Electronic conductivity of LiCoO{sub 2} and its enhancement by magnesium doping
Journal Article
·
· Journal of the Electrochemical Society
- Univ. of Aberdeen (United Kingdom). Dept. of Chemistry
LiCoO{sub 2} the active cathode material in commercial rechargeable lithium batteries, is shown to be a p-type semiconductor, associated with the presence of a small concentration of CO{sup 4+} ions. Its conductivity at room temperature can be increased by over two orders of magnitude, to {approximately}0.5 S/cm, by partial substitution of CO{sup 3+} by Mg{sup 2+} and compensating hole creation. The electrochemical performance of LiMg{sub 0.05} Co{sub 0.95}O{sub 2} is comparable to that of LiCoO{sub 2}; a small reduction in capacity, associated with a reduction in Co{sup 3+} content, occurs but good reversibility is retained and, in contrast to LiCoO{sub 2}, the Mg-doped material is single phase throughout the charge/discharge cycle.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 556848
- Journal Information:
- Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 9 Vol. 144; ISSN JESOAN; ISSN 0013-4651
- Country of Publication:
- United States
- Language:
- English
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