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Anode-free lithium metal batteries(AFLMBs)are regarded as a promising candidate for next-generation batteries due toa great enhancement of energy density over lithium metal anode batteries. However, unstable solid-electrolyte interface(SEI)formation accompanied by lithium dendrite growth and electrolyte decomposition causes low Coulombic efficiencies. This study explores the effect of different operating potential ranges on SEI layer structure and further on Li plating/stripping efficiency in the dilute LiTFSI/TEGDME electrolyte in an AFLMB anode half-cell configuration. Cyclic voltammetry analyses reveal the existence of an “oxidative subsequent SEI” formation process(named as OSS)and the improved Li plating/stripping efficiency by blocking reaction OSS, which is further verified by quartz crystal microbalance analysis regarding the insight of such an improvement. XPS depth-profile analysis confirms the formation of theLi2O-and lithium-sulfur compounds-based subsequent SEI layers when the OSS process is blocked, which guarantees the improved stability of Li plating/stripping. A hypothesis is proposed to discuss possible electrochemical reactions via OSS process by combining in situ surface-enhanced Raman spectroscopy analysis. These results together suggested the importance of adjusting operating potential range in a proper manner to achieve a better performance in Li plating/stripping in AFLMB configuration.

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• In Copyright
  This is the peer reviewed version of the following article: Li Plating/Stripping Efficiency in Ether-based Dilute Electrolyte for Anode-free Lithium-metal Batteries: Effect of Operating Potential Range on Subsequent SEI Layer Structure, which has been published in final form at https://doi.org/10.1002/batt.202300359. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.

Keyword: Anode-free lithium metal battery, TEGDME, Li plating/stripping efficiency, SEI layer structure

Date published: 2023-10-26

Publisher: Wiley

Journal:

• Batteries & Supercaps (ISSN: 25666223) vol. 6 issue. 12 e202300359

Funding:

• National Institute for Materials Science

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4778

First published URL: https://doi.org/10.1002/batt.202300359

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Updated at: 2024-10-10 16:30:37 +0900

Published on MDR: 2024-10-10 16:30:37 +0900