標題: High Power Na3V2(PO4)(3)@C/AC Bi-material Cathodes for Hybrid Battery-Capacitor Energy Storage Devices
作者: Akhtar, Mainul
Chang, Jeng-Kuei
Majumder, S. B.
材料科學與工程學系
Department of Materials Science and Engineering
關鍵字: Bi-material electrode;Na3V2(PO4)(3)@C;AC;Rate performance;Hybrid bat-cap;Impedance spectroscopy;Cyclic voltammetry
公開日期: 8-一月-2020
摘要: We have reported the synthesis and electrochemical characteristics of carbon-coated sodium vanadium phosphate/activated carbon (NVP@C/AC) bi-material electrodes. We have reported that bi-material type NVP@C/AC cathodes offer superior rate performance as compared to either NVP@C or AC electrodes. Through a detailed impedance spectroscopy analyses, we demonstrated that the synergic effect observed in the bi-material electrodes correlates well with the lowering of their charge transfer resistances (R-CT) and the increase of Li(+)diffusion coefficient (DLi+) with the increase of activated carbon content from 0 to 0.60 weight fraction. Through a detailed cyclic voltammogram analyses we have delineated the faradaic and capacitive contribution towards the overall capacities of the bi-material electrodes at various rate conditions. For both these bi-materials, irrespective of the AC content and rate, capacitive contribution dominates the overall capacity. NVP@C/AC40 yields discharge capacities of 67 and 40 mAh g(-1)with capacity retention of more than 93% and 67% after 500 cycles measured at 50 and 1000 mA g(-1), respectively. These bi-materials are demonstrated to be excellent material candidates for high power density lithium titanium oxide (LTO)//NVP@C/AC hybrid battery-capacitor (bat-cap) energy storage devices.
URI: http://dx.doi.org/10.1149/1945-7111/aba36d
http://hdl.handle.net/11536/155220
ISSN: 0013-4651
DOI: 10.1149/1945-7111/aba36d
期刊: JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume: 167
Issue: 11
起始頁: 0
結束頁: 0
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