US5370948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for production of positive electrode active material for nonaqueous electrolyte lithium secondary cell
Assignee: Panasonic Holdings Corp
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Filing: 1993-01-19
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Granted: 1994-12-06
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Expires: 2013-01-19
Abstract
Abstract A process for the production of LiNi 1-x Mn x O 2 (0.005≦×≦0.45) as a positive electrode active material for a nonaqueous lithium secondary cell comprising a) mixing aqueous solutions of a lithium salt, a nickel salt and manganese nitrate, b) heating with stirring the solution to dryness and c) pre-calcining from 250° C. to 400° C., grinding and mixing the product and finally calcining from 600° C. to 900° C.
Inventors
- 👤 Masaki Hasegawa
- 👤 Hiroyuki Murai
- 👤 Shuji Ito
- 👤 Yasuhiko Bito
- 👤 Yoshinori Toyoguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:19
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/13; H01M4/131; C; C01; C01G; C01G53/00; C01G53/40; C01G53/42; C01G53/44; C01G53/50; H01M10/00; H01M10/05; H01M10/056; H01M4/36; H01M4/48; H01M4/485; C01P; C01P2002/00; C01P2002/50; C01P2002/52; C01P2002/54; C01P2002/70; C01P2002/72; C01P2002/74; C01P2006/00; C01P2006/40; H01M6/00; H01M6/14; H01M6/16; H01M6/162; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y02P; Y02P70/00; Y02P70/50
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
127 words
A process for the production of LiNi 1-x Mn x O 2 (0.05≦×≦0.45) as a positive electrode active material for a nonaqueous lithium secondary cell which has a crystal structure of a hexagonal system and exhibits a peak of the (110) plane in an X-ray diffraction pattern using Cu-Kα at 2θ in a range of 64.42° to 65.00°, comprising the steps of: a. mixing aqueous solutions of a lithium salt, a nickel salt and manganese nitrate; b. heating with stirring the mixed aqueous solution to dryness followed by: c. a thermal treatment comprising pre-calcining at a temperature within the range of 250° C. to 400° C., grinding and mixing said pre-calcined product and then calcining at a temperature within the range of 600° C. to 900° C.
Claim 2
Dependent Claim
127 words
A process for the production of LiNi 1-x Mn x O 2 (0.05≦×≦0.45) as a positive electrode active material for a nonaqueous lithium secondary cell which has a crystal structure of a hexagonal system and exhibits a peak of the (110) plane in an X-ray diffraction pattern using Cu-Kα at 2θ in a range of 64.42° to 65.00°, comprising the steps of: a. mixing aqueous solutions of a lithium salt, a nickel salt and manganese nitrate; b. heating with stirring the mixed aqueous solution to dryness followed by: c. a thermal treatment comprising pre-calcining at a temperature within the range of 250° C. to 400° C., grinding and mixing said pre-calcined product and then calcining at a temperature within the range of 600° C. to 900° C.
Claim 3
Dependent Claim
24 words
The process according to claim 1, wherein lithium hydroxide is used as the lithium salt and nickel nitrate is used as the nickel salt.
Claim 4
Dependent Claim
31 words
The process according to claim 1, wherein at least one of nickel carbonate and nickel hydroxide is used as the nickel salt and lithium nitrate is used as the lithium salt.
Claim 5
Dependent Claim
26 words
The process according to claim 1, wherein the thermal treatment is carried out in an oxidizing atmosphere selected from an air atmosphere and an oxygen atmosphere.
References Cited (Backward Citations)
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US4567031A
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EP0345707A1
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EP0468942A2
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US5264201A
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US5169736A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-12-05 | 1998-06-06 | 1998-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-12-05 | 2002-06-06 | 2002-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-12-05 | 2006-06-06 | 2006-12-06 | $7700.00 | Window Closed / Lapsed |