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Nat Commun. 2015 Dec 22;6:10310. doi: 10.1038/ncomms10310.

A self-healable and highly stretchable supercapacitor based on a dual crosslinked polyelectrolyte.

Author information

1
Department of Physics and Materials Science, City University of Hong Kong, Hong Kong 999077, China.
2
Laboratory of Advanced Materials (MOE), Department of Chemical Engineering, Tsinghua University, Beijing 100084, China.
3
Shenzhen Research Institute, City University of Hong Kong, Shenzhen 518000, China.

Abstract

Superior self-healability and stretchability are critical elements for the practical wide-scale adoption of personalized electronics such as portable and wearable energy storage devices. However, the low healing efficiency of self-healable supercapacitors and the small strain of stretchable supercapacitors are fundamentally limited by conventional polyvinyl alcohol-based acidic electrolytes, which are intrinsically neither self-healable nor highly stretchable. Here we report an electrolyte comprising polyacrylic acid dual crosslinked by hydrogen bonding and vinyl hybrid silica nanoparticles, which displays all superior functions and provides a solution to the intrinsic self-healability and high stretchability problems of a supercapacitor. Supercapacitors with this electrolyte are non-autonomic self-healable, retaining the capacitance completely even after 20 cycles of breaking/healing. These supercapacitors are stretched up to 600% strain with enhanced performance using a designed facile electrode fabrication procedure.

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