Journal
MATERIALS ADVANCES
Volume 3, Issue 18, Pages 6993-7001Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2ma00031h
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Funding
- MEXT, Japan (ESICB program) [JPMXP0112101003]
- JSPS (KAKENHI) [JP20H05297]
- MEXT, Japan (Five-star Alliance)
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In this research, a eldfellite-type material containing V as a transition metal, NaV(SO4)(2), was investigated to achieve higher potentials and capacities through the use of a multi-redox pair. The involvement of both V and O was found to contribute to the desodiation/sodiation process at high potentials.
In this research, an eldfellite-type material containing V as a transition metal, NaV(SO4)(2), was investigated to achieve higher potentials and capacities through the use of a multi-redox pair. Average working potentials of 3.9 and 2.1 V vs. Na/Na+ were observed, and a large reversible capacity of 102 mA h g(-1) was obtained over a wide potential range. Moreover, X-ray absorption near-edge structure and near-edge X-ray absorption fine structure measurements revealed that only V contributes to the charge compensation in the sodiation/desodiation process at low potentials, whereas both V and O contribute to the desodiation/sodiation process at high potentials. This phenomenon was also supported by the density of states and Bader charge analysis based on the DFT calculations.
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