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Microstructural stability of nanocrystalline LiCoO2 in lithium thin-film batteries under high-voltage cycling

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5 Author(s)
Li, Chiung-Nan ; Department of Materials Science and Engineering, University of California, Los Angeles, California 90095-1595 ; Yang, Jenn-Ming ; Krasnov, Victor ; Arias, Jeff
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The microstructural stability of nanocrystalline LiCoO2 cathodes in rechargeable thin-film batteries after high-voltage cycling was investigated by transmission electron microscopy. It was found that besides the trigonal-LiCoO2 phase, there are two other phases of LixCoO2, spinel and H1–3, that form inside the nanocrystalline cathode after electrochemical cycling (charge cutoff voltages ≧4.5 V). The formation of the aforementioned secondary phases in the cathode material is irreversible and leads to capacity loss in lithium thin-film batteries.

Published in:

Applied Physics Letters  (Volume:90 ,  Issue: 26 )

Date of Publication:

Jun 2007

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