Cryopolymerization enables anisotropic polyaniline hybrid hydrogels with superelasticity and highly deformation-tolerant electrochemical energy storage

Le Li, Yu Zhang, Hengyi Lu, Yufeng Wang, Jingsan Xu, Jixin Zhu, Chao Zhang () and Tianxi Liu ()
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Le Li: Donghua University
Yu Zhang: Georgia Institute of Technology and Emory University
Hengyi Lu: Donghua University
Yufeng Wang: Donghua University
Jingsan Xu: Queensland University of Technology
Jixin Zhu: Northwestern Polytechnical University (NPU)
Chao Zhang: Donghua University
Tianxi Liu: Donghua University

Nature Communications, 2020, vol. 11, issue 1, 1-12

Abstract: Abstract The development of energy storage devices that can endure large and complex deformations is central to emerging wearable electronics. Hydrogels made from conducting polymers give rise to a promising integration of high conductivity and versatility in processing. However, the emergence of conducting polymer hydrogels with a desirable network structure cannot be readily achieved using conventional polymerization methods. Here we present a cryopolymerization strategy for preparing an intrinsically stretchable, compressible and bendable anisotropic polyvinyl alcohol/polyaniline hydrogel with a complete recovery of 100% stretching strain, 50% compressing strain and fully bending. Due to its high mechanical strength, superelastic properties and bi-continuous phase structure, the as-obtained anisotropic polyvinyl alcohol/polyaniline hydrogel can work as a stretching/compressing/bending electrode, maintaining its stable output under complex deformations for an all-solid-state supercapacitor. In particular, it achieves an extremely high energy density of 27.5 W h kg−1, which is among that of state-of-the-art stretchable supercapacitors.

Date: 2020
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DOI: 10.1038/s41467-019-13959-9

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