Highly Flexible and Stable Solid-State Supercapacitors Based on a Homogeneous Thin Ion Gel Polymer Electrolyte Using
Dawoon Lee1, Yeon Hwa Song2, U Hyeok Choi2
1Department of Photonics and Nanoelectronics , Hanyang University , Ansan 15588 , Republic of Korea.
ACS Applied Materials & Interfaces
|October 16, 2019
Summary
Researchers developed a new ion gel polymer electrolyte (IGPE) thin film using a stamping method for advanced all-solid-state energy storage. This flexible IGPE demonstrates high performance and stability in wearable devices.
Area of Science:
- Materials Science
- Electrochemistry
- Polymer Science
Background:
- Designing ion gel polymer electrolytes (IGPEs) is crucial for next-generation all-solid-state energy storage systems, requiring both structural integrity and efficient ion transport.
- Current IGPEs face challenges in balancing mechanical support with ionic conductivity for practical applications.
Purpose of the Study:
- To develop a novel IGPE thin film with enhanced structural and electrochemical properties for all-solid-state energy storage.
- To investigate the potential of a silicon elastomer-based stamping method for fabricating homogeneous IGPEs with low surface roughness.
Main Methods:
- Fabrication of an IGPE thin film by intertwining an ion-diffusing phase (ionic liquids and lithium salts) with a cross-linked epoxy phase using a poly(dimethylsiloxane) (PDMS) stamping method.
- Optimization of IGPE film parameters including ionic constituent concentrations, film thickness, and process conditions.
- Characterization of the IGPE's ionic conductivity, capacitance, and electrochemical performance in an all-solid-state supercapacitor configuration.
Main Results:
- The developed IGPE thin film exhibited a homogeneous structure with low surface roughness (0.5 nm) and high ionic conductivity (0.23 mS/cm).
- An all-solid-state supercapacitor utilizing the IGPE demonstrated high energy and power densities (44 Wh/kg at 875 W/kg) and a significant reduction in current-resistance drop (>50%).
- The supercapacitor maintained its electrochemical performance after severe mechanical deformation (bending, rolling), indicating excellent stability and flexibility.
Conclusions:
- The PDMS stamping method is effective for producing high-performance IGPE thin films suitable for all-solid-state wearable energy storage.
- The developed IGPEs offer a promising solution for creating flexible, stable, and efficient energy storage devices.
- This work advances the development of materials for next-generation wearable electronics and energy storage systems.
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