Volume 63, Issue 13 e202314876
Research Article

Dual-Salt Electrolyte Additive Enables High Moisture Tolerance and Favorable Electric Double Layer for Lithium Metal Battery

Zuxin Wen

Zuxin Wen

School of Materials Science and Engineering, Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan Province, Central South University, Changsha, 410083 P. R. China

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

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Wenqiang Fang

Wenqiang Fang

School of Materials Science and Engineering, Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan Province, Central South University, Changsha, 410083 P. R. China

Contribution: Data curation (equal), Formal analysis (equal), Methodology (equal)

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Fenglin Wang

Fenglin Wang

School of Materials Science and Engineering, Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan Province, Central South University, Changsha, 410083 P. R. China

Contribution: Formal analysis (supporting), Validation (supporting)

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Hong Kang

Hong Kang

School of Materials Science and Engineering, Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan Province, Central South University, Changsha, 410083 P. R. China

Contribution: ​Investigation (supporting), Methodology (supporting)

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Shuoqing Zhao

Shuoqing Zhao

School of Materials Science & Engineering and BIC-ESAT, College of Engineering, Peking University, Beijing, 100871 P. R. China

Contribution: Resources (supporting), Validation (supporting)

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Prof. Shaojun Guo

Corresponding Author

Prof. Shaojun Guo

School of Materials Science & Engineering and BIC-ESAT, College of Engineering, Peking University, Beijing, 100871 P. R. China

Contribution: Project administration (lead), Supervision (equal), Writing - review & editing (lead)

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Prof. Gen Chen

Corresponding Author

Prof. Gen Chen

School of Materials Science and Engineering, Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan Province, Central South University, Changsha, 410083 P. R. China

Contribution: Conceptualization (lead), Funding acquisition (lead), Supervision (lead), Writing - original draft (equal)

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First published: 02 February 2024
Citations: 39

Graphical Abstract

A dual-salt additive-reinforced carbonate electrolyte (LTFAN) is proposed for stabilizing high-voltage LMBs. The in situ generated nitrogenous and fluoride-rich electrode electrolyte interphase with LTFAN vastly accelerates the interfacial reaction dynamics, and dual-salt additive notably strengthens the moisture tolerance. A thermodynamically favorable electric double layer at charged cathode interface is constructed.

Abstract

The carbonate electrolyte chemistry is a primary determinant for the development of high-voltage lithium metal batteries (LMBs). Unfortunately, their implementation is greatly plagued by sluggish electrode interfacial dynamics and insufficient electrolyte thermodynamic stability. Herein, lithium trifluoroacetate-lithium nitrate (LiTFA−LiNO3) dual-salt additive-reinforced carbonate electrolyte (LTFAN) is proposed for stabilizing high-voltage LMBs. We reveal that 1) the in situ generated inorganic-rich electrode-electrolyte interphase (EEI) enables rapid interfacial dynamics, 2) TFA preferentially interacts with moisture over PF6 to strengthen the moisture tolerance of designed electrolyte, and 3) NO3 is found to be noticeably enriched at the cathode interface on charging, thus constructing Li+-enriched, solvent-coordinated, thermodynamically favorable electric double layer (EDL). The superior moisture tolerance of LTFAN and the thermodynamically stable EDL constructed at cathode interface play a decisive role in upgrading the compatibility of carbonate electrolyte with high-voltage cathode. The LMBs with LTFAN realize 4.3 V-NCM523/4.4 V-NCM622 superior cycling reversibility and excellent rate capability, which is the leading level of documented records for carbonate electrode.

Conflict of interests

The author 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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