Volume 21, Issue 3 2407855
Research Article

An Amphiphilic Molecule Induced Anion-Enrichment Interface for Next-Generation Lithium Metal Batteries

Sheng Liu

Sheng Liu

College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, 1# Dongsanlu, Erxianqiao, Chengdu, Sichuan, 610059 P. R. China

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Yu Yan

Yu Yan

College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, 1# Dongsanlu, Erxianqiao, Chengdu, Sichuan, 610059 P. R. China

Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, Sichuan, 611731 P. R. China

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Ruixin Zheng

Ruixin Zheng

College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, 1# Dongsanlu, Erxianqiao, Chengdu, Sichuan, 610059 P. R. China

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Guilei Tian

Guilei Tian

College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, 1# Dongsanlu, Erxianqiao, Chengdu, Sichuan, 610059 P. R. China

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Xinxiang Wang

Xinxiang Wang

College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, 1# Dongsanlu, Erxianqiao, Chengdu, Sichuan, 610059 P. R. China

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Chaozhu Shu

Corresponding Author

Chaozhu Shu

College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, 1# Dongsanlu, Erxianqiao, Chengdu, Sichuan, 610059 P. R. China

State Key Laboratory of Geo-Hazard Prevention and Geo-Environment Protection, Chengdu University of Technology, Chengdu, Sichuan, 610059 P. R. China

E-mail: [email protected]

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First published: 22 November 2024
Citations: 1

Abstract

The electrolyte engineering enables the fabrication of robust electrode/electrolyte interphase with excellent electrochemical stability for reliable lithium (Li) metal batteries (LMBs). Herein, an amphiphilic molecule nonafluoro-1-butanesulfonate (NFSA) is employed in electrolytes to realize anion-enrichment interfacial design. The functions of such an amphiphilic molecule in the electrolyte and anode/electrolyte interphases of LMBs are elucidated via theoretical and experimental analyses. The polar lithophilic segments (-SO3-) present a capability to solvate Li+, while the perfluoroalkyl chains (-CF2CF2CF2CF3) exhibit a solvent-phobic, which alters the Li+ solvation environment in the electrolyte and thus building a favorable interphase enriched with anion-derived inorganic compositions on Li electrode. As a result, the designed electrolyte enables stable operation of the Li||Cu cells for more than 200 cycles with a cumulative irreversible capacity loss of only 2.4 mAh cm−2, and the long-term cycle life of the Li||Li cells is extended to more than 1500 h with a small overpotential (36.5 mV). Moreover, prolonged cycle life of the full cell assembled with commercial LiFePO4 cathode (over 80% capacity retention after 500 cycles at 0.5 C) is achieved even under the limiting Li source (≈5 mAh cm−2), high cathode loading (≈12 mg cm−2), and lean electrolyte (≈2.5 µL mg−1).

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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