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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Electrolyte Engineering for 5 V Lithium Metal Batteries.

Mengmin Jia1, Canhui Wu1, Mengjia Hu1

  • 1Collaborative Innovation Center of Henan Province For Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Henan Province Engineering Research Center of Special Electrolytes for Secondary Batteries in Low-Altitude Aircraft,School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)
|July 10, 2026
PubMed
Summary

A novel electrolyte additive, N-methyltrifluoroacetamide (NMTFA), enhances stability in high-voltage lithium-rich manganese-based oxide (LRMO) batteries. This improves cycling performance and mitigates electrolyte decomposition for advanced energy storage.

Keywords:
electrolyte additiveelectrolyte solvation structurehigh‐voltage lithium metal batterieslithium metal anodelithium‐rich manganese‐based oxide cathode

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Storage

Background:

  • Lithium-metal batteries (LMBs) with lithium-rich manganese-based oxide (LRMO) cathodes promise high energy density (>750 Wh kg⁻¹).
  • Practical application is limited by electrolyte decomposition and capacity fade at high voltages.

Purpose of the Study:

  • To introduce N-methyltrifluoroacetamide (NMTFA) as a novel electrolyte additive for high-voltage LRMO LMBs.
  • To improve interfacial stability and mitigate electrolyte degradation.

Main Methods:

  • NMTFA was investigated as an additive with lithium difluoro(oxalato)borate (LiDFOB).
  • The additive's role in modulating solvation structure and scavenging radicals was analyzed.
  • Electrochemical performance of Li||LRMO full cells was evaluated.

Main Results:

  • NMTFA scavenges oxygen radicals, reducing electrolyte degradation and gas evolution.
  • NMTFA and DFOB⁻ anions promote a nitrogen-/boron-rich interphase, weakening Li⁺-solvent interactions.
  • Full cells demonstrated excellent cycling stability: >70% capacity retention after 800 cycles at 4.8 V and >80% after 300 cycles at 5.0 V.

Conclusions:

  • NMTFA effectively enhances electrolyte stability and interfacial properties in high-voltage LRMO batteries.
  • The findings offer insights for designing advanced electrolytes for high-performance lithium-metal batteries.