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US4720910A
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Method for preparing encapsulated cathode material
Assignee: MHB Joint Venture
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Filing: 1987-06-16
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Granted: 1988-01-26
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Expires: 2007-06-16
Abstract
Abstract A method for preparing a cathode material is provided. An insertion compound is ground until small particles of the insertion compound are formed. The insertion compound particles are encapsulated in an electronic and ionic conducting polymer to form the cathode material by using a spray dryer.
Inventors
- 👤 John K. Rourke
- 👤 Gerhart Schwab
- 👤 Dale R. Shackle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:51
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/04; H01M4/0402; H01M4/0416; H01M4/0404; H01M4/0419; H01M4/043; H01M4/36; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49108; Y10T29/49115
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
62 words
A method for preparing a cathode material comprising the steps of: forming a dispersion of an insertion compound, and an inorganic salt in a solution of a polymer in a volatile solvent, and spray drying said dispersion to remove said solvent and thereby form particles having said insertion compound as a core material encapsulated in a polymeric shell containing said inorganic salt.
Claim 2
Independent Claim
62 words
A method for preparing a cathode material comprising the steps of: forming a dispersion of an insertion compound, and an inorganic salt in a solution of a polymer in a volatile solvent, and spray drying said dispersion to remove said solvent and thereby form particles having said insertion compound as a core material encapsulated in a polymeric shell containing said inorganic salt.
Claim 3
Dependent Claim
17 words
The method of claim 1 wherein said insertion compound is a transition metal oxide, sulfide, or selenide.
Claim 4
Dependent Claim
13 words
The method of claim 2 wherein said insertion compound is a vanadium oxide.
Claim 5
Dependent Claim
27 words
The method of claim 3 wherein said inorganic salt is a salt selected from the group consisting of lithium salt, sodium salt, potassium salt, and ammonium salt.
Claim 6
Dependent Claim
59 words
The method of claim 4 wherein said inorganic salt is a salt of an anion selected from the group consisting of I - , Br - , SCN - , ClO 4 - , BF 4 - , PF 6 - , AsF 6 - , CF 3 CO 2 - , and CF 3 SO 3 - .
Claim 7
Dependent Claim
13 words
The method of claim 4 wherein said slurry additionally includes a conductive filler.
Claim 8
Dependent Claim
12 words
The method of claim 6 wherein said conductive filler is carbon black.
Claim 9
Dependent Claim
12 words
The method of claim 5 wherein said salt is a lithium salt.
Claim 10
Dependent Claim
11 words
The method of claim 8 wherein said polymer is poly(ethylene oxide).
Claim 11
Dependent Claim
19 words
The method of claim 1 wherein said insertion compound has a particle size of about 1 to 5 microns.
Claim 12
Dependent Claim
18 words
The method of claim 1 wherein said particles have a particle size of about 2 to 20 microns.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-01-25 | 1991-07-27 | 1992-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-25 | 1995-07-27 | 1996-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-25 | 1999-07-27 | 2000-01-26 | $7700.00 | Window Closed / Lapsed |