期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 22, 页码 11748-11754出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b03186
关键词
sodium ion battery; electrode; porous carbon; self-assembly; nanomaterials
资金
- National Research Foundation (NRF) - Ministry of Science, ICT and Future Planning [2012R1A2A2A01002879, 2013R1A1A2074550]
- 'Technology Development of Marine Industrial Biomaterials' - Ministry of Oceans and Fisheries, Korea
- National Research Foundation of Korea [2013R1A1A2074550] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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.
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