Enhancing supercapacitor energy density by mass-balancing of graphene composite electrodes

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26620%2F20%3APU139291" target="_blank" >RIV/00216305:26620/20:PU139291 - isvavai.cz</a>
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S0013468620313505?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0013468620313505?via%3Dihub</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.electacta.2020.136957" target="_blank" >10.1016/j.electacta.2020.136957</a>

Result language
angličtina
Original language name
Enhancing supercapacitor energy density by mass-balancing of graphene composite electrodes
Original language description
We present a new strategy to optimise the energy density of supercapacitor cells, by systematically varying the amount of graphene-related additive, while mass balancing the positive and negative electrodes. The capacitance and the electrochemically stable potential window of the electrodes have been determined for several electrodes with different additive loadings by using a recently reported electrode optimisation technique. These key factors for calculating the mass balance were obtained based on the constant current charge/discharge cycling with a coin-cell-incorporated quasi-reference electrode. Then, multi-pairing of electrodes is proposed based on the maximum theoretical energy density, and optimised supercapacitor cells have been assembled. Using this strategy, these cells are shown to reach a voltage of 3.2 V within stability conditions, providing an energy density of 37.9 W h kg(-1) (double the value for a symmetric non-graphene cell) and a power density of 149 kW kg(-1) at 2 A g(-1), using 1 M tetraethylammonium tetrafluoroborate (TEABF(4)) in acetonitrile as the electrolyte, placing these cells in between traditional and hybrid supercapacitors. (C) 2020 The Authors. Published by Elsevier Ltd.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10405 - Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)

Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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