TiO2 coating for long-cycling LiCoO2: A comparison of coating procedures
IR@CECRI: CSIR-Central Electrochemical Research Institute, Karaikudi
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| Title |
TiO2 coating for long-cycling LiCoO2: A comparison of
coating procedures
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| Creator |
Feb, G.T.
Lu, C.Z. Premkumar, T. Chang, Y.C. |
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| Subject |
Lithium batteries
Nanotechnology |
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| Description |
The cycling properties of LiCoO2 coated with TiO2 by a sol–gel process from an alkoxide precursor and a mechano-thermal process from
pre-formed nanoparticles are compared. Electron microscopic images of 1.0 wt.% TiO2-coated particles revealed that the oxide formed a
compact coating over the cathode particles. XRD studies showed a general decrease in the value of the lattice parameter c upon coating,
indicating that substitutional compounds might have formed on the surface during calcination. R-factor values from XRD studies and
galvanostatic charge–discharge studies suggested that a coating level of 1.0 wt.% was optimal for materials with good cycling characteristics.
While the sol–gel coating process enhanced cyclability 5-fold, the mechano-thermal process yielded materials that exhibited a 12-fold
improvement. The enhanced cyclability is attributed to a suppression of the cycle-limiting hexagonal/monoclinic/hexagonal phase transitions
accompanying the charge–discharge processes. Materials with better electrochemical characteristics could be obtained by the mechanothermally
coating process than sol–gel. Furthermore, the mechano-thermal coating process is a simple, inexpensive, environmentally benign
and commercially viable one for the production of high-cycling LiCoO2 cathode materials.
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| Publisher |
Elsevier
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| Date |
2005
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://cecri.csircentral.net/189/1/097-2005.pdf
Feb, G.T. and Lu, C.Z. and Premkumar, T. and Chang, Y.C. (2005) TiO2 coating for long-cycling LiCoO2: A comparison of coating procedures. Surface & Coatings Technology, 199 (1). pp. 22-31. ISSN 0257-8972 |
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| Relation |
http://cecri.csircentral.net/189/
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