Journal
JOURNAL OF POWER SOURCES
Volume 195, Issue 13, Pages 4290-4296Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2010.01.068
Keywords
Li-ion battery; Nanocomposite; Multiwalled carbon nanotube; Cyclic performance; Discharge capacity
Funding
- FINETEX-HKUST R D Center [FTG001-MECH.07/08]
- Hong Kong SAR [GHP/028/08SZ]
Ask authors/readers for more resources
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. (C) 2010 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available