Fabrication of highly textured lithium cobalt oxide films by rapid thermal annealing

• US 6,555,270 B2
• Filed: 03/27/2001
• Issued: 04/29/2003
• Est. Priority Date: 09/15/1999
• Status: Expired due to Term

• Current Assignee: UT-Battelle LLC
• Original Assignee: Lockheed Martin Energy Research Corporation (Martin Marietta Corporation)
• Inventors: Bates, John B.
• Primary Examiner(s): Ryan, Patrick
• Assistant Examiner(s): Martin, Angela J.
• Application Number:
  US09/818,465
• Publication Number:
  US 20010014423A1
• Time in Patent Office: 763 Days
• Field of Search: 429/231.3, 429/231.95, 429/218.1, 252/182.1
• US Class Current: 429/231.3
• CPC Class Codes: C01G 51/42 containing alkali metals, e.g. LiCoO2
• CPC Class Codes: C01P 2002/72 by d-values or two theta-values, e.g. as X-ray diagram
• CPC Class Codes: C01P 2002/74 by peak-intensities or a ratio thereof only
• CPC Class Codes: H01M 4/04 Processes of manufacture in general
• CPC Class Codes: H01M 4/0404 by coating on electrode collectors
• CPC Class Codes: H01M 4/0426 Sputtering
• CPC Class Codes: H01M 4/0471 involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis
• CPC Class Codes: H01M 4/131 Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
• CPC Class Codes: H01M 4/485 of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy H01M4/505, H01M4/525 take precedence
• CPC Class Codes: H01M 4/52 of nickel, cobalt or iron
• CPC Class Codes: H01M 4/525 of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

Systems and methods are described for fabrication of highly textured lithium cobalt oxide films by rapid thermal annealing. A method of forming a lithium cobalt oxide film includes depositing a film of lithium cobalt oxide on a substrate; rapidly heating the film of lithium cobalt oxide to a target temperature; and maintaining the film of lithium cobalt oxide at the target temperature for a target annealing time of at most, approximately 60 minutes. The systems and methods provide advantages because they require less time to implement and are, therefore less costly than previous techniques.

Claims

1. A composition, comprising:

a film of LiCoO₂ on a substrate wherein a majority of grains are oriented with their (101) and (104) planes parallel to the substrate.

2. The composition of claim 1, wherein the film is thicker than 0.5 microns.

3. The composition of claim 2, wherein the film is thicker than about 1 micron.

4. The composition of claim 1, wherein the substrate includes at least one material selected from the group consisting of ceramics, semiconductors, and metals.

5. A cathode comprising the composition of claim 1.

6. A battery comprising the cathode of claim 5.