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Enhancing the Interfacial Stability of Thin Solid Polymer Electrolyte with Fluorinated Covalent Organic Framework
Tao Liu1, Yuan Zhong1, Xiangyu Gao1
1School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu 210094, China.
Nano Letters
|January 31, 2025
Summary
Researchers developed a thin polymer electrolyte using fluorinated covalent organic framework nanosheets to improve stability and performance in solid-state lithium metal batteries. This enhances ionic conductivity and mitigates dendrite growth for safer, higher-energy batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Polymer Science
Background:
- Thin polymer electrolytes, like poly(ethylene oxide) (PEO)-based ones, are crucial for high-energy-density batteries.
- Challenges include low ionic conductivity, lithium dendrite formation, and interfacial side reactions, hindering practical application.
Purpose of the Study:
- To enhance the interfacial stability of thin PEO-based electrolytes.
- To improve ionic conductivity and suppress lithium dendrite growth.
- To enable high-performance solid-state lithium metal batteries.
Main Methods:
- Surface modification of PEO-based electrolytes with fluorinated covalent organic framework nanosheets (CONs).
- Fabrication of a 14 μm thin electrolyte.
- Electrochemical characterization (e.g., Li symmetric cells, full cells with LiFePO4).
- Density Functional Theory (DFT) calculations.
Main Results:
- The CON layer effectively enriched and averaged free Li+ ions, mitigating interfacial side reactions.
- Significantly improved electrode/electrolyte interfacial stability was observed.
- Li symmetric cells demonstrated stability for over 1000 hours.
- A LiFePO4∥Li full cell retained 97.3% capacity at 0.5 C after 150 cycles at 60 °C.
Conclusions:
- The surface modification strategy using CONs is effective in enhancing thin polymer electrolyte performance.
- This approach offers a valuable reference for developing advanced solid-state lithium metal batteries.
- The stabilized interface promotes higher energy density and improved battery longevity.
