Abstract
A new gel polymer electrolyte (GPE) based supercapacitor with an ionic conductivity up to 0.32–0.94 mS cm−2 has been synthesized from a mixture of an ionic liquid (IL) with nanocellulose (NC). The new NC-ionogel was prepared by combining the IL 1-ethyl-3-methylimidazolium dimethyl phosphate (EMIMP) with carboxymethylated cellulose nanofibers (CNFc) at different ratios (CNFc ratio from 1 to 4). The addition of CNFc improved the ionogel properties to become easily printable onto the electrode surface. The new GPE based supercapacitor cell showed good electrochemical performance with specific capacitance of 160 F g−1 and an equivalent series resistance (ESR) of 10.2 Ω cm−2 at a current density of 1 mA cm−2. The accessibility to the full capacitance of the device is demonstrated after the addition of CNFc in EMIMP compared to the pristine EMIMP (99 F g−1 and 14.7 Ω cm−2).
Highlights
Publisher’s Note: MDPI stays neutralFrom all the different types of energy storage systems (ESS), the interest in supercapacitors (SCs) has grown thanks to their energy storage mechanism by electrical double layer, which increases cycle life and allows the use of safer ionic conductors and electrode materials than in traditional batteries [1]
X-ray diffraction (XRD) patterns for each ionic liquid (IL)/CNFc ratio, pristine CNFc and ethyl-3-methylimidazolium dimethyl phosphate (EMIMP) are shown in Figure 3a.6 of 14
◦ and 25◦ for all the Broadpresent signals are all cases, obtaining major intensities at 12 crystalline planeEMIMP/CNFc.mixtures, The major component of ionic liquid ensures good ionic which are related to the ionic liquid EMIMPa
Summary
From all the different types of energy storage systems (ESS), the interest in supercapacitors (SCs) has grown thanks to their energy storage mechanism by electrical double layer, which increases cycle life and allows the use of safer ionic conductors and electrode materials than in traditional batteries [1]. Their promising properties such as high-power density, fast charge–discharge rate and long-cycle stability, have turned SCs into a potentially useful tool for application in flexible and wearable electronics [2,3,4]. ILs, generally a room temperature molten salt, with regard to jurisdictional claims in published maps and institutional affiliations
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