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Multifunctional Additive Enables a "5H" PEO Solid Electrolyte for High-Performance Lithium Metal Batteries
Zexiao Cheng1, Jingwei Xiang1, Lixia Yuan1
1State Key Laboratory of Material Processing and Die & Mold Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
ACS Applied Materials & Interfaces
|April 22, 2024
Summary
Researchers developed a novel "5H" poly(ethylene oxide) electrolyte with tris(pentafluorophenyl)borane additive for advanced solid-state lithium metal batteries, enhancing conductivity and safety.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Solid-state batteries with lithium metal anodes offer high energy density and safety advantages for next-generation energy storage.
- Current polymer electrolytes, particularly poly(ethylene oxide) (PEO), face limitations in ionic conductivity and lithium-ion transport for demanding applications.
- There is a critical need for improved electrolytes to unlock the full potential of solid-state lithium metal batteries.
Purpose of the Study:
- To develop a high-performance poly(ethylene oxide) (PEO) based electrolyte for solid-state lithium metal batteries.
- To enhance ionic conductivity, lithium-ion transference number, and electrochemical stability of PEO electrolytes.
- To improve the safety and cycling stability of lithium metal batteries through electrolyte modification.
Main Methods:
- Introduction of tris(pentafluorophenyl)borane (TPFPB) as a multifunctional additive into a poly(ethylene oxide) (PEO) electrolyte.
- Characterization of the modified electrolyte's ionic conductivity, crystallinity, and lithium-ion transference number.
- Electrochemical testing of Li/Li symmetric cells, LiFePO4/Li full cells, and NCM811/Li full cells with the developed electrolyte.
Main Results:
- The addition of TPFPB increased ionic conductivity from 6.08 × 10-5 to 1.54 × 10-4 S cm-1 and the lithium-ion transference number from 0.19 to 0.53.
- The modified electrolyte exhibited an enhanced electrochemical stability window over 4.6 V and improved interface stability.
- TPFPB imparted a self-extinguishing effect, enhancing battery safety, and enabled long-term cycling stability in various cell configurations.
Conclusions:
- The novel "5H" PEO electrolyte with TPFPB additive significantly enhances performance metrics for solid-state lithium metal batteries.
- TPFPB effectively reduces PEO crystallinity, promotes anion trapping, and optimizes interphase compositions for superior electrochemical properties.
- This work presents a promising strategy for developing advanced solid-state electrolytes for high-performance and safe lithium batteries.
