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Enhancing the ionic conductivity and mechanical properties of PEO-based solid electrolytes through thermal
Lifa Zhang1,2, Liang Fu1,2, Weisi Qin1,2
1Shanghai Institute of Applied Mathematics and Mechanics, School of Mechanics and Engineering Science, Shanghai University, Shanghai 200072, China. huhongjiu@shu.edu.cn.
Physical Chemistry Chemical Physics : PCCP
|July 3, 2023
Summary
Pre-stretching polymer electrolytes significantly enhances ionic conductivity and mechanical strength for flexible batteries. This method improves battery performance by optimizing polymer structure and incorporating nanoceramics.
Area of Science:
- Materials Science
- Electrochemistry
- Polymer Science
Background:
- Solid polymer electrolytes face limitations in flexible batteries at ambient temperatures.
- Pre-stretching offers a method to direct polymer crystallization and overcome these limitations.
Purpose of the Study:
- Investigate the impact of pre-stretching on polyethylene oxide (PEO)-based polymer electrolytes.
- Analyze changes in ionic conductivity, mechanical behavior, and microstructural/thermal properties.
Main Methods:
- Subjecting PEO-based polymer electrolytes to varying levels of thermal pre-strain.
- Characterizing ionic conductivity, mechanical properties (strength, stiffness, modulus, hardness), and microstructural/thermal characteristics.
Main Results:
- Thermal stretching significantly increased through-plane ionic conductivity and in-plane strength/stiffness.
- Modulus and hardness decreased in the thickness direction for pre-stretched films.
- 50-80% pre-strain boosted ionic conductivity by 1.6x and in-plane properties by 120-140%.
- Nanoceramic addition further enhanced performance in pre-stretched PEO.
Conclusions:
- Pre-stretching PEO-based electrolytes is a viable strategy to enhance flexible battery performance.
- Optimized pre-strain levels (50-80%) improve ionic conductivity and mechanical integrity.
- Nanoceramic fillers synergize with pre-stretching to further boost electrolyte properties by reducing crystallinity and increasing free volume.
