Journal
ELECTROCHIMICA ACTA
Volume 182, Issue -, Pages 1046-1052Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2015.10.036
Keywords
Li ion batteries; Cathode material; Li3V2(PO4)(3); Graphene; Electrical conductivity
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Funding
- Promotive Research Fund for Excellent Young Scientists of Shandong Province [BS2013NJ006]
- Science & Technology Youth-Star Program of Jinan Science & Technology Bureau [2013036]
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Li3V2(PO4)(3) (LVP) nanoparticles were first prepared via a simple sol-gel route, then deposited on graphene oxide nanosheets, and finally a composite of LVP/reduced graphene oxide (LVP/G) was obtained after heat treatment. Scanning electron microscope and transmission electron microscope images demonstrate that LVP nanoparticles are homogenously enwrapped into graphene nanosheets or anchored onto the surface of graphene nanosheets. Compared with pure LVP, LVP/G nanocomposites exhibited better electrochemical performance (118.4 mAhg(-1) at 1C, and 112.1 mAhg(-1) at 2C after 100 cycles) and higher cycling stability (97% capacity retention after 100 cycles at 1C, and 89.5% after 500 cycles at 20C) as cathode materials for Li ion batteries. The enhanced performance can be attributed to the presence of graphene nanosheets among LVP nanoparticles. Electrochemical impedance spectroscopy indicates that graphene nanosheets significantly improve the electrical conductivity of LVP. The as-prepared LVP/G nanocomposites with superior cycling performance at high-rate have potential applications as cathode materials in Li ion batteries. (C) 2015 Elsevier Ltd. All rights reserved.
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