In Situ Activation of Nitrogen-Doped Graphene Anchored on Graphite Foam for a High-Capacity Anode

We report the fabrication of a three-dimensional free-standing nitrogen-doped porous graphene/graphite foam by in situ activation of nitrogen-doped graphene on highly conductive graphite foam (GF). After in situ activation, intimate “sheet contact” was observed between the graphene sheets and the GF...

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Veröffentlicht in:ACS nano 2015-08, Vol.9 (8), p.8609-8616
Hauptverfasser: Ji, Junyi, Liu, Jilei, Lai, Linfei, Zhao, Xin, Zhen, Yongda, Lin, Jianyi, Zhu, Yanwu, Ji, Hengxing, Zhang, Li Li, Ruoff, Rodney S
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container_end_page 8616
container_issue 8
container_start_page 8609
container_title ACS nano
container_volume 9
creator Ji, Junyi
Liu, Jilei
Lai, Linfei
Zhao, Xin
Zhen, Yongda
Lin, Jianyi
Zhu, Yanwu
Ji, Hengxing
Zhang, Li Li
Ruoff, Rodney S
description We report the fabrication of a three-dimensional free-standing nitrogen-doped porous graphene/graphite foam by in situ activation of nitrogen-doped graphene on highly conductive graphite foam (GF). After in situ activation, intimate “sheet contact” was observed between the graphene sheets and the GF. The sheet contact produced by in situ activation is found to be superior to the “point contact” obtained by the traditional drop-casting method and facilitates electron transfer. Due to the intimate contact as well as the use of an ultralight GF current collector, the composite electrode delivers a gravimetric capacity of 642 mAh g–1 and a volumetric capacity of 602 mAh cm–3 with respect to the whole electrode mass and volume (including the active materials and the GF current collector). When normalized based on the mass of the active material, the composite electrode delivers a high specific capacity of up to 1687 mAh g–1, which is superior to that of most graphene-based electrodes. Also, after ∼90 s charging, the anode delivers a capacity of about 100 mAh g–1 (with respect to the total mass of the electrode), indicating its potential use in high-rate lithium-ion batteries.
doi_str_mv 10.1021/acsnano.5b03888
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subjects Activation
Contact
Electrodes
Foams
Graphene
Graphite
Particulate composites
Rechargeable batteries
title In Situ Activation of Nitrogen-Doped Graphene Anchored on Graphite Foam for a High-Capacity Anode
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