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C 2015, 1(1), 27-42; doi:10.3390/c1010027

Graphene Nanosheets Based Cathodes for Lithium-Oxygen Batteries

Air Force Research Laboratory, Aerospace Systems Directorate, Wright-Patterson Air Force Base, Dayton, OH 45433-7252, USA
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Author to whom correspondence should be addressed.
Academic Editor: Rüdiger Schweiss
Received: 29 June 2015 / Revised: 16 September 2015 / Accepted: 14 October 2015 / Published: 20 October 2015
(This article belongs to the Special Issue Porous Carbon Materials for Electrochemical Power Sources)
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Abstract

Lithium-oxygen batteries have attracted considerable attention as a promising energy storage system. Although these batteries have many advantages, they face several critical challenges. In this work, we report the use of graphene nanosheets (GNSs), nitrogen-doped graphene nanosheets (N-GNSs), exfoliated nitrogen-doped graphene nanosheets (Ex-N-GNSs), and a blend of Ex-N-GNSs with nitrogen-doped carbon (Hybrid 1) as oxygen cathodes. These cathode materials were characterized by the Brunauer-Emmett-Teller (BET) surface area analysis, cyclic voltammetry (CV) and scanning electron microscopy (SEM). In order to mitigate safety issues, all solid-state cells were designed and fabricated using lithium aluminum germanium phosphate (LAGP) as ceramic electrolyte. The cathodes prepared from GNSs, N-GNSs, Ex-N-GNSs, and Hybrid 1 exhibit remarkable enhancement in cell capacity in comparison to conventional carbon cathodes. This superior cell performance is ascribed to beneficial properties arising from GNSs and nitrogen doped carbon. GNSs have unique morphology, higher oxygen reduction activity, whereas nitrogen-doped carbon has higher surface area. View Full-Text
Keywords: nitrogen-doped graphene nanosheets; oxygen reduction reaction; cyclic voltammetry; lithium-oxygen battery nitrogen-doped graphene nanosheets; oxygen reduction reaction; cyclic voltammetry; lithium-oxygen battery
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Kichambare, P.; Rodrigues, S. Graphene Nanosheets Based Cathodes for Lithium-Oxygen Batteries. C 2015, 1, 27-42.

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