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Crystal structure studies of thermally aged LiCoO_2 and LiMn_2O_4 cathodes

Gabrisch, Heike and Ozawa, Yasunori and Yazami, Rachid (2006) Crystal structure studies of thermally aged LiCoO_2 and LiMn_2O_4 cathodes. Electrochimica Acta, 52 (4). pp. 1499-1506. ISSN 0013-4686. doi:10.1016/j.electacta.2006.02.050.

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LiCoO_2 and LiMn_2O_4 cathodes were studied by X-ray diffractometry (XRD) and electron diffraction after ageing in the charged state at elevated temperature. Some cathodes were stopped at different times during ageing and XRD measurements were taken to monitor changes in the crystal structure over ageing time. The results indicate that Li-ions intercalate into the cathodes lattice during ageing thus decreasing the available discharge capacity. Analysis of electron diffraction patterns of LiCoO_2 and LiMn_2O_4 retrieved from the cathodes after ageing shows that irreversible crystallographic transformations have taken place in both electrodes. Dark field imaging illustrates that LiCoO_2 forms a layer of spinel phase on its surface. In LiMn_2O_4 a tetragonal distorted spinel is observed when the cathode has been in the 3 V regime for considerable length of time.

Item Type:Article
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Yazami, Rachid0000-0002-0085-5012
Additional Information:© 2006 Elsevier Ltd. Received 20 October 2005; received in revised form 5 February 2006; accepted 24 February 2006 Available online 22 May 2006. This work has been supported through grants HR0011-04-1-0029 from DARPA, DMR-0315579 from NSF and by DOE through Basic Energy Sciences Grant DE-FG03-00ER15035. The authors thank ENAX Co. Japan for providing the cathodes.
Funding AgencyGrant Number
Defense Advanced Research Projects Agency (DARPA)HR0011-04-1-0029
Department of Energy (DOE) Basic Energy SciencesDE-FG03-00ER15035
Subject Keywords:rechargeable Li-ion batteries; self discharge; LiMn2O4; LiCoO2; electron diffraction
Issue or Number:4
Record Number:CaltechAUTHORS:20110411-072345546
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Official Citation:Heike Gabrisch, Yasunori Ozawa, Rachid Yazami, Crystal structure studies of thermally aged LiCoO2 and LiMn2O4 cathodes, Electrochimica Acta, Volume 52, Issue 4, ELECTROCHEMICAL ENERGY CONVERSION AND STORAGE - ISE MEETING 2005 - Selection of papers from the 56th Annual Meetingof the International Society of Electrochemistry25-30 September 2005, Busan, Korea, 1 December 2006, Pages 1499-1506, ISSN 0013-4686, DOI: 10.1016/j.electacta.2006.02.050. (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:23262
Deposited By: Ruth Sustaita
Deposited On:12 Apr 2011 15:15
Last Modified:09 Nov 2021 16:12

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