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説明:

Anode-free lithium metal batteries (AFLMBs) have attracted great attention owing to their higher energy density compared to conventional lithium metal batteries. Unfortunately, AFLMBs still suffer from poor Coulombic efficiency (CE) due to severe dendrite growth and the unstable solid–electrolyte interface (SEI) at the anode. Therefore, we explored the effect of concentration and LiNO3 additive on the SEI layer and on Li plating/stripping efficiency using a low-concentration tetraethylene glycol dimethyl ether (TEGDME)-based electrolyte in an AFLMB anode half-cell configuration. It was found that the formation of protective Li2O-based SEI layers when blocking the oxidative subsequent SEI formation (called ‘‘OSS’’) above 2.2 V vs. Li/Li+ improved Li plating/stripping stability, while the LiNO3 additive suppressed the oxidation of Li2O into Li2O2 and sustained the existence of Li2O without blocking OSS, therefore improving CE performance. Although increasing the concentration (from 0.4 M to 2.0 M) did not have a major effect, the 2.0 M electrolyte with LiNO3 additive shifted the dominant SEI species from Li2O to LiF, further enhancing CE performance.

権利情報:

• In Copyright
  

キーワード: Anode-free lithium metal battery, TEGDME, Li plating/stripping efficiency, SEI layer structure

刊行年月日: 2024-09-24

出版者: Royal Society of Chemistry (RSC)

掲載誌:

• PHYSICAL CHEMISTRY CHEMICAL PHYSICS (ISSN: 14639076) vol. 26 issue. 39 p. 25352-25362

研究助成金:

• National Institute for Materials Science

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4834

公開URL: https://doi.org/10.1039/D4CP02755H

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更新時刻: 2025-09-24 08:30:28 +0900

MDRでの公開時刻: 2025-09-24 08:23:30 +0900