期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 21, 期 10, 页码 3353-3358出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0jm03287e
关键词
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资金
- Chinese Academy of Sciences [KGCX2-YW-231-4, KGCX2-YW-365]
- Ningbo Municipality [2009B21005]
- Zhejiang Provincial Natural Science Foundation of China [R4100194, Y4100499]
- Natural Science Foundation of Ningbo [2009A610046, 2009A610029]
- US DOE/BES [DE-AC02-98CH10886]
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 g(-1) at 60C discharge rate and showed a capacity decay rate of <15% when cycled under 10C charging and 20C discharging for 1000 times.
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