Important Role of Functional Groups for Sodium Ion Intercalation in Expanded Graphite

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Expanded graphite oxide (GO) has recently received a great deal of attention as a sodium ion battery anode due to its superior characteristics for sodium ion storage. Here, we report that the sodium ion intercalation behavior of expanded GO strongly depends on the amounts and ratios of different functional groups. The epoxide-rich GO shows significantly higher specific capacities than those of the hydroxyl-rich counterpart utilizing strong sodium-epoxide attractions and appropriately enlarged interlayer spacing during sodiation. The epoxide-rich GO also enables fast sodium ion transport on account of the diminishment of interlayer hydrogen bonds that could reduce the free volume. Our calculations suggest that the theoretical capacity of epoxide-only GO with a stoichiometry of Na2.5C6O3 can reach 930 mAh g(-1) which is far higher than recent experimental results as well as even those of conventional graphite materials in lithium ion batteries.
Publisher
AMER CHEMICAL SOC
Issue Date
2015-08
Language
English
Article Type
Article
Citation

CHEMISTRY OF MATERIALS, v.27, no.15, pp.5402 - 5406

ISSN
0897-4756
DOI
10.1021/acs.chemmater.5b02024
URI
http://hdl.handle.net/10203/205631
Appears in Collection
EEW-Journal Papers(저널논문)
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