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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
Published on: August 12, 2013
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Bioinspired gel polymer electrolyte for wide temperature lithium metal battery
Shuohan Liu1, Wensheng Tian2, Jieqing Shen1
1State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, China.
Nature Communications
|March 13, 2025
Summary
A novel bioinspired gel polymer electrolyte enables stable operation of high-energy lithium metal batteries across a wide temperature range (-30 to 80°C). This advancement addresses ion transport and interface stability issues for practical applications.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Stable operation of lithium metal batteries with gel polymer electrolytes is crucial for wide-temperature applications.
- Current limitations include insufficient ion transport dynamics and unstable electrolyte-electrode interfaces at extreme temperatures.
- These challenges hinder the practical implementation of high-energy-density lithium metal batteries.
Purpose of the Study:
- To develop a bioinspired gel polymer electrolyte for stable, wide-temperature operation of lithium metal batteries.
- To overcome the limitations of ion transport and interface stability at extreme temperatures (-30 to 80°C).
- To enable high-energy-density lithium metal batteries for practical applications.
Main Methods:
- Fabrication of a gel polymer electrolyte using a branched polymer with double-coupled asymmetric side chains.
- Investigation of the Li+ coordination environment and solvation structure.
- Electrochemical characterization, including ionic conductivity and transference number measurements.
- Performance testing of Li metal batteries with LiNi0.8Co0.1Mn0.1O2 cathodes at various temperatures.
Main Results:
- The developed gel polymer electrolyte exhibits a weak Li+ solvation structure, facilitating fast and uniform Li+ deposition.
- Achieved ionic conductivity of 1.03 × 10^-4 S cm^-1 at -40°C and a Li+ transference number of 0.83.
- Li metal batteries demonstrated initial specific discharge capacities of 121.4 mAh g^-1 at -30°C and 172.2 mAh g^-1 at 80°C.
- A pouch cell achieved a high specific energy of up to 490.8 Wh kg^-1.
Conclusions:
- The bioinspired gel polymer electrolyte enables stable and high-performance lithium metal batteries over a wide temperature range.
- The unique polymer structure effectively regulates ion transport and enhances interface stability.
- This work paves the way for practical, high-energy-density lithium metal batteries operating under diverse thermal conditions.
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