A hierarchical structure of carbon-coated Li3VO4 nanoparticles embedded in expanded graphite for high performance lithium ion battery
A hierarchical structure of carbon-coated Li3VO4 nanoparticles embedded in expanded graphite for high performance lithium ion battery
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DOI：
10.1016/j.jpowsour.2015.11.015
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发表时间：
2016-01-30
影响因子：
9.2
通讯作者：
Xia, Yong-Yao
中科院分区：
文献类型：
--
作者：
Hu, Shuang;Song, Yanfang;Xia, Yong-Yao
采用溶胶-凝胶法制备了碳包覆的Li 3VO 4纳米颗粒，并将其均匀嵌入膨胀石墨中。在构建的架构中，膨胀石墨的高电子导电性充当负载载体，使电子器件能够快速传输。薄的外部碳壳保护Li 3VO 4纳米颗粒免于直接暴露于电解质，并减轻不必要的界面副反应。因此，与原始Li 3VO 4：在100 mA g（-1）下获得的可逆重量容量为405 mAh g（-1），200次循环后保持率为89%，并且在2000 mA g（-1）的大电流下在2000次循环后获得205.5 mAh g（-1），在6400 mA·g（-1）时，电池容量保持率为62.7%（vs.100 mA·g（-1））。(C)2015 Elsevier B. V.版权所有。
A hierarchical structure of carbon-coated Li3VO4 nanoparticles homogeneously embedded in expanded graphite was successfully synthesized by a facile and scalable sol gel method. In the constructed architecture, high electronic conductivity of expanded graphite serves as a loading carrier, enabling the fast transmission of electronics. The thin outside carbon shells protect the Li3VO4 nanoparticles from direct exposure to the electrolyte and mitigate unwanted interfacial side reactions. As a consequence, the hybrid material exhibits greatly enhanced cycle and rate capability compared with pristine Li3VO4: a reversible gravimetric capacity of 405 mAh g(-1) obtained at 100 mA g(-1) with 89% retention after 200 cycles, and 205.5 mAh g(-1) obtained after 2000 cycles at a heavy current of 2000 mA g(-1), as well as an remarkable rate performance of 62.7% capacity maintaining at 6400 mA g(-1) (vs. 100 mA g(-1)). (C) 2015 Elsevier B.V. All rights reserved.