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Unravelling the impact of reaction paths on mechanical degradation of intercalation cathodes for lithium-ion batteries [electronic resource].

Published:
Washington, D.C. : United States. Dept. of Energy. Office of Science, 2015.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description:
pages 13,732-13,735 : digital, PDF file
Additional Creators:
Oak Ridge National Laboratory, United States. Department of Energy. Office of Science, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary:
The intercalation compounds are generally considered as ideal electrode materials for lithium-ion batteries thanks to their minimum volume expansion and fast lithium ion diffusion. However, cracking still occurs in those compounds and has been identified as one of the critical issues responsible for their capacity decay and short cycle life, although the diffusion-induced stress and volume expansion are much smaller than those in alloying-type electrodes. Here, we designed a thin-film model system that enables us to tailor the cation ordering in LiNi0.5Mn1.5O4 spinels and correlate the stress patterns, phase evolution, and cycle performances. Surprisingly, we found that distinct reaction paths cause negligible difference in the overall stress patterns but significantly different cracking behaviors and cycling performances: 95% capacity retention for disordered LiNi0.5Mn1.5O4 and 48% capacity retention for ordered LiNi0.5Mn1.5O4 after 2000 cycles. We were able to pinpoint that the extended solid-solution region with suppressed phase transformation attributed to the superior electrochemical performance of disordered spinel. Furthermore, this work envisions a strategy for rationally designing stable cathodes for lithium-ion batteries through engineering the atomic structure that extends the solid-solution region and suppresses phase transformation.
Report Numbers:
E 1.99:1246774
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Note:
Published through SciTech Connect.
10/18/2015.
"KC0203020"
"ERKCZ06"
Journal of the American Chemical Society 137 43 ISSN 0002-7863 AM
Juchuan Li; Qinglin Zhang; Xingcheng Xiao; Yang -Tse Cheng; Chengdu Liang; Nancy J. Dudney.
Funding Information:
AC05-00OR22725
View MARC record | catkey: 23765665