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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Different-grain-sized boehmite nanoparticles for stable all-solid-state lithium metal batteries
Weiran Zhao1, Peng Tian1, Tingting Gao1
1School of Chemical Engineering, Dalian University of Technology, Dalian 116024, Liaoning, PR China. tianpeng@dlut.edu.cn.
Nanoscale
|May 17, 2024
Summary
Adding boehmite nanoparticles to polyethylene oxide (PEO) solid polymer electrolytes (SPEs) improves performance in lithium metal batteries. Larger boehmite grain sizes enhance ionic conductivity and electrochemical stability for safer, long-lasting batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Polymer Science
Background:
- Polyethylene oxide (PEO) is a common polymer electrolyte, but its crystalline nature and low oxidation resistance limit its use in solid-state lithium metal batteries.
- High interface impedance and limited electrochemical stability (<4.0 V) hinder PEO-based electrolytes in demanding battery applications.
Purpose of the Study:
- To design a novel PEO-based solid polymer electrolyte (SPE) incorporating boehmite nanoparticles to overcome the limitations of conventional PEO electrolytes.
- To investigate the effect of boehmite nanoparticle grain size on the performance of boehmite/PEO polymer electrolytes (BPEs) in all-solid-state lithium metal batteries.
Main Methods:
- Synthesized boehmite nanoparticles with varying grain sizes by controlling hydrothermal temperature.
- Fabricated boehmite/PEO polymer electrolytes (BPEs) using boehmite nanoparticles of different sizes.
- Evaluated the electrochemical performance of BPEs in all-solid-state lithium metal batteries, including ionic conductivity, electrochemical window, and cycling stability.
Main Results:
- Increasing boehmite grain size led to improved performance in the BPEs.
- The optimal BPE demonstrated a high Li+ transference number (0.59), ionic conductivity (1.25 × 10-4 S m-1), and an electrochemical window of ~4.5 V at 60 °C.
- A lithium symmetric battery using the best BPE achieved stable lithium plating/stripping for 500 hours, and a LiFePO4/BPE/Li battery showed excellent cycling stability with 86% capacity retention after 100 cycles.
Conclusions:
- The incorporation of boehmite nanoparticles, particularly those with optimized grain sizes, significantly enhances the performance of PEO-based solid polymer electrolytes.
- The developed BPEs offer a promising strategy for achieving high ionic conductivity and robust interface stability, crucial for advanced all-solid-state lithium metal batteries.
- This design approach demonstrates considerable potential for developing safer and more efficient solid-state battery technologies.
