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Structural effect on electrochemical performance of ordered porous carbon electrodes for Na-ion batteries

Cited 48 time in Web of Science Cited 49 time in Scopus
Authors
Jo, Changshin; Park, Yuwon; Jeong, Jooyoung; Lee, Kyu Tae; Lee, Jinwoo
Issue Date
2015-06
Citation
ACS Applied Materials and Interfaces, Vol.7 No.22, pp.11748-11754
Keywords
sodium ion batteryelectrodeporous carbonself-assemblynanomaterials
Abstract
Ordered meso- or macro-porous carbons (OMCs) were applied as anodes in Na ion battery (NIB) systems. Three different block copolymers (BCPs) enabled us to control the pore sizes (6, 33, and 60 nm) while maintaining the same 2-D hexagonal structure. To exclude other effects, the factors including precursors, particle sizes, and degrees of graphitization were controlled. The structures of OMCs were characterized by nitrogen physisorption, Raman spectroscopy, X-ray analyses (XRD and SAXS), and microscopies (TEM and SEM). With a galvanostatic charge/discharge, we confirmed that OMC electrode with medium pore size (OMC-33) exhibited a higher reversible capacity of 134 mA h g(-1) (at 20th cycle) and faster rate capability (61% retention, current densities from 50 to 5000 mA g(-1) than those of OMC-6, and OMC-60 electrodes. The high performance of OMC-33 is attributed to the combined effects of pore size and wall thickness which was supported by charge/discharge and electrochemical impedance spectroscopy (EIS) analyses.
ISSN
1944-8244
URI
https://hdl.handle.net/10371/171856
DOI
https://doi.org/10.1021/acsami.5b03186
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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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