Multi‐Foldable and Environmentally Stable All‐Solid‐State Supercapacitor Based on Hierarchical Nano‐Canyon Structured Ionic‐Gel Polymer Electrolyte. (9th December 2021)

• Record Type: Journal Article
• Authors: Lee, Dawoon; Song, Yeonhwa; Song, Yongjun; Oh, Seung Ja; Choi, U Hyeok; Kim, Jaekyun
• Is Part Of: Advanced functional materials. Volume 32:Number 13(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-12-09
• Subjects: flexibility -- ionic‐gel polymer electrolytes -- nano‐canyon structures -- solvating ionic liquids -- supercapacitors; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.202109907
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract: New ionic‐gel polymer electrolytes (IGPEs) are designed for use as electrolytes for all‐solid‐state supercapacitors (ASSSs) with excellent deformability and stability. The combination of the photochemical reaction‐based polymer matrix, weak‐binding lithium salt with ionic liquid, and ion dissociating solvator is employed to construct the nano‐canyon structured IGPE with high ionic conductivity (σDC = 1.2 mS cm −1 at 25 ° C), high dielectric constant (εs = 131), and even high mechanical robustness (bending deformation for 10 000 cycles with superior conductivity retention [≈ 91%]). This gives rise to ASSS with high compatibility and stability, which is compliant with foldable electronics. Consequently, this ASSS delivers remarkable electrochemical performance (specific capacitance of ≈ 105 F g −1 at 0.22 A g −1, maximum energy density and power density of 23 and 17.2 kW kg −1 ), long lifetime (≈ 93% retention after 30 days), wider operating temperature (≈ 0–120 ° C), and mechanical stabilities with no significant capacitance reduction after mechanical bending and multiple folding, confirming the superior electrochemical durability under serious deformation states. Therefore, this ultra‐flexible and environmentally stable ASSS based on the IGPE having the nano‐canyon morphology can be a novel approach for powering up the ultra‐deformable and durable next‐generation wearable energy storage devices. Abstract : Hierarchical nano‐canyon structured ionic‐gel polymer electrolytes are prepared using PEGDA matrix, LiTFSI salt, EMIMTFSI ionic liquid, and TEGDME solvator by the UV curing process. The unique morphology provides IGPE with high flexibility and ionic conductivity. Moreover, the IGPE‐based all‐solid‐state supercapacitor shows excellent electrochemical performance, stabilities, and deformation abilities while retaining initial performance even under severe deformation states such as the 4‐folded state.