Functionalization of MWCNTs by plasma treatment and use as conductive additives for LiFePO4 electrode

Si Xian Wu, Chih Lien Chiang, Cheng Chien Wang, Chuh-Yung Chen

Research output: Contribution to journalArticle

Abstract

The application of LiFePO4 in high power battery is limited by its low conductivity. MWCNTs as conductive additives were functionalized with maleic anhydride (MA) using the plasma-induced grafting technique. A series of LiFePO4/MWCNTs-MA composite electrodes with 1.7 wt%, 2.7 wt%, 4.7 wt%, and 9.7 wt% of MWCNTs-MA were fabricated to improve conductivity and to investigate the effects of MWCNTs-MA on LiFePO4 electrode performance. X-ray diffraction analysis of LiFePO4/MWCNTs-MA cathodes showed that crystallinity and lattice spacing of LiFePO4 were not altered by incorporation of MWCNTs-MA. Field-emission scanning electronic microscopy showed that 4.7 wt% MWCNTs-MA dispersed well in LiFePO4 particle matrix. Electrochemical impedance spectroscopy showed that charge transfer resistance was decreased by increased amount of MWCNTs-MA. The specific capacity, cyclic stability, and rate performance of LiFePO4 coin cells were enhanced by increased amount of MWCNTs-MA, and reaching optimal performance at 4.7 wt%. The LiFePO4/MWCNTs-MA (4.7 wt%) battery had rate capacity of 114 mAh g−1 at 1 C with a capacity retention ratio of 75.6% after 200 cycles.

Original languageEnglish
Pages (from-to)208-214
Number of pages7
JournalJournal of the Taiwan Institute of Chemical Engineers
Volume89
DOIs
Publication statusPublished - 2018 Aug 1

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Maleic Anhydrides
Maleic anhydride
Plasmas
Electrodes
LiFePO4
Electrochemical impedance spectroscopy
Field emission
X ray diffraction analysis
Charge transfer
Microscopic examination
Cathodes

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

Cite this

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title = "Functionalization of MWCNTs by plasma treatment and use as conductive additives for LiFePO4 electrode",
abstract = "The application of LiFePO4 in high power battery is limited by its low conductivity. MWCNTs as conductive additives were functionalized with maleic anhydride (MA) using the plasma-induced grafting technique. A series of LiFePO4/MWCNTs-MA composite electrodes with 1.7 wt{\%}, 2.7 wt{\%}, 4.7 wt{\%}, and 9.7 wt{\%} of MWCNTs-MA were fabricated to improve conductivity and to investigate the effects of MWCNTs-MA on LiFePO4 electrode performance. X-ray diffraction analysis of LiFePO4/MWCNTs-MA cathodes showed that crystallinity and lattice spacing of LiFePO4 were not altered by incorporation of MWCNTs-MA. Field-emission scanning electronic microscopy showed that 4.7 wt{\%} MWCNTs-MA dispersed well in LiFePO4 particle matrix. Electrochemical impedance spectroscopy showed that charge transfer resistance was decreased by increased amount of MWCNTs-MA. The specific capacity, cyclic stability, and rate performance of LiFePO4 coin cells were enhanced by increased amount of MWCNTs-MA, and reaching optimal performance at 4.7 wt{\%}. The LiFePO4/MWCNTs-MA (4.7 wt{\%}) battery had rate capacity of 114 mAh g−1 at 1 C with a capacity retention ratio of 75.6{\%} after 200 cycles.",
author = "Wu, {Si Xian} and Chiang, {Chih Lien} and Wang, {Cheng Chien} and Chuh-Yung Chen",
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Functionalization of MWCNTs by plasma treatment and use as conductive additives for LiFePO4 electrode. / Wu, Si Xian; Chiang, Chih Lien; Wang, Cheng Chien; Chen, Chuh-Yung.

In: Journal of the Taiwan Institute of Chemical Engineers, Vol. 89, 01.08.2018, p. 208-214.

Research output: Contribution to journalArticle

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