Improving the Capacity Retention of LiCoO[sub 2] Cycled to 4.5 V by Heat-Treatment
- 1 January 2004
- journal article
- Published by The Electrochemical Society in Electrochemical and Solid-State Letters
- Vol. 7 (1) , A11-A14
- https://doi.org/10.1149/1.1628871
Abstract
Impedance growth of electrodes cycled with an upper cutoff potential of 4.5 V is caused by side reactions involving species on the surface of and -based electrolyte. These detrimental chemical species can apparently be removed by a heat-treatment to 550°C because electrodes made with heat-treated materials show excellent capacity retention even when cycled to 4.5 V. The detrimental surface species can be subsequently reformed on heat-treated materials by exposure of to water, suggesting prolonged air exposure is responsible for their formation on commercial samples. © 2003 The Electrochemical Society. All rights reserved.Keywords
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