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Self-healable gels in electrochemical energy storage devices

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Abstract

In the green energy and carbon-neutral technology, electrochemical energy storage devices have received continuously increasing attention recently. However, due to the unavoidable volume expansion/shrinkage of key materials or irreversible mechanical damages during application, the stability of energy storage and delivery as well as the lifetime of these devices are severely shortened, leading to serious performance degradation or even safety issues. Therefore, the utilization of self-healable gels into electrochemical energy storage devices, such as electrodes, binders, and electrolytes, is proven as an effective method to realize long-term stable operation of these devices via the self-repairing of mechanical and electrochemical characteristics. Herein, this review first summarizes the feature and fabrication of different gels, paying special attention to hydrogels, organohydrogels, and ionogels. Then, basic concepts and figure of merit of self-healable gels are analyzed with a detailed discussion at the healing mechanisms, from reversible dynamic bonds to physical molecular diffusion, and to external healing trigger. Then we introduce all the important parts of electrochemical energy storage devices, which could be replaced by healable gels to enhance the durability, including electrodes, binders, and electrolytes. Finally, the critical challenges and future perspectives regarding the future development of healable gels based high-performance electrochemical energy storage devices or electronics are provided.

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Acknowledgements

This work was financially supported by the Natural Science Research Start-up Foundation of Recruiting Talents of Nanjing University of Posts and Telecommunications (No. NY221111) and Natural Science Foundation of the Higher Education Institutions of Jiangsu Province (No. 22KJB430038) awarded to Y. L. Z. W. L. thanks the support from the National Natural Science Foundation Program of China (No. 52204370) and Open project of Hebei Key Laboratory of Hazardous Chemicals Safety and Control Technology (No. 20211204-7).

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  1. Yang Li and PeiPei Ding contributed equally to this work.

Authors and Affiliations

  1. College of Electronic and Optical Engineering & College of Flexible Electronics (Future Technology), Nanjing University of Posts & Telecommunications (NJUPT), Nanjing, 210023, China

    Yang Li, Yuzhe Gu, Lele Wang, Jiayang Feng & Baoguang Liu

  2. State Key Laboratory of Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors, Institute of Advanced Materials (IAM), Nanjing University of Posts and Telecommunications (NJUPT), Nanjing, 210023, China

    Yang Li, Sheng Qian & Yuncong Pang

  3. College of Materials Science & Engineering, Beijing University of Technology, Beijing, 100124, China

    PeiPei Ding

  4. Beijing Advanced Innovation Center for Materials Genome Engineering, Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China

    Qi Wan & Ping Li

  5. Pillar of Engineering Product Development, Singapore University of Technology and Design, Singapore, 487372, Singapore

    Zhiwei Liu

  6. School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Zhiwei Liu

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  1. Yang Li
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Correspondence to Yang Li or Zhiwei Liu.

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Li, Y., Ding, P., Gu, Y. et al. Self-healable gels in electrochemical energy storage devices. Nano Res. 17, 3302–3323 (2024). https://doi.org/10.1007/s12274-023-6063-6

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