High Capacity Adsorption―Dominated Potassium and Sodium Ion Storage in Activated Crumpled Graphene

Title
High Capacity Adsorption―Dominated Potassium and Sodium Ion Storage in Activated Crumpled Graphene
Authors
권석준이병용김명진김선경Jagjit Nanda장희동David Mitlin이승우
Keywords
graphene; crumpled; defect; adsorption
Issue Date
2020-05
Publisher
Advanced Energy Materials
Citation
VOL 10, NO 17-1903280
Abstract
Structurally and chemically defective activated­crumbled graphene (A­CG) is employed to achieve unique synergy of large reversible potassium (K) and sodium (Na) ion storage capacity with fast charging and extended cyclability. A­CG synthesis consists of low temperature spraying of graphene oxide slurry, followed by partial reduction annealing and air activation. For K storage, the reversible capacities are 340 mAh g?1 at 0.04 A g?1, 261 mAh g?1 at 0.5 A g?1, and 210 mAh g?1 at 2 A g?1. For Na storage, the reversible capacities are 280 mAh g?1 at 0.04 A g?1, 191 mAh g?1 at 0.5 A g?1, and 151 mAh g?1 at 2 A g?1. A­CG shows a stable intermediate rate (0.5 Ag?1) cycling with both K and Na, with minimal fade after 2800 and 8000 cycles. These are among the most favorable capacity―rate capability―cyclability combinations recorded for potassium­ion battery and sodium­ion battery carbons. Electroanalytical studies (cyclic voltammetry, galvanostatic intermittent titration technique, b­value) and
URI
http://pubs.kist.re.kr/handle/201004/71994
ISSN
1614-6832
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KIST Publication > Article
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