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Improvement of power–energy characteristic of the lithium-ion capacitor by structure modification of the graphite anode

Published online by Cambridge University Press:  08 May 2017

Ilona Acznik ,
Katarzyna Lota  and
Agnieszka Sierczyńska
Ilona Acznik*
Affiliation:
Central Laboratory of Batteries and Cells, Institute of Non-Ferrous Metals Division in Poznan, Forteczna 12, 61-362 Poznan, Poland
Katarzyna Lota
Affiliation:
Central Laboratory of Batteries and Cells, Institute of Non-Ferrous Metals Division in Poznan, Forteczna 12, 61-362 Poznan, Poland
Agnieszka Sierczyńska
Affiliation:
Central Laboratory of Batteries and Cells, Institute of Non-Ferrous Metals Division in Poznan, Forteczna 12, 61-362 Poznan, Poland
*
Address all correspondence to Ilona Acznik at ilona.acznik@claio.poznan.pl
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Abstract

Lithium-ion capacitors utilizing graphite (G) and reduced graphite oxide (RGO) as negative electrode materials were investigated. Various reduction methods of graphite oxide were applied to compare properties of modified materials. The hybrid cells showed the energy density at mild current regimes of ca. 70–100 Wh/kg. However, at higher rates, only the capacitor with chemically RGO maintained this tendency. Moreover, the system demonstrated the energy density of 34 Wh/kg at a power density of 26 kW/kg. The electrochemical measurements were conducted in three-electrode systems to record responses of positive and negative electrodes separately.

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Type
Research Letters
Information
MRS Communications , Volume 7 , Issue 2 , June 2017 , pp. 245 - 252
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Copyright
Copyright © Materials Research Society 2017 

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