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A novel graphene modified LiMnPO4 as a performance-improved cathode material for lithium-ion batteries

Published online by Cambridge University Press:  02 September 2013

Yong Jiang
Affiliation:
School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China
Ruizhe Liu
Affiliation:
School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China
Weiwen Xu
Affiliation:
School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China
Zheng Jiao
Affiliation:
School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China
Minghong Wu
Affiliation:
School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China
Yuliang Chu
Affiliation:
Instrumental Analysis and Research Center, Shanghai University, Shanghai 200444, China
Ling Su
Affiliation:
Shanghai Aerospace Power Technology Company Limited, Shanghai 201615, China
Hui Cao
Affiliation:
Shanghai Aerospace Power Technology Company Limited, Shanghai 201615, China
Ming Hou
Affiliation:
Shanghai Aerospace Power Technology Company Limited, Shanghai 201615, China
Bing Zhao*
Affiliation:
School of Environmental and Chemical Engineering, Shanghai University. Shanghai 200444, China
*Corresponding
a)Address all correspondence to this author. e-mail: bzhao@shu.edu.cn
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Abstract

A novel graphene-modified LiMnPO4 composite as a performance-improved cathode material for lithium-ion batteries has been prepared with LiH2PO4, Mn(CH3COO)2·4H2O, and graphite oxide (GO) suspension by spray-drying method. X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and galvanostatic charge–discharge tests are applied to characterize these materials. The structure analysis shows that LiMnPO4 sheets with width of 100–200 nm and thickness of 20–30 nm are attached to the graphene sheets in pieces. The graphene sheets with good electrical conductivity serve as a conducting network for fast electron transfer between the active materials and charge collector, as well as buffered spaces to accommodate the volume expansion/contraction during the discharge/charge process. The electrochemical tests show that the composite cathode material could deliver a capacity of 105.1 mAh/g at 0.05 C in the voltage range of 2.5–4.4 V. Moreover, the cells showed fair good cycle ability over 50 cycles.

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Articles
Copyright
Copyright © Materials Research Society 2013 

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