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Flexible few-layered graphene for the ultrafast rechargeable aluminum-ion battery

Cited 89 time in Web of Science Cited 98 time in Scopus
Authors
Jung, Sung Chul; Kang, Yong-Ju; Yoo, Dong-Joo; Choi, Jang Wook; Han, Young-Kyu
Issue Date
2016-06
Citation
Journal of Physical Chemistry C, Vol.120 No.25, pp.13384-13389
Abstract
Fast ion transport is essential for high rate capability in rechargeable battery operation. Recently, an ultrafast rechargeable aluminum-ion battery was experimentally demonstrated through the reversible intercalation/deintercalation of chloroaluminate anions (AlCl4-) in graphitic-foam cathodes. Using first-principles calculations, herein, we report that the unique structural characteristic of graphitic foam, i.e., mechanical flexibility of few-layered graphene nanomaterials, plays a key role for the ultrafast aluminum-ion battery. We found that AlCl4- is stored by forming doubly stacked ionic layers in the interlayer space between graphene sheets, and their diffusivity increases dramatically once graphene film is less than five layers thick; the diffusivity beg-ins to increase when the film thickness reduces below five layers in such a way that the film thickness of four, three, and two graphene layers enables 48, 153, and 225 times enhanced diffusivity than that of the bulk graphite, respectively, and this nanoscale thickness is mainly responsible for the observed ultrafast rate capability of graphitic foam. The faster anion conductivity with the reduced film thickness is attributed to high elasticity of few-layered graphene, providing more space for facile AlCl4- diffusion. This study indicates that even bulky polyanions can be adopted as carrier ions for ultrahigh rate operation if highly elastic few-layered graphene is used as an active material.
ISSN
1932-7447
URI
http://hdl.handle.net/10371/164654
DOI
https://doi.org/10.1021/acs.jpcc.6b03657
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
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