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Updated: Sep 23, 2025

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

Published on: August 12, 2013

Fluorinating the Solid Electrolyte Interphase by Rational Molecular Design for Practical Lithium-Metal Batteries.

Jin Xie¹, Shu-Yu Sun¹, Xiang Chen¹

¹Beijing Key Laboratory of Green Chemical, Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing, 100084, P. R. China.

Angewandte Chemie (International Ed. in English)

|May 16, 2022

Summary

Researchers developed a new fluorinated molecule for stable lithium-metal anodes. This activated fluoroalkyl molecule (AFA) creates a uniform solid electrolyte interphase (SEI), significantly extending battery life in practical lithium-sulfur cells.

Keywords:

Fluorinated Electrolytes Fluorinated Solid Electrolyte Interphase Lithium-Metal Batteries Molecular Design Pouch Cells

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Focused Ion Beam Fabrication of LiPON-based Solid-state Lithium-ion Nanobatteries for In Situ Testing

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Published on: March 7, 2018

Area of Science:

Materials Science
Electrochemistry
Energy Storage

Background:

Lithium (Li)-metal batteries face lifespan limitations due to Li-metal anode instability.
Fluorinated solid electrolyte interphase (SEI) formation is a key strategy to enhance Li-metal anode stability.
Rational molecular design is crucial for creating effective fluorinated SEI layers.

Purpose of the Study:

To propose design principles for fluorinated molecules for SEI construction.
To introduce an activated fluoroalkyl molecule (AFA) for uniform fluorinated SEI formation.
To evaluate the performance of AFA-derived SEI in practical Li-metal batteries, specifically Li-sulfur (Li-S) systems.

Main Methods:

Design of fluorinated molecules utilizing fluoroalkyl (-CF2CF2-) as an F reservoir.
Utilizing leaving groups on β-sites to drive C-F bond defluorination.
Synthesis and application of 2,2,3,3-tetrafluorobutane-1,4-diol dinitrate (AFA) for SEI formation on Li-metal anodes.

Main Results:

AFA enables fast and complete defluorination, forming a uniform fluorinated SEI on Li-metal anodes.
The AFA-constructed SEI in Li-S batteries achieved 183 cycles, outperforming LiNO3-based SEI by three times.
A Li-S pouch cell (360 Wh/kg) demonstrated 25 cycles using the AFA-modified anode.

Conclusions:

The study establishes rational molecular design principles for fluorinated molecules.
AFA is a highly effective molecule for constructing stable fluorinated SEI layers.
This approach significantly enhances the stability and cycle life of practical Li-metal batteries.