Flexible Supercapacitors with Novel Gel Electrolytes

Flexible Supercapacitors with Novel Gel Electrolytes

Bibliographic Details
Main Author: YANG, YONGRUI
Language:English
Published: University of Akron / OhioLINK 2020
Subjects:
Materials Science
Online Access:http://rave.ohiolink.edu/etdc/view?acc_num=akron1590682495188219
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spelling ndltd-OhioLink-oai-etd.ohiolink.edu-akron15906824951882192021-08-03T07:15:11Z Flexible Supercapacitors with Novel Gel Electrolytes YANG, YONGRUI Materials Science In this thesis, we study flexible supercapacitors. Recent progress in flexible supercapacitors is reviewed in chapter I. Ionic liquid gel electrolytes used for approaching high-energy density supercapacitors are investigated in chapter II. In chapter III, we study the double-network hydrogel with redox additives as the solid-state electrolytes for flexible supercapacitorsIn Chapter I, after a brief introduction to the current situation of flexible supercapacitors and the mechanisms of different supercapacitors, we summarize the recent progress in both electrode materials and electrolyte materials for flexible supercapacitors, which includes carbon materials, conducting polymers, transition metal oxides/chalcogenides/nitrides, MXenes, metal-organic frameworks (MOFs), and covalent-organic frameworks (COFs) for electrode materials and the polymer-based gel electrolytes with different supporting electrolytes. In the end, we give a brief discussion on current challenges and an outlook for the future directions.In Chapter II, a novel 1-butyl-3-methylimidazolium tetrafluoroborate (BMIMBF4) : poly(vinyl alcohol) (PVA) : tetrabutylammonium tetrafluoroborate (TBABF4) (BMIMBF4:PVA:TBABF4) is developed for enhancing the energy density of supercapacitors. It is found that the BMIMBF4:PVA:TBABF4 gel electrolytes exhibit an ionic conductivity of 21.7 mS/cm, which is much higher than that of BMIMBF4:PVA gel electrolyte. The quasi-solid-state asymmetric supercapacitors assembled by using the BMIMBF4:PVA:TBABF4 gel as electrolyte, and MnO2 coated carbon cloth as the positive electrode and reduced graphene oxide coated on carbon cloth as the negative electrode, respectively, exhibit a wide operational window of 3V, an energy density of 61.2 Wh/kg at the power density of 1049 W/kg, an operational temperature ranging from 20 oC to 90 oC, and more than 80% capacitance retention after 3000 charge/discharge cycles. In Chapter III, we developed pHEAA-gelatin-chitosan Na2MoO4 DN hydrogel electrolytes for approaching high energy density and flexibility of supercapacitors. The pHEAA-gelatin-chitosan Na2MoO4 DN hydrogel electrolytes exhibit superior mechanical strength, good flexibility, and fast self-recovery performances. The symmetric supercapacitors (SSCs) constructed by using pHEAA-gelatin-chitosan Na2MoO4 DN hydrogel as the quasi-solid-state electrolytes and carbon cloth as electrodes show an energy density of 0.07 mWh/cm3 (~34 Wh/kg) at the power density of 3.8 mW/cm3 (~1800 W/kg), and more than 95% capacitance retention after 3000 charge/discharge cycles. 2020-07-15 English text University of Akron / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=akron1590682495188219 http://rave.ohiolink.edu/etdc/view?acc_num=akron1590682495188219 unrestricted This thesis or dissertation is protected by copyright: some rights reserved. It is licensed for use under a Creative Commons license. Specific terms and permissions are available from this document's record in the OhioLINK ETD Center.
collection NDLTD
language English
sources NDLTD
topic Materials Science
spellingShingle Materials Science
YANG, YONGRUI
Flexible Supercapacitors with Novel Gel Electrolytes
author YANG, YONGRUI
author_facet YANG, YONGRUI
author_sort YANG, YONGRUI
title Flexible Supercapacitors with Novel Gel Electrolytes
title_short Flexible Supercapacitors with Novel Gel Electrolytes
title_full Flexible Supercapacitors with Novel Gel Electrolytes
title_fullStr Flexible Supercapacitors with Novel Gel Electrolytes
title_full_unstemmed Flexible Supercapacitors with Novel Gel Electrolytes
title_sort flexible supercapacitors with novel gel electrolytes
publisher University of Akron / OhioLINK
publishDate 2020
url http://rave.ohiolink.edu/etdc/view?acc_num=akron1590682495188219
work_keys_str_mv AT yangyongrui flexiblesupercapacitorswithnovelgelelectrolytes
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