Graphene paper with controlled pore structure for high-performance cathodes in Li-O-2 batteries

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In non-aqueous Li-O-2 batteries, relatively large amounts of discharge products are formed on air cathodes. As such, the expansion of air cathodes is a critical issue that remains to be solved. Here, we report the fabrication of highly porous free-standing graphene paper by introducing macropores within the paper using polystyrene colloidal particles as a sacrificial template. The as-prepared macroporous graphene paper (mp-GP) have a large BrunauereEmmetteTeller (BET) surface area (ca. 373 m(2) g(-1)), a large pore volume (ca. 10.9 cm(3) g(-1)), and a high porosity (91.6%). Owing to the high surface area and large pore volume, the mp-GPs exhibit a high specific capacity of ca. 12,200 mAh g(-1) at a current density of 200 mA g(-1), as well as good rate capability, when used as an air cathode in a non-aqueous Li-O-2 battery. Moreover, the mp-GP shows good stability up to 100 and 78 cycles at a current density of 500 mA g(-1) and 2000 mA g(-1) respectively, with a limiting capacity of 1000 mAh g(-1). It is found that formation and decomposition of the discharge product, Li2O2, occur within the macropores, and thus, the mp-GP maintains its original structure without considerable expansion during cycling.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2016-04
Language
English
Article Type
Article
Keywords

LITHIUM-OXYGEN BATTERIES; RATE CAPABILITY; DOPED GRAPHENE; AIR BATTERIES; CATALYSTS; STABILITY; COMPOSITE; CARBON; BINDER; OXIDE

Citation

CARBON, v.100, pp.265 - 272

ISSN
0008-6223
DOI
10.1016/j.carbon.2016.01.013
URI
http://hdl.handle.net/10203/207590
Appears in Collection
CBE-Journal Papers(저널논문)
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