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Graphene-based lithium ion capacitor with high gravimetric energy and power densities
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2017 (English)In: Journal of Power Sources, ISSN 0378-7753, E-ISSN 1873-2755, Vol. 363, p. 422-427Article in journal (Refereed) Published
Abstract [en]

Hybrid capacitor configurations are now of increasing interest to overcome the current energy limitations of supercapacitors. In this work, we report a lithium ion capacitor (LIC) entirely based on graphene. On the one hand, the negative-battery-type- electrode consists of a self-standing, binder-free 3D macroporous foam formed by reduced graphene oxide and decorated with tin oxide nanoparticles (SnO2-rGO). On the other hand, the positive-capacitor-type- electrode is based on a thermally expanded and physically activated reduced graphene oxide (a-TEGO). For comparison purposes, a symmetric electrical double layer capacitor (EDLC) using the same activated graphene in 1.5 M Et4NBE4/ACN electrolyte is also assembled. Built in 1 M LiPF6 EC:DMC, the graphene-based LIC shows an outstanding, 10-fold increase in energy density with respect to its EDLC counterpart at low discharge rates (up to 200 Wh kg(-1)). Furthermore, it is still capable to deliver double the energy in the high power region, within a discharge time of few seconds.

Place, publisher, year, edition, pages
Elsevier, 2017. Vol. 363, p. 422-427
Keywords [en]
Tin oxide, Reduced graphene oxide, Activated graphene, Supercapacitor, Electric double layer pacitor, Lithium ion capacitor
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:umu:diva-140646DOI: 10.1016/j.jpowsour.2017.07.096ISI: 000411544300049OAI: oai:DiVA.org:umu-140646DiVA, id: diva2:1150047
Available from: 2017-10-17 Created: 2017-10-17 Last updated: 2018-06-09Bibliographically approved

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Talyzin, Alexandr V.
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