Sol-gel synthesis of multiwalled carbon nanotube-LiMn2O4 nanocomposites as cathode materials for Li-ion batteries

Xian Ming Liu, Zheng Dong Huang, Seiwoon Oh, Peng Cheng Ma, Philip C.H. Chan, Ganesh Kumar Vedam, Kisuk Kang, Jang Kyo Kim

Research output: Contribution to journalArticlepeer-review

113 Scopus citations

Abstract

This study reports the development of multiwalled carbon nanotube (MWCNT)-LiMn2O4 nanocomposites by a facile sol-gel method. The elemental compositions, surface morphologies and structures of the nanocomposites are characterized with a view to their use as cathode materials for Li-ion batteries. The results indicate that the nanocomposite consists of LiMn2O4 nanoparticles containing undamaged MWCNTs. The nanocomposites show high cycle performance with a remarkable capacity retention of 99% after 20 cycles, compared with LiMn2O4 nanoparticles with a 9% loss of the initial capacity after 20 cycles. Measurements of a.c. impedance show that the charge-transfer resistance of the nanocomposites is much lower than that of spinel LiMn2O4. A cyclic voltammetry study further confirms higher reversibility of the nanocomposites compared with LiMn2O4 particles. The enhanced electrochemical performance of the nanocomposites is attributed to the formation of conductive networks by MWCNTs that act as intra-electrode wires, thereby facilitating charge-transfer among the spinel LiMn2O4 particles.

Original languageBritish English
Pages (from-to)4290-4296
Number of pages7
JournalJournal of Power Sources
Volume195
Issue number13
DOIs
StatePublished - 1 Jul 2010

Keywords

  • Cyclic performance
  • Discharge capacity
  • Li-ion battery
  • Multiwalled carbon nanotube
  • Nanocomposite

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