Sodium-ion electrochemical cells and batteries
AssigneeUchicago Argonne, LLC
InventorsChristopher S. Johnson, Hui Xiong, Tijana Rajh, Elena Shevchenko, Sanja Tepavcevic
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Abstract
The present invention provides a nanostructured metal oxide material for use as a component of an electrode in a sodium-ion battery. The material comprises a nanostructured titanium oxide film on a metal foil substrate, which can be produced by depositing or forming a nanostructured titanium dioxide material on the substrate, and then, optionally, charging and discharging the material in an electrochemical cell to improve the capacity and Coulombic efficiency thereof.
Claims12
A sodium-ion electrochemical cell prepared by providing an electrochemical cell comprising a cathode, an anode and a nonaqueous sodium-containing electrolyte therebetween, wherein the anode comprises a film of amorphous TiO2 nanotubes on a surface of a metal foil substrate;
- and wherein the nanotubes have a wall thickness of about 18 to 25 nm and an outer tubular diameter of about 100 to 150 nm;
- and charging and discharging the so-provided electrochemical cell between about 2.5 and 0.5 V vs. Na/Na+ at a rate of about 0.05 A/g for about 15 cycles;
- thereby increasing the capacity and Coulombic efficiency thereof relative to an initial capacity and Coulombic efficiency achieved during the first cycle.
Dependencies are inferred from the claim text.