Back to results
US 11,642,723 B2Granted
Metallic foam anode coated with active oxide material
AssigneeCellMobility, Inc.
InventorsHyeji Park, Hyelim Choi, Yumi Rho, Heeman Choe
Life of this patent
Estimating the term…
Abstract
A three-dimensional metallic foam is fabricated with an active oxide material for use as an anode for lithium batteries. The porous metal foam, which can be fabricated by a freeze-casting process, is used as the anode current collector of the lithium battery. The porous metal foam can be heat-treated to form an active oxide material to form on the surface of the metal foam. The oxide material acts as the three-dimensional active material that reacts with lithium ions during charging and discharging.
Claims21
A method comprising:
- pouring a titanium metal slurry on a copper rod that is standing in a vessel under liquid nitrogen;
- freezing the metal slurry where titanium metal particles are piled up and physically attached between growing ice crystals;
- forming a porous green-body by drying the ice crystals of the frozen slurry at sufficiently low temperature, leaving pores in place of the ice crystals with physical attachment, wherein the sufficiently low temperature comprises any temperature at or below freezing;
- constructing a porous metal foam by reducing and sintering the porous green-body in a vacuum comprising
- reducing the porous green-body at 300 degrees Celsius for 3 hours, and
- sintering the porous green-body at 1100 degrees Celsius for 7 hours;
- and
- forming an anatase oxidation layer for the porous metal foam comprising
- presoaking the porous metal foam in hydrogen peroxide at 100 degrees Celsius or more for 3 or more hours, and
- after the presoaking, oxidizing the porous metal foam in an air furnace in a single heat-treatment step at from 400 degrees Celsius to 800 degrees Celsius to obtain the anatase oxidation layer.
7 more elements
A method comprising:
- pouring a titanium metal slurry on a copper rod that is standing in a vessel under liquid nitrogen;
- freezing the metal slurry where titanium metal particles are piled up and physically attached between growing ice crystals;
- forming a porous green-body by drying the ice crystals of the frozen slurry at sufficiently low temperature, leaving pores in place of the ice crystals with physical attachment, wherein the sufficiently low temperature comprises any temperature at or below freezing;
- constructing a porous metal foam by reducing and sintering the porous green-body in a vacuum comprising a reduction at a first temperature and a sintering at a second temperature, above the first temperature;
- and
- forming an anatase oxidation layer for the porous metal foam consisting of
- presoaking the porous metal foam in hydrogen peroxide, and
- after the presoaking, heating the porous metal foam at a third temperature in an air furnace, wherein the third temperature is between the first and second temperatures, and the third temperature is from 400 degrees Celsius to 800 Celsius degrees.
5 more elements
A method comprising:
- pouring a titanium metal slurry on a copper rod that is standing in a vessel under liquid nitrogen;
- freezing the metal slurry where titanium metal particles are piled up and physically attached between growing ice crystals;
- forming a porous green-body by drying the ice crystals of the frozen slurry at sufficiently low temperature, leaving pores in place of the ice crystals with physical attachment, wherein the sufficiently low temperature comprises any temperature at or below freezing;
- constructing a porous metal foam by reducing and sintering the porous green-body in a vacuum comprising a reduction at a first temperature for a T1 time period and a sintering at a second temperature, above the first temperature, for a T2 time period;
- and
- forming an anatase oxidation layer for the porous metal foam consisting of
- presoaking the porous metal foam in hydrogen peroxide for a T3 time period, and
- after the presoaking, heating the porous metal foam at a third temperature for a T4 time period in an air furnace, wherein the third temperature is between the first and second temperatures, and
- the first temperature is 200 degrees Celsius or more and below the second and third temperatures, the second temperature is 1100 degrees Celsius or more, and the third temperature is from 400 degrees Celsius to 800 Celsius degrees.
6 more elements
Dependencies are inferred from the claim text.