Patent US5370710A successfully refreshed from Google Patents.
US5370710A
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Nonaqueous electrolyte secondary cell
Assignee: Sony Corp
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Filing: 1993-06-29
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Granted: 1994-12-06
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Expires: 2013-06-29
Abstract
Abstract A nonaqueous electrolyte secondary cell provided with (a) a negative electrode consisting essentially of a carrier for a negative electrode active material , said carrier being capable of being doped and dedoped with lithium, (b) a positive electrode comprising, as an essential positive electrode active material, Li1+xMn2O4, wherein x>0, obtained by doping a lithium-manganese complex oxide with lithium and (c) a nonaqueous electrolyte. The secondary cell has an increased cell capacity as well as a high energy density and an excellent charge-discharge characteristics .
Inventors
- 👤 Toru Nagaura
- 👤 Hisayuki Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:27
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/13; H01M4/131; H01M10/00; H01M10/05; H01M4/36; H01M4/48; H01M4/50; H01M4/505; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49108
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
69 words
A method for manufacturing a nonaqueous electrolyte secondary cell comprising the steps of: a) providing LiMn 2 O 4 ; b) doping the LiMn 2 O 4 with lithium to produce a positive electrode active material of Li 1+x Mn 2 O 4 wherein x>0; and c) combining the positive electrode material with a negative electrode active material and a nonaqueous electrolyte to form the nonaqueous electrolyte secondary cell.
Claim 2
Independent Claim
69 words
A method for manufacturing a nonaqueous electrolyte secondary cell comprising the steps of: a) providing LiMn 2 O 4 ; b) doping the LiMn 2 O 4 with lithium to produce a positive electrode active material of Li 1+x Mn 2 O 4 wherein x>0; and c) combining the positive electrode material with a negative electrode active material and a nonaqueous electrolyte to form the nonaqueous electrolyte secondary cell.
Claim 3
Dependent Claim
28 words
A method according to claim 1, wherein the step of doping comprises chemical doping by reacting the LiMn 2 O 4 material with a lithium compound forming agent.
Claim 4
Dependent Claim
36 words
A method according to claim 1, wherein the step of doping comprises an electrochemical doping by placing the LiMn 2 O 4 in the presence of an organic electrolyte solution containing lithium and creating a discharge.
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) | 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 |