Enhancing supercapacitor energy density by mass-balancing of graphene composite electrodesCitation formats

  • External authors:
  • Edurne Redondo
  • Lewis Le Fevre
  • Richard Fields
  • Rebecca Todd

Standard

Enhancing supercapacitor energy density by mass-balancing of graphene composite electrodes. / Redondo, Edurne; Le Fevre, Lewis; Fields, Richard; Todd, Rebecca; Forsyth, Andrew; Dryfe, Robert.

In: Electrochim Acta, 14.08.2020.

Research output: Contribution to journalArticlepeer-review

Harvard

APA

Redondo, E., Le Fevre, L., Fields, R., Todd, R., Forsyth, A., & Dryfe, R. (Accepted/In press). Enhancing supercapacitor energy density by mass-balancing of graphene composite electrodes. Electrochim Acta.

Vancouver

Author

Redondo, Edurne ; Le Fevre, Lewis ; Fields, Richard ; Todd, Rebecca ; Forsyth, Andrew ; Dryfe, Robert. / Enhancing supercapacitor energy density by mass-balancing of graphene composite electrodes. In: Electrochim Acta. 2020.

Bibtex

@article{f04a16bf1bad4ed4ae173f85cce5fe78,
title = "Enhancing supercapacitor energy density by mass-balancing of graphene composite electrodes",
abstract = "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 (TEABF4) in acetonitrile as the electrolyte, placing these cells in between traditional and hybrid supercapacitors.",
keywords = "energy-based electrode optimisation, graphene additives, high voltage, mass balancing, quasi-reference electrode, supercapacitors",
author = "Edurne Redondo and {Le Fevre}, Lewis and Richard Fields and Rebecca Todd and Andrew Forsyth and Robert Dryfe",
year = "2020",
month = aug,
day = "14",
language = "English",
journal = "Electrochimica Acta",
issn = "0013-4686",
publisher = "Elsevier BV",

}

RIS

TY - JOUR

T1 - Enhancing supercapacitor energy density by mass-balancing of graphene composite electrodes

AU - Redondo, Edurne

AU - Le Fevre, Lewis

AU - Fields, Richard

AU - Todd, Rebecca

AU - Forsyth, Andrew

AU - Dryfe, Robert

PY - 2020/8/14

Y1 - 2020/8/14

N2 - 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 (TEABF4) in acetonitrile as the electrolyte, placing these cells in between traditional and hybrid supercapacitors.

AB - 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 (TEABF4) in acetonitrile as the electrolyte, placing these cells in between traditional and hybrid supercapacitors.

KW - energy-based electrode optimisation

KW - graphene additives

KW - high voltage

KW - mass balancing

KW - quasi-reference electrode

KW - supercapacitors

M3 - Article

JO - Electrochimica Acta

JF - Electrochimica Acta

SN - 0013-4686

ER -