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Graphene-modified LiFePO4 cathode material for high-power Li-ion batteries

A team from the Ningbo Institute of Material Technology & Engineering, Chinese Academy of Sciences has developed a graphene-modified LiFePO4 composite as a Li-ion battery cathode material with excellent high-rate capability and cycling stability. They report on the material in a paper in the RSC Journal of Materials Chemistry.

The composite cathode material delivers a capacity of 70 mAh g-1 at 60C discharge rate and shows a capacity decay rate of <15% when cycled under 10C charging and 20C discharging for 1,000 times.

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, they said.

Resources

  • Xufeng Zhou, Feng Wang, Yimei Zhu and Zhaoping Liu (2011) Graphene modified LiFePO4 cathode materials for high power lithium ion batteries. J. Mater. Chem. Advance Article doi: 10.1039/C0JM03287E

Comments

jcwinnie

This would be a good thing if not violating patent for the LiFePO4 batteries that Valence makes. There has been at least one previous patent fight about this advanced lithium battery material.

HarveyD

China will use whatever it wants for their local market. However, this is a far cry from the Valence patent. They could export such batteries without fear of being challenged by our hungry patent lawyers.

By 2020, China's internal market is going to be the largest of the whole world and that may put a limit to patent rights.

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