|Author||Fey, G. T. ♦ Chen, J. G. ♦ Premkumar, T.|
|Source||CSIR-Central Electrochemical Research Institute|
|Subject Domain (in DDC)||Technology ♦ Engineering & allied operations ♦ Applied physics|
|Subject Keyword||Lithium batteries|
|Abstract||LiCoO2 cathodes coated with Al2O3 derived from carboxylate-alumoxanes have been shown to possess improved cyclability. The carboxylate-alumoxanes were prepared by reacting pseudo-boehmite with acetic and substituted acetic acids. TEM images of the coated powders revealed that the alumina formed a compact kernel of thickness averaging about 20 nm. XRD data on the coated materials suggested the formation of solid solutions of the composition LiAlyCo1−yO2 on the surface, a conclusion attested by ESCA depth profiles. Galvanostatic cycling studies suggested that a coating formed from (methoxyethoxy)acetate-alumoxane enhanced the cyclability 13-fold. The improved cyclability is attributed to suppression of the cycle-limiting phase transitions accompanying the charge–discharge processes. The coating procedure based on carboxylate-alumoxanes is economical and environmentally benign, features attractive for industrial exploitation. � 2005 Elsevier B.V. All rights reserved.|
|Education Level||UG and PG|
|Learning Resource Type||Article|
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