通过硅烷分解法制备锂离子电池 C/Six/C 负极材料过程中碳载体宏观结构的影响

IF 5.5 3区 材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY
Kyeong Nan Kim, Seok Chang Kang, Sang Wan Seo, Deok Jae Seo, Ji Sun Im, Soo Hong Lee, Jong Yeul Seog
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引用次数: 0

摘要

硅基阳极因其高容量而有望成为石墨的替代品。然而,它们的实际应用受到循环过程中严重的体积膨胀的阻碍。在此,我们建议使用碳支撑物来解决这一难题,并将硅基负极材料用于锂离子电池(LIB)。具体来说,我们通过 KOH 和 NaOH 活化沥青,制备了具有各种孔隙结构的碳支撑物。此外,还通过 SiH4 化学气相沉积(CVD)将硅沉积到碳支撑孔隙中,并通过 CH4 化学气相沉积进行碳涂层,以提高导电性和机械稳定性。对 C/Si/C 复合材料的电化学性能进行了评估,深入了解了它们的容量保持率、循环稳定性、速率能力和锂离子扩散系数。值得注意的是,所使用的活化剂不同,碳支持物的宏观结构也大不相同。更重要的是,碳衬底的宏观结构会显著影响硅的沉积行为,并通过减缓硅颗粒的体积膨胀来提高稳定性。这项研究阐明了碳支撑的宏观结构在优化锂电池硅基负极材料中的关键作用,为设计和开发高性能储能系统提供了宝贵的指导。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Effects of macrostructure of carbon support in preparation of C/Six/C anode materials for lithium-ion batteries via silane decomposition

Effects of macrostructure of carbon support in preparation of C/Six/C anode materials for lithium-ion batteries via silane decomposition

Si-based anodes are promising alternatives to graphite owing to their high capacities. However, their practical application is hindered by severe volume expansion during cycling. Herein, we propose employing a carbon support to address this challenge and utilize Si-based anode materials for lithium-ion batteries (LIBs). Specifically, carbon supports with various pore structures were prepared through KOH and NaOH activation of the pitch. In addition, Si was deposited into the carbon support pores via SiH4 chemical vapor deposition (CVD), and to enhance the conductivity and mechanical stability, a carbon coating was applied via CH4 CVD. The electrochemical performance of the C/Si/C composites was assessed, providing insights into their capacity retention rates, cycling stability, rate capability, and lithium-ion diffusion coefficients. Notably, the macrostructure of the carbon support differed significantly depending on the activation agent used. More importantly, the macrostructure of the carbon support significantly affected the Si deposition behavior and enhanced the stability by mitigating the volume expansion of the Si particles. This study elucidated the crucial role of the macrostructure of carbon supports in optimizing Si-based anode materials for LIBs, providing valuable guidance for the design and development of high-performance energy-storage systems.

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来源期刊
Carbon Letters
Carbon Letters CHEMISTRY, MULTIDISCIPLINARY-MATERIALS SCIENCE, MULTIDISCIPLINARY
CiteScore
7.30
自引率
20.00%
发文量
118
期刊介绍: Carbon Letters aims to be a comprehensive journal with complete coverage of carbon materials and carbon-rich molecules. These materials range from, but are not limited to, diamond and graphite through chars, semicokes, mesophase substances, carbon fibers, carbon nanotubes, graphenes, carbon blacks, activated carbons, pyrolytic carbons, glass-like carbons, etc. Papers on the secondary production of new carbon and composite materials from the above mentioned various carbons are within the scope of the journal. Papers on organic substances, including coals, will be considered only if the research has close relation to the resulting carbon materials. Carbon Letters also seeks to keep abreast of new developments in their specialist fields and to unite in finding alternative energy solutions to current issues such as the greenhouse effect and the depletion of the ozone layer. The renewable energy basics, energy storage and conversion, solar energy, wind energy, water energy, nuclear energy, biomass energy, hydrogen production technology, and other clean energy technologies are also within the scope of the journal. Carbon Letters invites original reports of fundamental research in all branches of the theory and practice of carbon science and technology.
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