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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

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Published on: August 12, 2013

Fluorinated Solid Electrolyte Interphase Derived From Fluorinated Polymer Electrolyte To Stabilize Li Metal.

Jialong Fu¹, Zhuo Li¹, Xiaoyan Zhou¹

¹School of Materials Science and Engineering, State Key Laboratory of Material Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan, 430074, P. R. China.

|March 28, 2023

Summary

A novel fluorinated quasi-solid polymer electrolyte effectively stabilizes lithium metal anodes by forming a protective solid electrolyte interphase (SEI). This suppresses dendrite growth and pulverization, enhancing lithium metal battery performance and longevity.

Keywords:

Dendrites Energy storage Lithium metal battery Quasi-solid polymer electrolyte Solid electrolyte interphase

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Published on: March 7, 2018

Area of Science:

Materials Science
Electrochemistry
Polymer Science

Background:

Unstable interfaces between lithium metal anodes and liquid electrolytes cause dendrite formation and pulverization.
These issues hinder the practical application of high-energy-density lithium metal batteries.

Purpose of the Study:

To develop a stable solid electrolyte interphase (SEI) for lithium metal anodes.
To enhance the safety and cycle life of lithium metal batteries.

Main Methods:

Synthesis of a fluorinated quasi-solid polymer electrolyte.
Characterization of the SEI layer formed on the lithium metal anode.
Electrochemical testing of Li||Li symmetrical cells and Li||NCM batteries.

Main Results:

The fluorinated polymer electrolyte forms a C-F/LiF enriched SEI, stabilizing the lithium metal interface.
Homogenized Li plating/stripping and rapid Li+ transport were observed.
Li||Li symmetrical cells showed stable cycling for over 1400 hours.
Li||NCM batteries retained 87.77% capacity after 300 cycles.

Conclusions:

The fluorinated quasi-solid polymer electrolyte effectively suppresses lithium dendrites and pulverization.
This electrolyte enables long-term stable cycling and improved performance in lithium metal batteries.