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Manipulating Size of Li(3)V(2)(PO(4))(3) with Reduced Graphene Oxide: towards High-Performance Composite Cathode for Lithium Ion Batteries

Lithium vanadium phosphate (Li(3)V(2)(PO(4))(3), LVP)/reduced graphene oxide (rGO) composite is prepared with a rheological method followed by heat treatment. The size and interface of LVP particles, two important merits for a cathode material, can be effectively tuned by the rGO in the composite, w...

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Detalles Bibliográficos
Autores principales: Zhu, Xianjun, Yan, Zan, Wu, Wenyan, Zeng, Wencong, Du, Yuanxin, Zhong, Yu, Zhai, Haidie, Ji, Hengxing, Zhu, Yanwu
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5385827/
https://www.ncbi.nlm.nih.gov/pubmed/25169810
http://dx.doi.org/10.1038/srep05768
Descripción
Sumario:Lithium vanadium phosphate (Li(3)V(2)(PO(4))(3), LVP)/reduced graphene oxide (rGO) composite is prepared with a rheological method followed by heat treatment. The size and interface of LVP particles, two important merits for a cathode material, can be effectively tuned by the rGO in the composite, which plays as surfactant to assist sol-gelation and simultaneously as conductive carbon coating. As a consequence, the composite with 7.0 ± 0.4 wt.% rGO shows a capacity of 141.6 mAh g(−1) at 0.075 C, and a rate capacity of 119.0 mAh g(−1) at 15 C with respect to the mass of LVP/rGO composite, and an excellent cycling stability that retains 98.7% of the initial discharge capacity after 50 cycles. The improved electrochemical performance is attributed to the well-controlled rGO content that yields synergic effects between LVP and rGO. Not only do the rGO sheets reduce the size of LVP particles that favor the Li(+) ion migration and the electron transfer during charging and discharging, but also contribute to the reversible lithium ions storage.