Volume 135, Issue 13 e202218151
Forschungsartikel

An Amphiphilic Molecule-Regulated Core-Shell-Solvation Electrolyte for Li-Metal Batteries at Ultra-Low Temperature

Junkai Shi

Junkai Shi

School of Chemistry, Guangzhou Key Laboratory of Materials for Energy Conversion and Storage, South China Normal University (SCNU), 55 West Zhongsan Rd., Guangzhou, 510006 China

These authors contributed equally to this work.

Contribution: Formal analysis (lead), ​Investigation (lead), Writing - original draft (lead)

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Chao Xu

Chao Xu

MOE Key Laboratory of Environmental Theoretical Chemistry, South China Normal University (SCNU), 55 West Zhongsan Rd., Guangzhou, 510006 China

These authors contributed equally to this work.

Contribution: Methodology (lead), Software (lead)

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Jiawei Lai

Jiawei Lai

School of Chemistry, Guangzhou Key Laboratory of Materials for Energy Conversion and Storage, South China Normal University (SCNU), 55 West Zhongsan Rd., Guangzhou, 510006 China

Contribution: Formal analysis (equal), ​Investigation (equal)

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Zhongliang Li

Zhongliang Li

School of Chemistry, Guangzhou Key Laboratory of Materials for Energy Conversion and Storage, South China Normal University (SCNU), 55 West Zhongsan Rd., Guangzhou, 510006 China

Contribution: ​Investigation (equal), Software (equal), Validation (equal)

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Yuping Zhang

Yuping Zhang

School of Chemistry, Guangzhou Key Laboratory of Materials for Energy Conversion and Storage, South China Normal University (SCNU), 55 West Zhongsan Rd., Guangzhou, 510006 China

Contribution: Data curation (lead), Formal analysis (equal), ​Investigation (supporting)

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Yan Liu

Yan Liu

School of Chemistry, Guangzhou Key Laboratory of Materials for Energy Conversion and Storage, South China Normal University (SCNU), 55 West Zhongsan Rd., Guangzhou, 510006 China

Contribution: ​Investigation (equal), Methodology (equal), Software (equal)

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Kui Ding

Corresponding Author

Kui Ding

School of Chemistry, Guangzhou Key Laboratory of Materials for Energy Conversion and Storage, South China Normal University (SCNU), 55 West Zhongsan Rd., Guangzhou, 510006 China

Contribution: Conceptualization (equal), Funding acquisition (supporting), Supervision (lead), Writing - review & editing (lead)

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Yue-Peng Cai

Corresponding Author

Yue-Peng Cai

School of Chemistry, Guangzhou Key Laboratory of Materials for Energy Conversion and Storage, South China Normal University (SCNU), 55 West Zhongsan Rd., Guangzhou, 510006 China

Contribution: Funding acquisition (lead), Supervision (equal), Writing - review & editing (equal)

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Rui Shang

Rui Shang

Department of Chemistry, The University of Tokyo, 7-3-1 Hongo, Tokyo, 113-8654 Japan

Contribution: Formal analysis (supporting), Writing - review & editing (supporting)

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Qifeng Zheng

Corresponding Author

Qifeng Zheng

School of Chemistry, Guangzhou Key Laboratory of Materials for Energy Conversion and Storage, South China Normal University (SCNU), 55 West Zhongsan Rd., Guangzhou, 510006 China

Contribution: Conceptualization (lead), Funding acquisition (lead), Supervision (lead), Writing - review & editing (lead)

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First published: 02 February 2023
Citations: 7

Abstract

Lithium metal batteries hold great promise for promoting energy density and operating at low temperatures, yet they still suffer from insufficient Li compatibility and slow kinetic, especially at ultra-low temperatures. Herein, we rationally design and synthesize a new amphiphilic solvent, 1,1,2,2-tetrafluoro-3-methoxypropane, for use in battery electrolytes. The lithiophilic segment is readily to solvate Li+ to induce self-assembly of the electrolyte solution to form a peculiar core-shell-solvation structure. Such unique solvation structure not only largely improves the ionic conductivity to allow fast Li+ transport and lower the desolvation energy to enable facile desolvation, but also leads to the formation of a highly robust and conductive inorganic SEI. The resulting electrolyte demonstrates high Li efficiency and superior cycling stability from room temperature to −40 °C at high current densities. Meanwhile, anode-free high-voltage cell retains 87 % capacity after 100 cycles.

Conflict of interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available in the Supporting Information of this article.

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