Process for making lithium titanate

Patent 6890510 Issued on May 10, 2005. Estimated Expiration Date:

July 19, 2022. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

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Inventors

Assignee

Altair Nanomaterials Inc.

Application

No. 10199212 filed on 07/19/2002

US Classes:

423/598, Titanium (e.g., titanate, etc.)429/231.5Vanadium (V), chromium (Cr), niobium (Nb), molybdenum (Mo), titanium (Ti), or tungsten (W) component is active material

Examiners

Primary: Langel, Wayne A.
Assistant: Strickland, Jonas N.

Attorney, Agent or Firm

Foreign Patent References

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0 016 583 EP 10/01/1980
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WO 01 60515 WO 08/01/2001
WO 0246101 WO 06/01/2002

International Classes

C01G023/00
H01M004/58
H01M008/14
C01G023/00

Abstract

A process is provided for making lithium titanate of closely controlled particle size in the range 5 nm to 2000 nm. The process includes re-firing lithium titanate under controlled conditions so that crystallites of the desired particle size are grown. The lithium titanate may be derived from any suitable source. A suitable source of lithium titanate can be from a process that includes evaporation of a blend that contains lithium and titanium to form a mixture containing lithium and titanium compounds that are subsequently calcined to form lithium titanate. The blend of titanium and lithium may be derived from a variety of titanium and lithium precursor materials.

Other References

Patent Abstracts of Japan, vol. 007, No. 086 (C-161), Apr. 9, 1983 & JP 58 015031 A (Taijirou Okabe), Jan. 28, 1983 abstract.
Peramunage D. et al., “Preparation and Battery Applications of Micron Sized Ll₄Tl₅O₁₂,” Materials Research Society Symposium Proceedings, Materials Research Society, Pittsburgh, PA., U.S., vol. 498, No. 496, 1998, pp. 359-365.
Peramunage and Al. D, “Preparation of Micron-Sized Ll₄Tl₅O₁₂, and its Electrochemistry in Polyacrlonitrile Electrolyte Based Lithium Cells”, Journal of the Electrochemical Society, Electrochemical Society, Manchester, New Hampshire, U.S., vol. 145, No. 8, Aug. 1998, pp. 2609-2615.