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Vanadium pentoxide/carbide-derived carbon core-shell hybrid particles for high performance electrochemical energy storage

  • A novel, two step synthesis is presented combining the formation of carbide-derived carbon (CDC) and redox-active vanadium pentoxide (V2O5) in a core-shell manner using solely vanadium carbide (VC) as the precursor. In a first step, the outer part of VC particles is transformed to nanoporous CDC owing to the in situ formation of chlorine gas from NiCl2 at 700 [degree]C. In a second step, the remaining VC core is calcined in synthetic air to obtain V2O5/CDC core-shell particles. Materials characterization by means of electron microscopy, Raman spectroscopy, and X-ray diffraction clearly demonstrates the partial transformation from VC to CDC, as well as the successive oxidation to V2O5/CDC core-shell particles. Electrochemical performance was tested in organic 1 M LiClO4 in acetonitrile using half- and asymmetric full-cell configuration. High specific capacities of 420 mA h g-1 (normalized to V2O5) and 310 mA h g-1 (normalized to V2O5/CDC) were achieved. The unique nanotextured core-shell architecture enables high power retention with ultrafast charging and discharging, achieving more than 100 mA h g-1 at 5 A g-1 (rate of 12C). Asymmetric cell design with CDC on the positive polarization side leads to a high specific energy of up to 80 W h kg-1 with a superior retention of more than 80% over 10 000 cycles and an overall energy efficiency of up to 80% at low rates.

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Document Type:Article
Author:Marco ZeigerORCiD, Teguh Ariyanto, Benjamin KrunerORCiD, Nicolas J. Peter, Simon FleischmannORCiD, Bastian J. M. EtzoldORCiD, Volker PresserORCiD
Parent Title (English):Journal of Materials Chemistry A
First Page:18899
Last Page:18909
Year of first Publication:2016
Release Date:2022/11/18
Impact:08.867 (2016)
Funding Information:German Federal Ministry for Research and Education (BMBF) in support of the nanoEES3D project (award number 03EK3013); German Federal Ministry of Education and Research (BMBF) under the project AktivCAPs (award number 02E2-ESP077) and the German Research Council (DFG), which, within the framework of its “Excellence Initiative”, supports the Cluster of Excellence “Engineering of Advanced Materials”
Open Access:Open Access
Signature:INM 2016/119
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International