Journal
NANOSCALE
Volume 5, Issue 18, Pages 8647-8655Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3nr02738d
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Funding
- Center for Integrated Smart Sensors
- Ministry of Science, ICT & Future Planning as Global Frontier Project [CISS-2012M3A6A6054186]
- National Research Foundation of Korea (NRF)
- Ministry of Education, Science and Technology [2012-0008330]
- Research Center Program of the Institute for Basic Science (IBS) in Korea
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A composite of modified graphene and LiFePO4 has been developed to improve the speed of charging-discharging and the cycling stability of lithium ion batteries using LiFePO4 as a cathode material. Chemically activated graphene (CA-graphene) has been successfully synthesized via activation by KOH. The as-prepared CA-graphene was mixed with LiFePO4 to prepare the composite. Microscopic observation and nitrogen sorption analysis have revealed the surface morphologies of CA-graphene and the CA-graphene/LiFePO4 composite. Electrochemical properties have also been investigated after assembling coin cells with the CA-graphene/LiFePO4 composite as a cathode active material. Interestingly, the CA-graphene/LiFePO4 composite has exhibited better electrochemical properties than the conventional graphene/LiFePO4 composite as well as bare LiFePO4, including exceptional speed of charging-discharging and excellent cycle stability. That is because the CA-graphene in the composite provides abundant porous channels for the diffusion of lithium ions. Moreover, it acts as a conducting network for easy charge transfer and as a divider, preventing the aggregation of LiFePO4 particles. Owing to these properties of CA-graphene, LiFePO4 could demonstrate enhanced and stably long-lasting electrochemical performance.
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