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Updated: May 31, 2025
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
Published on: August 12, 2013
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Ion bridging enables high-voltage polyether electrolytes for quasi-solid-state batteries
Tianyi Hou1, Donghai Wang2, Bowen Jiang1
1State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, PR China.
Nature Communications
|January 22, 2025
Summary
Researchers developed a novel ion-bridging strategy to enhance polyether electrolytes for high-energy lithium-metal batteries. This approach improves oxidation stability, enabling safer and more efficient quasi-solid-state batteries with extended lifespans.
Area of Science:
- Materials Science
- Electrochemistry
- Polymer Science
Background:
- Polyether electrolytes are crucial for lithium-metal batteries due to their compatibility with lithium metal.
- However, their low oxidation thresholds limit the development of high-energy density batteries.
Purpose of the Study:
- To develop a general strategy for enhancing the oxidation stability of polyether electrolytes.
- To enable the design of high-voltage, high-performance, and safe quasi-solid-state lithium-metal batteries.
Main Methods:
- A general ion-bridging strategy was employed, connecting non-lithium metal ions with ethereal oxygen.
- A zinc ion-bridged polyether electrolyte (Zn-IBPE) was synthesized and characterized.
- The performance of Zn-IBPE was evaluated in various quasi-solid-state battery configurations, including high-voltage cells and large-capacity pouch cells.
- Safety was assessed using nail penetration tests.
Main Results:
- The ion-bridging strategy significantly improved the oxidation stability of polyether electrolytes, extending the electrochemical stability window to over 5 V.
- Zn-IBPE demonstrated good cyclability in 4.5 V Li||LiCoO2 batteries.
- Ampere-hour-level quasi-solid-state batteries (10 Ah and 18 Ah) exhibited elevated electrochemical performance and interfacial stability.
- Nail penetration tests confirmed the high safety of Zn-IBPE in 4 Ah pouch cells, showing no combustion or smoke.
Conclusions:
- The ion-bridging strategy provides a viable pathway for designing high-voltage polymer electrolytes.
- This approach offers a general solution for achieving high-performance and safe quasi-solid-state lithium-metal batteries.
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