期刊
JOURNAL OF POWER SOURCES
卷 363, 期 -, 页码 422-427出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2017.07.096
关键词
Tin oxide; Reduced graphene oxide; Activated graphene; Supercapacitor; Electric double layer capacitor; Lithium ion capacitor
资金
- European Union's Horizon 2020 research and innovation programme [696656]
- Spanish Ministry of Economy and Competiveness (MINECO/FEDER) [MAT2015-64617-C2-2-R]
- Basque Government (ELKARTEK, Project CICE) [KK-2015/0000100]
- Spanish Ministry of Education, Culture and Sport (MECD)
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. (C) 2017 Elsevier B.V. All rights reserved.
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