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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Triple-function eutectic solvent additive for high performance lithium metal batteries.

Wenqiang Fang1, Zuxin Wen1, Fenglin Wang1

  • 1School of Materials Science and Engineering, Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan Province, Central South University, Changsha 410083, China.

Science Bulletin
|February 29, 2024
PubMed
Summary
This summary is machine-generated.

A novel N-methylacetamide (NmAc) and LiNO3 additive enhances carbonate electrolytes for high-voltage lithium metal batteries (LMBs). This improves stability, reduces corrosion, and enables better performance in Li||NCM622 cells.

Keywords:
Eutectic solvent additiveInterfacial chemistryLithium metal batteryPF(5) capturerSolvation structure

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Storage

Background:

  • High-voltage lithium metal batteries (LMBs) require stable carbonate electrolytes.
  • Traditional electrolytes suffer from unstable interphases and corrosive by-products like hydrofluoric acid (HF).

Purpose of the Study:

  • To develop a triple-function eutectic solvent additive to enhance carbonate electrolyte stability and compatibility for LMBs.
  • To address the challenges of unstable electrode interphases and HF generation in traditional electrolytes.

Main Methods:

  • Incorporation of N-methylacetamide (NmAc) with LiNO3 as a eutectic solvent additive in carbonate electrolytes.
  • Investigation of Li+ solvation structure, Li plating morphology, and interactions with PF5.
  • Evaluation of cathode electrolyte interphase (CEI) properties and transition metal dissolution.
  • Electrochemical performance testing of Li||LiNi0.6Co0.2Mn0.2O2 (NCM622) cells.

Main Results:

  • NmAc significantly improved LiNO3 solubility, regulating Li+ solvation and promoting dense Li plating.
  • NmAc effectively complexed with PF5, mitigating HF generation and reducing electrolyte corrosivity.
  • The optimized CEI layer suppressed structural degradation and transition metal dissolution.
  • Li||NCM622 cells demonstrated superior cycle reversibility and rate capability with the modified electrolyte.

Conclusions:

  • Eutectic solvent additives, specifically NmAc with LiNO3, offer a promising strategy for stabilizing carbonate electrolytes in high-voltage LMBs.
  • This approach enhances electrolyte compatibility, reduces degradation, and improves battery performance.
  • The findings provide a rationale for advancing the practical application of high-voltage LMBs.