Abstract
The graphene/mesocarbon microbead (MCMB) composite is assessed as an anode material with a high capacity for lithium-ion batteries. The composite electrode exhibits improved cycling stability and rate capability, delivering a high initial charge/discharge capacity of 421.4 mA·h/g/494.8 mA·h/g as well as an excellent capacity retention over 500 cycles at a current density of 40 mA/g. At a higher current density of 800 mA/g, the electrode still retains 35% of its initial capacity which exceeds the capacity retention of pure graphene or MCMB reference electrodes. Cyclic voltammetry and electrochemical impedance spectroscopy reveal that the composite electrode favors electrochemical kinetics as compared with graphene and MCMB separately. Superior electrochemical properties suggest a strong synergetic effect between highly conductive graphene and MCMB.
目的
电动汽车和大规模储能的发展对锂离子电池的能 量密度提出了更高的要求,但现有商业石墨负极 容量难以满足要求。本文结合石墨烯高电导和高 容量的优点以及中间相碳微球材料循环稳定性 优良的优势,研究和报道一种容量高和循环性能 好的石墨烯/中间相碳微球复合负极材料。
方法:1. 通过选择高电导率石墨烯和中间相碳微球,制 备石墨烯和中间相碳微球复合负极材料。2. 选用 商业聚偏氟乙烯(PVDF)粘结剂,制备复合材 料电极极片,测试和表征电极的形貌、电导以及 半电池的充放电等电化学性能,并优化复合材料 质量比。3. 选择优化的复合负极材料(GMC (8:2)),研究其长循环性能。
结论:中间相碳微球的球形结构能有效防止石墨烯的折 叠团聚,从而发挥石墨烯的高电导性能。因此, 石墨烯/中间相碳微球复合负极材料表现出了 很好的倍率性能和循环性能,且其容量达到了 421 mA∙h/g 以上,高于商业石墨的理论容量,具 有潜在的应用前景。
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Inna SMOLIANOVA conducted research and prepared the paper; Jin-long HU and Xin-yue ZHAO helped for guidance of partial electrochemical tests; Viacheslav DEMENTIEV donated the graphene sample and initialized the collaboration of this research; Ling-zhi ZHANG is responsible for all the research and the publication of the paper including revision of manuscript and all communication during the whole process.
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Inna SMOLIANOVA, Jin-long HU, Xin-yue ZHAO, Viacheslav DEMENTIEV, and Ling-zhi ZHANG declare that they have no conflict of interest.
Project supported by the National Natural Science Foundation of China (No. 21573239), the Guangdong Provincial Project for Science and Technology (Nos. 2014TX01N14, 2015B010135008, and 2016B010114003), the Guangzhou Municipal Project for Science and Technology (No. 201509010018), and the K. C. WONG Education Foundation, China
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Smolianova, I., Hu, Jl., Zhao, Xy. et al. A high-capacity graphene/mesocarbon microbead composite anode for lithium-ion batteries. J. Zhejiang Univ. Sci. A 21, 392–400 (2020). https://doi.org/10.1631/jzus.A1900600
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DOI: https://doi.org/10.1631/jzus.A1900600