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Impact of Li Grain Size on Coulombic Efficiency in Li Batteries.

Title: The Impact of Li Grain Size on Coulombic Efficiency in Li Batteries.
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Name(s): Mehdi, B Layla, author
Stevens, Andrew, author
Qian, Jiangfeng, author
Park, Chiwoo, author
Xu, Wu, author
Henderson, Wesley A, author
Zhang, Ji-Guang, author
Mueller, Karl T, author
Browning, Nigel D, author
Type of Resource: text
Genre: Journal Article
Text
Date Issued: 2016-10-05
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: One of the most promising means to increase the energy density of state-of-the-art lithium Li-ion batteries is to replace the graphite anode with a Li metal anode. While the direct use of Li metal may be highly advantageous, at present its practical application is limited by issues related to dendrite growth and low Coulombic efficiency, CE. Here operando electrochemical scanning transmission electron microscopy (STEM) is used to directly image the deposition/stripping of Li at the anode-electrolyte interface in a Li-based battery. A non-aqueous electrolyte containing small amounts of HO as an additive results in remarkably different deposition/stripping properties as compared to the "dry" electrolyte when operated under identical electrochemical conditions. The electrolyte with the additive deposits more Li during the first cycle, with the grain sizes of the Li deposits being significantly larger and more variable. The stripping of the Li upon discharge is also more complete, i.e., there is a higher cycling CE. This suggests that larger grain sizes are indicative of better performance by leading to more uniform Li deposition and an overall decrease in the formation of Li dendrites and side reactions with electrolyte components, thus potentially paving the way for the direct use of Li metal in battery technologies.
Identifier: FSU_pmch_27703188 (IID), 10.1038/srep34267 (DOI), PMC5050435 (PMCID), 27703188 (RID), 27703188 (EID), srep34267 (PII)
Publication Note: This NIH-funded author manuscript originally appeared in PubMed Central at https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5050435.
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_pmch_27703188
Host Institution: FSU
Is Part Of: Scientific reports.
2045-2322
Issue: vol. 6

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Mehdi, B. L., Stevens, A., Qian, J., Park, C., Xu, W., Henderson, W. A., … Browning, N. D. (2016). The Impact of Li Grain Size on Coulombic Efficiency in Li Batteries. Scientific Reports. Retrieved from http://purl.flvc.org/fsu/fd/FSU_pmch_27703188