Chinese Journal of Applied Chemistry ›› 2017, Vol. 34 ›› Issue (6): 712-722.DOI: 10.11944/j.issn.1000-0518.2017.06.160357

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Synthesis and Properties of Lithium Vanadium Phosphates/Reduced Graphene Oxide Composite as Cathode Materials

JIAO Lianshengabc,MENG Lingjuc,WU Tongshuna,LI Fenghuaa,NIU Liad*()   

  1. aState Key Laboratory of Electroanalytical Chemistry,c/o Engineering Laboratory for Modern Analytical Techniques,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China
    bUniversity of Chinese Academy of Sciences,Beijing 100049,China
    cDepartment of Chemistry,Hebei Normal University for Nationalities,Chengde,Hebei 067000,China
    dSchool of Chemistry & Chemical Engineering,Linyi University,Linyi,Shandong 276005,China;
  • Received:2016-09-06 Accepted:2016-12-02 Published:2017-05-31 Online:2017-05-31
  • Contact: NIU Li
  • Supported by:
    Supported by the National Science Fund for Distinguished Young Scholars NSFC(No.21225524), Fund for Major Research Instruments and Equipment Development NSFC(No.215278106), the Taishan Scholar Project(No.ts201511058).

Abstract:

Lithium vanadium phosphate(Li3V2(PO4)3)/reduced graphene oxide(rGO) composite has been successfully synthesized by incorporating melamine resin(MR) functionalized GO precursor into the Li3V2(PO4)3 solution and the subsequent heat treatment. The structural and electrochemical properties of Li3V2(PO4)3/rGO were characterized. The results show that Li3V2(PO4)3/rGO composite has monoclinic system, restacking of graphene layers and agglomeration of Li3V2(PO4)3 particles have been greatly inhibited, electrochemical performance of the composite has been improved. The as-obtained Li3V2(PO4)3/rGO was used as the cathode material in lithium ion batteries. The very low degree of polarization in the curve shows that electron and ion transports are facile, thus good rate and cycle behavior are observed. A considerably high lithiation capacity of 86 mA·h/g can be retained even at 20 C in the range of 3.0~4.3 V. After 100 cycles at 0.1 C, a discharge capacity of 119.7 mA·h/g could be delivered with the capacity retention of 94%. When the cells are operated between the voltage limits of 3.0~4.8 V vs.Li+/Li, a lithiation capacity of 80 mA·h/g at 10 C and 145.6 mA·h/g at 0.1 C after 100 cycles could be retained. Good cycling and rate performances, together with low carbon content, will be satisfactory for use as cathode material in lithium ion batteries.

Key words: lithium vanadium phosphate, graphene, electrode material, electrochemical performance