US5601796A
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Method of making spinel LI2MN204 compound
Assignee: University of Oklahoma
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Filing: 1995-11-22
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Granted: 1997-02-11
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Expires: 2015-11-22
Abstract
Abstract A method of producing spinel Li 2 Mn 2 O 4 from LiMn 2 O 4 , lithium metal and graphite. A mixture of black LiMn 2 O 4 , lithium metal and carbon powders is prepared at a 1:1 molar ratio of Li to LiMn 2 O 4 and a 1:9 weight ratio of carbon to LiMn 2 O 4 . Then, the mixture is heated at a temperature between 170° C. and 200° C. until spinel Li 2 Mn 2 O 4 is produced. Alternatively, Li and carbon may be reacted together to produce LiC 6 or LiC 12 . Then the LiC x may be mixed and heated with LiMn 2 O 4 to produce spinel Li 2 Mn 2 O 4 .
Inventors
- 👤 Roger E. Frech
- 👤 Weiwei Huang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:48
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/36; H01M4/48; H01M4/50; H01M4/505; C; C01; C01G; C01G45/00; C01G45/12; C01G45/1221; C01G45/1242; C01P; C01P2002/00; C01P2002/30; C01P2002/32; C01P2002/70; C01P2002/72; C01P2002/80; C01P2002/82; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
147 words
A method for producing spinel Li 2 Mn 2 O 4 comprising the steps of: (a) mixing effective amounts of Li metal, LiMn 2 O 4 and a material capable of acting as a host for Li intercalation to form a mixture containing a molar ratio ranging from about 0.1:1 to about 1.5:1 of Li metal to LiMn 2 O 4 and containing a weight ratio ranging from about 1:15 to about 3:7 of the material capable of acting as a host for Li intercalation to LiMn 2 O 4 ; and (b) heating the mixture of Li metal, LiMn 2 O 4 and the material capable of acting as a host for lithium intercalation at a temperature of at least about 170° C., but not more than about 400° C. for a period of time effective to produce spinel Li 2 Mn 2 O 4 .
Claim 2
Independent Claim
147 words
A method for producing spinel Li 2 Mn 2 O 4 comprising the steps of: (a) mixing effective amounts of Li metal, LiMn 2 O 4 and a material capable of acting as a host for Li intercalation to form a mixture containing a molar ratio ranging from about 0.1:1 to about 1.5:1 of Li metal to LiMn 2 O 4 and containing a weight ratio ranging from about 1:15 to about 3:7 of the material capable of acting as a host for Li intercalation to LiMn 2 O 4 ; and (b) heating the mixture of Li metal, LiMn 2 O 4 and the material capable of acting as a host for lithium intercalation at a temperature of at least about 170° C., but not more than about 400° C. for a period of time effective to produce spinel Li 2 Mn 2 O 4 .
Claim 3
Dependent Claim
20 words
The method of claim 1 wherein the material capable of acting as a host for Li intercalation is a carbon.
Claim 4
Dependent Claim
42 words
The method of claim 1 wherein the mixture of Li metal, LiMn 2 O 4 and the material capable of acting as a host for Li contains a molar ratio of about 1:1 of Li metal to LiMn 2 O 4 .
Claim 5
Dependent Claim
50 words
The method of claim 1 wherein the material capable of acting as a host for Li intercalation is a carbon and wherein the mixture of Li metal, LiMn 2 O 4 and the carbon contains a weight ratio of about 1:9 of the carbon to LiMn 2 O 4 .
Claim 6
Dependent Claim
56 words
The method of claim 1 wherein the mixture of Li metal, LiMn 2 O 4 and the material capable of acting as a host for Li intercalation is heated at a temperature of about 200° C. and wherein the period of time effective to produce spinel Li 2 Mn 2 O 4 is about 48 hours.
Claim 7
Dependent Claim
107 words
The method of claim 1 wherein the material capable of acting as a host for Li intercalation is Lonza graphite and wherein the mixture of Li metal, LiMn 2 O 4 and Lonza graphite contains a molar ratio of about 1:1 of Li metal to LiMn 2 O 4 and a weight ratio of about 1:9 of Lonza graphite to LiMn 2 O 4 and wherein the mixture of Li metal, LiMn 2 O 4 and Lonza graphite is heated at a temperature of about 200° C. and wherein the period of time effective to produce spinel Li 2 Mn 2 O 4 is about 48 hours.
Claim 8
Independent Claim
159 words
A method for producing spinel Li 2 Mn 2 O 4 comprising the steps of: (a) mixing effective amounts of Li metal, and a carbon to form a mixture containing a molar ratio ranging between about 1:84 to about 1:4 of Li to carbon; (b) heating the mixture of Li metal and the carbon at a temperature between about 170° C. and 400° C. for a period of time effective to produce LiC x , wherein x ranges between about 6 to about 48; (c) mixing effective amounts of LiC x and LiMn 2 O 4 to form a mixture containing a molar ratio ranging between 0.1:1 to about 1.5:1 of LiC x to LiMn 2 O 4 ; and (d) heating the mixture of LiMn 2 O 4 and LiC x to a temperature between about 170° C. to about 400° C. for a period of time effective to produce spinel Li 2 Mn 2 O 4 .
