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Updated: Dec 20, 2025

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

Published on: August 12, 2013

High-Efficiency Lithium Metal Anode Enabled by a Concentrated/Fluorinated Ester Electrolyte.

Shijian Chen¹, Yuxuan Xiang¹, Guorui Zheng¹

¹Collaborative Innovation Center of Chemistry for Energy Materials, State Key Laboratory for Physical Chemistry of Solid Surface, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.

ACS Applied Materials & Interfaces

|May 23, 2020

Summary

This study introduces a new fluorinated electrolyte for lithium metal anodes, achieving high Coulombic efficiency and stable cycling by forming a protective solid electrolyte interphase (SEI) layer that prevents detrimental side reactions.

Keywords:

concentrated electrolyte electrolyte optimization fluorinated solvent lithium metal anode solid electrolyte interphase

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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques

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Published on: November 11, 2013

Area of Science:

Electrochemistry
Materials Science
Energy Storage

Background:

Lithium metal anodes (LMA) offer high capacity but suffer from side reactions with conventional electrolytes.
Practical application of LMAs is hindered by electrolyte instability and dendrite formation.

Purpose of the Study:

To develop a novel fluorinated carbonate ester-based electrolyte for improved lithium metal anode performance.
To investigate the mechanism behind the enhanced stability and efficiency of the new electrolyte.

Main Methods:

Electrolyte formulation with diethyl fluorocarbonate (ETFEC) and 5 M LiFSI.
Electrochemical testing of Li||Cu and Li||LiFePO4 cells.
Characterization using SEM, operando OM, EIS, XPS, and SS-NMR.

Main Results:

Achieved ultrahigh Li plating/stripping Coulombic efficiency (CE) of 99.1% in Li||Cu cells.
Demonstrated stable cycling of Li||LiFePO4 batteries with limited Li metal and lean electrolyte.
Identified formation of a Li+-conductive SEI layer rich in LiF and sulfur species.

Conclusions:

The novel fluorinated electrolyte effectively suppresses side reactions and dead lithium formation.
The optimized electrolyte enables high performance and stability for lithium metal batteries.
The SEI layer's composition is crucial for the improved electrochemical behavior.