Raw cellulose/polyvinyl alcohol blending separators prepared by phase inversion for high-performance supercapacitors.

Nanotechnology
Yingqi HengYimin A Wu

Abstract

The development of a biodegradable cellulose-based separator with excellent performance has been of great research significance and application potential for the green development of supercapacitors. Herein, the regenerated porous cellulose/Polyvinyl alcohol films (CP-10, CP-15, CP-20, CP-25) with different mass ratio were successfully fabricated by a simple blending and phase inversion process. Their electrochemical properties as separators in assembled supercapacitor were evaluated. Fourier transform infrared spectroscopy and x-ray diffraction analysis indicate that intermolecular and intramolecular hydrogen bonding existed between cellulose and polyvinyl alcohol of the CP films. Compared with other CP films, the CP-20 film shows higher mechanical strength (28.02 MPa), better wettability (79.06°), higher porosity (59.69%) and electrolyte uptake (281.26 wt%). These properties of CP-20 are expected to show better electrochemical performance as separator. Indeed, the electrochemical tests, including electrochemical impedance spectroscopy, cyclic voltammetry, galvanostatic charge discharge, demonstrate that the SC-20 capacitor (with CP-20 as separator) shows the lowest equivalent series resistance of 0.57 Ω, the highest areal cap...Continue Reading

References

Sep 14, 2010·Nano Letters·Chuizhou MengShoushan Fan
Jul 6, 2013·Materials Science & Engineering. C, Materials for Biological Applications·Ajit K SharmaNishith Verma
Apr 24, 2018·ACS Applied Materials & Interfaces·Kai JiangKangli Wang
Jul 17, 2020·ACS Applied Materials & Interfaces·Yiming ChenShaohua Jiang

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