A chemically activated graphene-encapsulated LiFePO 4 composite for high-performance lithium ion batteries

Jeonghyun Ha, Seung Keun Park, Seung-Ho Yu, Aihua Jin, Byungchul Jang, Sungyool Bong, In Kim, Yung Eun Sung, Yuanzhe Piao

Research output: Contribution to journalArticle

93 Citations (Scopus)

Abstract

A composite of modified graphene and LiFePO 4 has been developed to improve the speed of charging-discharging and the cycling stability of lithium ion batteries using LiFePO 4 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 LiFePO 4 to prepare the composite. Microscopic observation and nitrogen sorption analysis have revealed the surface morphologies of CA-graphene and the CA-graphene/LiFePO 4 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/LiFePO 4 composite has exhibited better electrochemical properties than the conventional graphene/LiFePO 4 composite as well as bare LiFePO 4 , 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 LiFePO 4 particles. Owing to these properties of CA-graphene, LiFePO 4 could demonstrate enhanced and stably long-lasting electrochemical performance.

Original languageEnglish
Pages (from-to)8647-8655
Number of pages9
JournalNanoscale
Volume5
Issue number18
DOIs
Publication statusPublished - 2013 Sep 21
Externally publishedYes

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Graphene
Composite materials
Electrochemical properties
Cathodes
Lithium-ion batteries
Lithium
Surface morphology
Sorption
Charge transfer
Nitrogen
Agglomeration
Chemical activation
Ions

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

A chemically activated graphene-encapsulated LiFePO 4 composite for high-performance lithium ion batteries . / Ha, Jeonghyun; Park, Seung Keun; Yu, Seung-Ho; Jin, Aihua; Jang, Byungchul; Bong, Sungyool; Kim, In; Sung, Yung Eun; Piao, Yuanzhe.

In: Nanoscale, Vol. 5, No. 18, 21.09.2013, p. 8647-8655.

Research output: Contribution to journalArticle

Ha, J, Park, SK, Yu, S-H, Jin, A, Jang, B, Bong, S, Kim, I, Sung, YE & Piao, Y 2013, ' A chemically activated graphene-encapsulated LiFePO 4 composite for high-performance lithium ion batteries ', Nanoscale, vol. 5, no. 18, pp. 8647-8655. https://doi.org/10.1039/c3nr02738d
Ha, Jeonghyun ; Park, Seung Keun ; Yu, Seung-Ho ; Jin, Aihua ; Jang, Byungchul ; Bong, Sungyool ; Kim, In ; Sung, Yung Eun ; Piao, Yuanzhe. / A chemically activated graphene-encapsulated LiFePO 4 composite for high-performance lithium ion batteries In: Nanoscale. 2013 ; Vol. 5, No. 18. pp. 8647-8655.
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