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나노입자 연구단
나노입자 연구단
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A chemically activated graphene-encapsulated LiFePO4 composite for high-performance lithium ion batteries

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Title
A chemically activated graphene-encapsulated LiFePO4 composite for high-performance lithium ion batteries
Author(s)
Ha J.H; Park S.K.; Seung-Ho Yu; Aihua Jin; Jang B.C; Bong S.Y; Kim I.; Yung-Eun Sung; Piao Y.
Publication Date
2013-09
Journal
NANOSCALE, v.5, no.18, pp.8647 - 8655
Publisher
ROYAL SOC CHEMISTRY
Abstract
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/LiFePO 4 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. © 2013 The Royal Society of Chemistry.
URI
https://pr.ibs.re.kr/handle/8788114/1262
ISSN
2040-3364
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > Journal Papers (저널논문)
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