Organic Radical-Boosted Ionic Conductivity in Redox Polymer Electrolyte for Advanced Fiber-Shaped Energy Storage Devices  

作　　者：Jeong-Gil Kim Jaehyoung Ko Hyung-Kyu Lim Yerin Jo Hayoung Yu Min Woo Kim Min Ji Kim Hyeon Su Jeong Jinwoo Lee Yongho Joo Nam Dong Kim 

机构地区：[1]Institute of Advanced Composite Materials,Korea Institute of Science and Technology,92 Chudong-ro,Bongdong-eup,Wanju-gun,Jeollabuk-do 55324,Republic of Korea [2]Department of Chemical and Biomolecular Engineering,Korea Advanced Institute of Science and Technology,291 Daehak-ro,Yuseong-gu,Daejeon 34141,Republic of Korea [3]Division of Chemical and Bioengineering,Kangwon National University,Chuncheon 24341,Republic of Korea [4]Department of Materials Science and Engineering,Gwangju Institute of Science and Technology,Gwangju 61005,Republic of Korea

出　　处：《Nano-Micro Letters》2025年第8期202-218,共17页纳微快报(英文版)

基　　金：supported by Korea Institute of Science and Technology(KIST)Institutional Program and Open Research Program(ORP);This work was also supported by grant from the National Research Foundation(NRF)of Korea government(RS-2024-00433159 and RS-2023-00208313);from ITECH R&D program of MOTIE/KEIT(RS-2023-00257573).

摘　　要：Fiber-shaped energy storage devices(FSESDs)with exceptional flexibility for wearable power sources should be applied with solid electrolytes over liquid electrolytes due to short circuits and leakage issue during deformation.Among the solid options,polymer electrolytes are particularly preferred due to their robustness and flexibility,although their low ionic conductivity remains a significant challenge.Here,we present a redox polymer electrolyte(HT_RPE)with 4-hydroxy-2,2,6,6-tetramethylpiperidine-1-oxyl(HT)as a multi-functional additive.HT acts as a plasticizer that transforms the glassy state into the rubbery state for improved chain mobility and provides distinctive ion conduction pathway by the self-exchange reaction between radical and oxidized species.These synergetic effects lead to high ionic conductivity(73.5 mS cm−1)based on a lower activation energy of 0.13 eV than other redox additives.Moreover,HT_RPE with a pseudocapacitive characteristic by HT enables an outstanding electrochemical performance of the symmetric FSESDs using carbon-based fiber electrodes(energy density of 25.4 W h kg^(−1) at a power density of 25,000 W kg^(−1))without typical active materials,along with excellent stability(capacitance retention of 91.2%after 8,000 bending cycles).This work highlights a versatile HT_RPE that utilizes the unique functionality of HT for both the high ionic conductivity and improved energy storage capability,providing a promising pathway for next-generation flexible energy storage devices.

关 键 词：Redox polymer electrolyte Hydroxy-TEMPO Ionic conductivity Self-exchange reaction Fiber-shaped energy storage devices 

分 类 号：O646[理学—物理化学]