Redox processes in sodium vanadium phosphate cathodes - insights from operando magnetometry

Operando magnetic susceptibility measurements of sodium ion cathode materials during repetitive electrochemical cycling enable a continuous and bulk sensitive monitoring of the transition metal oxidation states. Such measurements on NaxV2(PO4)3 identified vanadium to be the only ion undergoing oxida...

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Bibliographic Details
Published in:Physical chemistry chemical physics : PCCP 2019, Vol.21 (36), p.20151-20155
Main Authors: Klinser, Gregor, Zettl, Roman, Wilkening, Martin, Krenn, Heinz, Hanzu, Ilie, Würschum, Roland
Format: Article
Language:English
Subjects:
Battery chargers
Battery cycles
Cathodes
Charging
Electrode materials
Magnetic measurement
Magnetic permeability
Oxidation
Transition metals
Vanadium
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Summary:Operando magnetic susceptibility measurements of sodium ion cathode materials during repetitive electrochemical cycling enable a continuous and bulk sensitive monitoring of the transition metal oxidation states. Such measurements on NaxV2(PO4)3 identified vanadium to be the only ion undergoing oxidation/reduction processes upon battery operation. For the initial battery charging-discharging cycle as well as for the first cycle after prolonged room temperature storage, however, peculiarities within the magnetic susceptibility measurements indicate parasitic side reactions, likely on the cathode surface.
ISSN:1463-9076
1463-9084
DOI:10.1039/c9cp04045e