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A Polymer-based Piezoelectric Vibration Energy Harvester with a 3D Meshed-Core Structure
Published on: February 20, 2019
Piezoelectric Polymer Solid Electrolyte Integrating Electromechanical Coupling and Ferroelectric Polarization
Junbao Kang1, Jiaxuan Zhao1, Peng Jiang1
1State Key Laboratory of Separation Membranes and Membrane Processes/National Center for International Joint Research on Separation Membranes, School of Textile Science and Engineering, Tiangong University, Tianjin, 300387, P. R. China.
This study introduces a novel piezoelectric polymer electrolyte that enhances lithium-ion conductivity and mechanical strength for stable solid-state lithium metal batteries. It effectively suppresses dendrite growth, enabling over 2000 cycles in batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Polymer Science
Background:
- Polymer solid electrolytes face challenges with low lithium-ion conductivity and mechanical weakness, limiting their use in solid-state lithium metal batteries (SSLMBs).
- Developing advanced electrolytes is crucial for improving the safety and performance of next-generation batteries.
Purpose of the Study:
- To design and synthesize a novel piezoelectric polymer solid electrolyte with enhanced lithium-ion conductivity and mechanical properties.
- To investigate the electromechanical coupling and ferroelectric polarization effects for stable cycling in SSLMBs.
- To elucidate the mechanism behind improved conductivity and dendrite suppression using piezoelectricity.
Main Methods:
- Fabrication of ferroelectric Bi4Ti3O12 nanoparticle (BIT NPs) loaded poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) piezoelectric nanofibers (B-P NFs) within a poly(ethylene oxide) (PEO) matrix.
- Characterization of the composite electrolyte's structure, polarization, and piezoelectric properties.
- Electrochemical testing of LiFePO4 batteries and density functional theory (DFT) calculations to understand the underlying mechanisms.
Main Results:
- The composite electrolyte exhibits unique polarization and piezoelectric effects due to the integrated B-P NFs.
- The 3D nanofiber network promotes lithium salt dissociation and utilizes mechanical stress-induced electric fields for dynamic regulation of lithium electroplating.
- Achieved stable cycling of LiFePO4 batteries for over 2000 cycles, demonstrating suppressed lithium dendrite growth and improved conductivity.
Conclusions:
- The developed piezoelectric polymer electrolyte effectively overcomes the limitations of traditional polymer electrolytes.
- The integration of piezoelectric and ferroelectric properties offers a promising strategy for high-performance and safe solid-state lithium metal batteries.
- The material shows significant potential for practical applications in flexible pouch batteries.
