) with an appropriate portion of GNS exhibited the best LIB performance, due to the lowest interfacial resistance and highest Li-ion diffusivity.

摘要

二硫化钼（MoS）作为下一代电池的负极材料具有吸引力，因为其层状结构有利于锂离子的嵌入/脱嵌，且理论容量相当高。然而，由于MoS负极材料存在诸如电导率低和循环稳定性差等缺点，为了在本研究中改善MoS的电化学性能，通过控制MoS/GNS的重量比，制备了由MoS和石墨烯纳米片（GNS）组成的纳米复合结构作为锂离子电池的负极。X射线衍射图谱和电子显微镜分析表明，纳米复合电极结构由结构良好的MoS纳米颗粒和GNS组成。与仅含MoS的材料相比，MoS/GNS复合材料在高电流密度下表现出高保持率和改善的容量。特别是，在这些纳米复合样品中，具有适当比例GNS的MoS/GNS(8 : 2)表现出最佳的锂离子电池性能，这归因于最低的界面电阻和最高的锂离子扩散率。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/560c/9053862/15d1f08dd6c3/d0ra03539d-f9.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/560c/9053862/bb23d0561c87/d0ra03539d-f1.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/560c/9053862/889972299a78/d0ra03539d-f5.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/560c/9053862/7d30ebc70bbd/d0ra03539d-f7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/560c/9053862/3791715ec371/d0ra03539d-f8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/560c/9053862/15d1f08dd6c3/d0ra03539d-f9.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/560c/9053862/bb23d0561c87/d0ra03539d-f1.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/560c/9053862/f2efe496c991/d0ra03539d-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/560c/9053862/889972299a78/d0ra03539d-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/560c/9053862/f69d17203608/d0ra03539d-f6.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/560c/9053862/15d1f08dd6c3/d0ra03539d-f9.jpg

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