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Issue 10, 2011
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Graphene modified LiFePO4 cathode materials for high power lithium ion batteries

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Abstract

Graphene-modified LiFePO4 composite has been developed as a Li-ion battery cathode material with excellent high-rate capability and cycling stability. The composite was prepared with LiFePO4 nanoparticles and graphene oxide nanosheets by spray-drying and annealing processes. The LiFePO4 primary nanoparticles embedded in micro-sized spherical secondary particles were wrapped homogeneously and loosely with a graphene 3D network. Such a special nanostructure facilitated electron migration throughout the secondary particles, while the presence of abundant voids between the LiFePO4 nanoparticles and graphene sheets was beneficial for Li+ diffusion. The composite cathode material could deliver a capacity of 70 mAh gāˆ’1 at 60C discharge rate and showed a capacity decay rate of <15% when cycled under 10C charging and 20C discharging for 1000 times.

Graphical abstract: Graphene modified LiFePO4 cathode materials for high power lithium ion batteries

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Article information


Submitted
30 Sep 2010
Accepted
03 Dec 2010
First published
24 Jan 2011

J. Mater. Chem., 2011,21, 3353-3358
Article type
Paper

Graphene modified LiFePO4 cathode materials for high power lithium ion batteries

X. Zhou, F. Wang, Y. Zhu and Z. Liu, J. Mater. Chem., 2011, 21, 3353
DOI: 10.1039/C0JM03287E

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