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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10405 - Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

ELECTROCHIMICA ACTA

ISSN

0013-4686

e-ISSN

1873-3859

Svazek periodika

360

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

10

Strana od-do

„136957-1“-„136957-10“

Kód UT WoS článku

000576817900006

EID výsledku v databázi Scopus

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