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    谢飞, 胡彦杰, 李云峰, 江浩, 李春忠. Li3VO4/RGO纳米复合负极材料的制备及其电化学性能[J]. 华东理工大学学报(自然科学版), 2018, (1): 55-61. DOI: 10.14135/j.cnki.1006-3080.20170308004
    引用本文: 谢飞, 胡彦杰, 李云峰, 江浩, 李春忠. Li3VO4/RGO纳米复合负极材料的制备及其电化学性能[J]. 华东理工大学学报(自然科学版), 2018, (1): 55-61. DOI: 10.14135/j.cnki.1006-3080.20170308004
    XIE Fei, HU Yan-jie, LI Yun-feng, JIANG Hao, LI Chun-zhong. Preparation and Electrochemical Performance of Li3VO4/Reduced Graphene Oxide Nanocomposite Anode Material[J]. Journal of East China University of Science and Technology, 2018, (1): 55-61. DOI: 10.14135/j.cnki.1006-3080.20170308004
    Citation: XIE Fei, HU Yan-jie, LI Yun-feng, JIANG Hao, LI Chun-zhong. Preparation and Electrochemical Performance of Li3VO4/Reduced Graphene Oxide Nanocomposite Anode Material[J]. Journal of East China University of Science and Technology, 2018, (1): 55-61. DOI: 10.14135/j.cnki.1006-3080.20170308004

    Li3VO4/RGO纳米复合负极材料的制备及其电化学性能

    Preparation and Electrochemical Performance of Li3VO4/Reduced Graphene Oxide Nanocomposite Anode Material

    • 摘要: 钒酸锂作为锂离子电池负极材料,因具有比碳材料更高的安全性能和比钛酸锂材料更高的能量密度,成为近年来的研究热点,但导电性能差是限制其应用的主要瓶颈。为了改善钒酸锂材料的导电性,提高其比容量和倍率性能,设计构筑了具有三维结构的Li3VO4/RGO(还原氧化石墨烯)复合负极材料。结果表明,RGO可以抑制Li3VO4颗粒的团聚,典型产物中Li3VO4颗粒粒径为50~200 nm,均匀地分散在RGO的表面,与RGO形成良好的三维网络结构。600℃煅烧后的样品(Li3VO4/RGO-600)在0.5 C的电流密度下首次放电比容量达到495.6(mA·h)/g,100次循环后保有365.9(mA·h)/g;在10 C的电流密度下,放电比容量仍可保持332.9(mA·h)/g。

       

      Abstract: The development of lithium-ion batteries (LIBs) possessing the satisfactory capacity and energy density is critical for many new energy applications, such as portable electronics and electric vehicles (EVs). Although the current LIBs have demonstrated substantial success in widespread applications and commercialization, challenges still exist in situations that require high rate charge/discharge processes and have high risk in serving as power resource of EVs and hybrid EVs. Commercial anode materials have been dominated by graphite for nearly 20 years, however, owing to the low working voltage of graphite (0.2 V vs. Li+/Li), they suffer from potential safety issues of dendritic lithium formation and side reactions caused by the solid electrolyte interphase (SEI) layer on its surface. Hence, a new anode material with appropriate working voltage and high energy density simultaneously will be desirable. Li3VO4 (LVO) has been known as an excellent ion conduction material and optical material for many years, and it has demonstrated great potential as anode material of LIBs as well. Compared to Li4Ti5O12 and graphite, LVO, an intercalation type material, has an appropriate and safe working voltage range (0.5-1.0 V vs. Li+/Li), which prevents the high risk of graphite and the sacrifice of energy density and overall battery voltage. Meanwhile, LVO experiences small volume change during lithiation/delithiation process and possesses a relatively high theoretical capacity of 400 (mA·h)/g, corresponding to two lithium ions intercalated in LVO and shifted to Li3+xVO4 (x=2). Nonetheless, the practical use of LVO still faces an obstacle, the low electrical conductivity. In this paper, in order to improve its capacity and rate performance, Li3VO4/RGO nanocomposites with three-dimension network structures were successfully prepared by drying method. The primary Li3VO4 particle's diameter is about 50-200 nm and dispersed on the surfaces of RGO nanosheets uniformly. After calcination at temperature of 600℃, the typical samples showed excellent electrochemical performance. Li3VO4/RGO-600 electrode achieved a high discharge specific capacity of 495.6 (mA·h)/g at 0.5 C and maintained 365.9 (mA·h)/g after 100 cycles; Even at a high current density of 10 C, it still delivered a superior capacity of 332.9 (mA·h)/g.

       

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