Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/80761
Title: Insights into phase transformations and degradation mechanisms in aluminum anodes for lithium-Ion batteries
Authors: Tahmasebi, MH 
Kramer, D
Monig, R
Boles, ST 
Issue Date: 2018
Publisher: Electrochemical Society
Source: Journal of the Electrochemical Society, 27 Sept. 2018, v. 166, no. 3, p. A5001-A5007 How to cite?
Journal: Journal of the Electrochemical Society 
Abstract: Attempts to use aluminum-based anodes in lithium-ion batteries often fail due to fast capacity fading. Generally, this has been attributed to pulverization of the electrode and the large volume changes associated with the phase transformation between the crystalline alpha and beta phases of Li-Al alloys. In this study, these transformations were investigated in aluminum films that were lithiated either electrochemically or via direct reaction with lithium metal. Scanning electron microscopy was used to image the samples at different stages of (de)lithiation. By imaging the same locations before and after each step, it can be seen that alloying between Li and Al proceeds from distinct nucleation sites. In situ and ex situ observations reveal that the alpha-to-beta phase transformation is highly anisotropic and causes strong distortions of the film morphology, but only a relatively small amount of mechanical damage such as cracks and delamination. Comparisons between films that were lithiated to 70% and 100% of the theoretical capacity of LiAl indicate that the critical, irreversible damage is more dependent on depth of discharge than on the volume contraction caused by delithiation. Our observations challenge the pessimistic view that pulverization is unavoidable during the phase transformations of the Li-Al system.
URI: http://hdl.handle.net/10397/80761
ISSN: 0013-4651
EISSN: 1945-7111
DOI: 10.1149/2.0011903jes
Rights: © The Author(s) 2018. Published by ECS. This is an open access article distributed under the terms of the Creative CommonsAttribution Non-Commercial No Derivatives 4.0 License (CC BY-NC-ND,http://creativecommons.org/licenses/by-nc-nd/4.0/),which permits non-commercial reuse, distribution, and reproduction in any medium, provided the original work is not changed in anyway and is properly cited. For permission for commercial reuse, please email:oa@electrochem.org. [DOI:10.1149/2.0011903jes]
The following publication Tahmasebi, M. H., Kramer, D., Mönig, R., & Boles, S. T. (2019). Insights into Phase Transformations and Degradation Mechanisms in Aluminum Anodes for Lithium-Ion Batteries. Journal of The Electrochemical Society, 166(3), A5001-A5007 is available at https://dx.doi.org/10.1149/2.0011903jes
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