Method of producing spherical lithium aluminate particles
AssigneeGA Technologies Inc.
InventorsLing Yang, Russell R. Medico, Wesley A. Baugh
Life of this patent
Estimating the term…
Abstract
Spherical particles of lithium aluminate are formed by initially producing aluminum hydroxide spheroids, and immersing the spheroids in a lithium ion-containing solution to infuse lithium ions into the spheroids. The lithium-infused spheroids are rinsed to remove excess lithium ion from the surface, and the rinsed spheroids are soaked for a period of time in a liquid medium to remove water and NH.sub.4 OH from their surfaces. The soaked spheroids are then dried and sintered to form lithium aluminate spherical particles.
Claims16
A method of forming lithium aluminate spheroids comprising:
- forming aluminum hydroxide gel spheroids,
- washing the gel spheroids with an aqueous solution to rid said spheroids of extraneous substances,
- immersing said aluminum hydroxide gel spheroids in a solution of between about 3N and about 5N LiOH to infuse lithium ions into said gel spheroids,
- rinsing said lithium-infused gel spheroids in an aqueous solution of between about 10 and about 28 weight percent ammonium hydroxide for about 5 to about 60 seconds to remove excess lithium ion from the surface thereof,
- soaking said lithium-infused gel spheroids in an organic liquid to remove said aqueous ammonium hydroxide solution,
- drying said lithium-infused gel spheroids, and
- sintering said lithium-infused gel spheroids at a temperature of between about 1000.degree. C. and about 1400.degree. C. to form lithium aluminate spheroids.
A method of forming lithium aluminate spheroids comprising:
- forming aluminum hydroxide gel spheroids,
- washing the gel spheroids with aqueous solution to rid said spheroids of extraneous substances,
- immersing said aluminum hydroxide gel spheroids in a solution of between about 3N and about 5N LiOH to infuse lithium ions into said gel spheroids,
- rinsing said lithium-infused gel spheroids in an aqueous ammonium hydroxide solution to remove excess lithium ion from the surface thereof,
- soaking said lithium-infused gel spheroids in an organic liquid to remove said aqueous solution,
- drying said lithium-infused gel spheroids, and
- sintering said lithium-infused gel spheroids at a temperature of between about 1000.degree. C. and about 1400.degree. C. to form lithium aluminate spheroids.
A method of forming lithium aluminate spheroids comprising:
- forming aluminum hydroxide gel spheroids,
- washing the gel spheroids with an aqueous ammonium hydroxide solution to rid said spheroids of extraneous substances,
- immersing said aluminum hydroxide gel spheroids in a solution of between about 3N and about 5N LiOH to infuse lithium ions into said gel spheroids,
- rinsing said lithium-infused gel spheroids in an aqueous ammonium hydroxide solution to remove excess lithium ion from the surface thereof,
- soaking said lithium-infused gel spheroids in isopropyl alcohol to remove said aqueous solution,
- drying said lithium-infused gel spheroids, and
- sintering said lithium-infused gel spheroids at a temperature of between about 1000.degree. C. and about 1400.degree. C. to form lithium aluminate spheroids.
Dependencies are inferred from the claim text.