Journal
JOURNAL OF POWER SOURCES
Volume 195, Issue 13, Pages 4255-4265Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2010.01.040
Keywords
Lithium cobalt oxide; Zirconia coating; Stability; High voltage; Lithium ion battery; Cathode
Funding
- National Science Council (NSC, Taiwan) [98-ET-E-011-003-ET]
- National Synchrotron Radiation Research Center (NSRRC, Taiwan)
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In this study, the mechanism of enhanced performance of ZrO2-coated LiCoO2 especially at high potential range is systematically investigated. Firstly, when overcharging to 4.5 V (higher than 4.2 V. the normal cutoff charging potential), phase transformation from H1 to H2 takes place with less volume expansion for ZrO2-coated LiCoO2 (1.2% and 2.2% for as-received one). EIS analysis indicates the growth of interfacial impedance during charging/discharging can be effectively suppressed with ZrO2 coating on the LiCoO2 surface. It is demonstrated as well that cation mixing of the cycled LiCoO2 caused by re-intercalation of dissolved Co2+ is inhibited with the ZrO2 coating on the LiCoO2. Therefore the ZrO2-coated LiCoO2 shows great enhancement in the electrochemical properties with 85% capacity retention after 30 cycles from 3 to 4.5 ZrO2 at a rate of 0.5C. Nevertheless, under the same evaluation process, the as-received LiCoO2 possesses only 21% capacity retention, which is resulted from the formation of polymeric layers by the electrolyte decomposition on its surface, the higher volumetric changes during charging/discharging and possible cation mixing by re-intercalation of the dissolved Co2+. (C) 2010 Elsevier B.V. All rights reserved.
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