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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Ether-Oxygen Groups Modified Carboxylic Ester Enabling High-Voltage Lithium Metal Batteries.

Shuang Li1,2, Hongliang Xie1, Pushpendra Kumar3

  • 1State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China.

Angewandte Chemie (International Ed. in English)
|May 23, 2025
PubMed
Summary

Propylene glycol monomethyl ether acetate (PMA) is a new solvent for lithium metal batteries (LMBs). PMA-based electrolytes enable stable high-voltage cycling and retain capacity at elevated temperatures.

Keywords:
Contact ion pairsDe‐solvation behaviorsElectrolyte solvation structureLithium metal batteriesMolecular design

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Storage

Background:

  • Lithium metal batteries (LMBs) offer high energy density but face capacity degradation due to electrolyte decomposition at high voltages.
  • Developing stable electrolytes is crucial for advancing high-performance LMBs.

Purpose of the Study:

  • To introduce propylene glycol monomethyl ether acetate (PMA) as a novel solvent for LMB electrolytes.
  • To investigate the impact of PMA on electrolyte solvation structure and interfacial behavior.
  • To enhance the stability and performance of LMBs at high cut-off voltages.

Main Methods:

  • Formulation of PMA-based electrolytes with dual salts.
  • Electrochemical cycling of Li||LiNi0.8Co0.1Mn0.1O2 (NCM811) batteries at 4.5 V and 60 °C.
  • Molecular interfacial modeling to elucidate electrolyte-electrode interactions.

Main Results:

  • The PMA-based electrolyte demonstrated stable cycling performance for over 100 cycles at a high cut-off voltage of 4.5 V.
  • The battery retained 90.1% of its initial capacity at 60 °C.
  • The unique ether-oxygen functionality of PMA promotes contact ion pairs (CIPs), enhancing electrolyte stability.

Conclusions:

  • PMA is a promising solvent for developing high-performance LMB electrolytes.
  • The study provides insights into electrolyte design for stable high-voltage lithium metal batteries.
  • The findings contribute to advancing energy storage technologies.