Claim 9
Independent Claim
159 words
A method for producing spinel Li 2 Mn 2 O 4 comprising the steps of: (a) mixing effective amounts of Li metal, and a carbon to form a mixture containing a molar ratio ranging between about 1:84 to about 1:4 of Li to carbon; (b) heating the mixture of Li metal and the carbon at a temperature between about 170° C. and 400° C. for a period of time effective to produce LiC x , wherein x ranges between about 6 to about 48; (c) mixing effective amounts of LiC x and LiMn 2 O 4 to form a mixture containing a molar ratio ranging between 0.1:1 to about 1.5:1 of LiC x to LiMn 2 O 4 ; and (d) heating the mixture of LiMn 2 O 4 and LiC x to a temperature between about 170° C. to about 400° C. for a period of time effective to produce spinel Li 2 Mn 2 O 4 .
Claim 10
Dependent Claim
11 words
The method of claim 7 wherein the carbon is Lonza graphite.
Claim 11
Dependent Claim
37 words
The method of claim 7 wherein the mixture of Li metal and carbon is heated at a temperature of about 200° C. and wherein the period of time effective to produce LiC x is about 48 hours.
Claim 12
Dependent Claim
32 words
The method of claim 7 wherein the carbon is Lonza graphite and wherein the mixture of Li metal and Lonza graphite contains a molar ratio of 1:6 of Li to Lonza graphite.
Claim 13
Dependent Claim
32 words
The method of claim 7 wherein the mixture of LiC x and LiMn 2 O 4 contains a molar ratio of about 1:1 of LiC x to LiMn 2 O 4 .
Claim 14
Dependent Claim
72 words
The method of claim 7 wherein the mixture of LiC x and LiMn 2 O 4 contains a molar ratio of about 1:1 of LiC x to LiMn 2 O 4 and wherein the mixture of LiC x and LiMn 2 O 4 is heated to a temperature of about 200° C. and wherein the period of time effective to produce spinel Li 2 Mn 2 O 4 is about 48 hours.
Claim 15
Dependent Claim
134 words
The method of claim 7 wherein the carbon is Lonza graphite and wherein the mixture of Li metal and Lonza graphite contains a molar ratio of about 1:6 of Li metal to Lonza graphite and wherein the mixture of Li metal and carbon is heated at a temperature of about 200° C. and wherein the period of time effective to produce LiC x is about 48 hours and wherein the mixture of LiC x and LiMn 2 O 4 contains a molar ratio of about 1:1 of LiC x to LiMn 2 O 4 and wherein the mixture of LiC x and LiMn 2 O 4 is heated to a temperature of about 200° C. and wherein the period of time effective to produce spinel Li 2 Mn.sub. O 4 is about 48 hours.
Claim 16
Independent Claim
100 words
A method for producing spinel Li 2 Mn 2 O 4 comprising the steps of: (a) mixing effective amounts of LiC x , wherein x ranges between about 6 to about 48, and LiMn 2 O 4 to form a mixture containing a molar ratio ranging between 0.1:1 to about 1.5:1 of LiC x to LiMn 2 O 4 ; and (b) heating the mixture of LiMn 2 O 4 and LiC x to a temperature between about 170° C. to about 400° C. for a period of time effective to produce spinel Li 2 Mn 2 O 4 .
Claim 17
Independent Claim
100 words
A method for producing spinel Li 2 Mn 2 O 4 comprising the steps of: (a) mixing effective amounts of LiC x , wherein x ranges between about 6 to about 48, and LiMn 2 O 4 to form a mixture containing a molar ratio ranging between 0.1:1 to about 1.5:1 of LiC x to LiMn 2 O 4 ; and (b) heating the mixture of LiMn 2 O 4 and LiC x to a temperature between about 170° C. to about 400° C. for a period of time effective to produce spinel Li 2 Mn 2 O 4 .
Claim 18
Dependent Claim
32 words
The method of claim 14 wherein the mixture of LiC x and LiMn 2 O 4 contains a molar ratio of about 1:1 of LiC x to LiMn 2 O 4 .
Claim 19
Dependent Claim
72 words
The method of claim 14 wherein the mixture of LiC x and LiMn 2 O 4 contains a molar ratio of about 1:1 of LiC x to LiMn 2 O 4 and wherein the mixture of LiC x and LiMn 2 O 4 is heated to a temperature of about 200° C. and wherein the period of time effective to produce spinel Li 2 Mn 2 O 4 is about 48 hours.
Claim 20
Dependent Claim
45 words
The method of claim 14 wherein the mixture of LiC x and LiMn 2 O 4 is heated to a temperature of about 200° C. and wherein the period of time effective to produce spinel Li 2 Mn 2 O 4 is about 48 hours.
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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) | 2000-02-11 | 2000-08-12 | 2001-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-02-11 | 2004-08-12 | 2005-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-02-11 | 2008-08-12 | 2009-02-11 | $7700.00 | Window Closed / Lapsed |