期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 3, 期 22, 页码 11807-11816出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ta00976f
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资金
- German Federal Ministry of Education and Research (BMBF) [FKZ 03EK3021]
Nanostructured Li3V2-xNix(PO4)(3)(x = 0, 0.05, and 0.1) cathode materials, with a mean particle dimension ranging from 200 to 63 nm, are successfully synthesized with poly(acrylic acid) and D-(+)-glucose as carbon sources. All three samples show a monoclinic crystalline structure as confirmed by X-ray diffraction and Rietveld analysis. Ni-doping improves the specific capacity of Li3V2(PO4)(3)/C. Between 3.0 and 4.3 V vs. Li+/Li, all cathodes exhibit good rate capability, even at high C-rates. For these reasons, they are good candidates for high power and energy applications, in particular for the development of high energy density supercapacitors. Li3V1.95Ni0.05(PO4)(3)/C, because of its highest specific discharge capacity (93 mA h g(-1) at 100 C) and capacity retention of 97% after 1000 cycles, is selected for building an asymmetric supercapacitor with activated carbon as the anode. At a power density of 2.8 kW L-1, the asymmetric system delivers 18.7 W h L-1, a value five orders of magnitude higher than that of the symmetric capacitor at the same power level.
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