Patent US6136287A successfully refreshed from Google Patents.
US6136287A
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Lithium manganese oxides and batteries
Assignee: Neophotonics Corp
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Filing: 1998-12-02
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Granted: 2000-10-24
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Expires: 2018-12-02
Abstract
Abstract Lithium manganese oxide particles have been produced with an average diameter less than about 250 nm. The particles have a high degree of uniformity. The particles are formed by the heat treatment of nanoparticles of manganese oxide. The lithium manganese oxide particles are useful as active materials in the positive electrodes of lithium based batteries. Improved batteries result from the use of the uniform nanoscale lithium manganese oxide particles.
Inventors
- 👤 Craig R. Horne
- 👤 Sujeet Kumar
- 👤 Hariklia Dris Reitz
- 👤 James T. Gardner
- 👤 Xiangxin Bi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:50
CPC Classifications
C; C01; C01G; C01G45/00; C01G45/12; C01G45/1221; C01G45/1242; B; B82; B82Y; B82Y30/00; C01G45/02; C01G45/022; C01G45/1292; H; H01; H01M; H01M4/00; H01M4/02; H01M4/36; H01M4/48; H01M4/485; H01M4/50; H01M4/52; H01M4/525; C01P; C01P2002/00; C01P2002/02; C01P2002/70; C01P2002/72; C01P2002/77; C01P2004/00; C01P2004/01; C01P2004/04; C01P2004/51; C01P2004/52; C01P2004/60; C01P2004/62; C01P2004/64; C01P2004/80; C01P2006/00; C01P2006/40; H01M4/13; H01M4/131; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
64 words
A collection of particles comprising lithium manganese oxide, the collection of particles having an average diameter less than about 250 nm, wherein the collection of particles have a distribution of particle sizes in which at least about 95 percent of the particles have a diameter greater than about 40 percent of the average diameter and less than about 160 percent of the average diameter.
Claim 2
Dependent Claim
64 words
A collection of particles comprising lithium manganese oxide, the collection of particles having an average diameter less than about 250 nm, wherein the collection of particles have a distribution of particle sizes in which at least about 95 percent of the particles have a diameter greater than about 40 percent of the average diameter and less than about 160 percent of the average diameter.
Claim 3
Dependent Claim
24 words
The collection of particles of claim 1 wherein the collection of particles have an average diameter from about 5 nm to about 100 nm.
Claim 4
Dependent Claim
24 words
The collection of particles of claim 1 wherein the collection of particles have an average diameter from about 5 nm to about 25 nm.
Claim 5
Dependent Claim
24 words
The collection of particles of claim 1 wherein the lithium manganese oxide has an approximate stoichiometry of LiMn 2 O x , where x≧3.8.
Claim 6
Dependent Claim
18 words
The collection of particles of claim 1 wherein the lithium manganese oxide has a cubic spinel crystal structure.
Claim 7
Dependent Claim
27 words
The collection of particles of claim 1 wherein the collection of particles includes effectively no particles with a diameter greater than about four times the average diameter.
Claim 8
Dependent Claim
50 words
The collection of particles of claim 1 wherein the collection of particles have a distribution of particle sizes in which at least about 95 percent of the particles have a diameter greater than about 60 percent of the average diameter and less than about 140 percent of the average diameter.
Claim 9
Independent Claim
34 words
A method of making lithium manganese oxide particles comprising heating a mixture of manganese monoxide (MnO) particles and a lithium compound, the manganese monoxide particles having an average diameter less than about 250 nm.
Claim 10
Independent Claim
34 words
A method of making lithium manganese oxide particles comprising heating a mixture of manganese monoxide (MnO) particles and a lithium compound, the manganese monoxide particles having an average diameter less than about 250 nm.
Claim 11
Dependent Claim
13 words
The method of claim 8 wherein the lithium compound comprises LiNO 3 .
Claim 12
Dependent Claim
20 words
The method of claim 8 wherein the heating is performed at a temperature from about 200 to about 600° C.
Claim 13
Dependent Claim
17 words
The method of claim 8 wherein the heating is performed under an atmosphere comprising O 2 .
Claim 14
Dependent Claim
16 words
The method of claim 8 wherein the lithium manganese oxide has a cubic spinel crystal structure.
Claim 15
Independent Claim
81 words
A method of making lithium manganese oxide particles comprising heating a mixture of particles of a manganese oxide and a lithium compound, the particles of manganese oxide having an average diameter less than about 250 nm, wherein the resulting lithium manganese oxide particles have a distribution of particle sizes in which at least about 95 percent of the particles have a diameter greater than about 40 percent of the average diameter and less than about 160 percent of the average diameter.
Claim 16
Independent Claim
81 words
A method of making lithium manganese oxide particles comprising heating a mixture of particles of a manganese oxide and a lithium compound, the particles of manganese oxide having an average diameter less than about 250 nm, wherein the resulting lithium manganese oxide particles have a distribution of particle sizes in which at least about 95 percent of the particles have a diameter greater than about 40 percent of the average diameter and less than about 160 percent of the average diameter.
Claim 17
Dependent Claim
23 words
The method of claim 13 wherein the lithium manganese oxide particles have an average diameter from about 5 nm to about 100 nm.
Claim 18
Dependent Claim
21 words
The method of claim 13 wherein the heating is performed at a temperature from about 200° C. to about 500° C.
Claim 19
Dependent Claim
17 words
The method of claim 13 wherein the lithium manganese oxide particles have a cubic spinel crystal structure.
Claim 20
Dependent Claim
24 words
The method of claim 13 wherein the manganese compound comprises a manganese oxide, with the manganese in an oxidation state from +2 to +4.
Claim 21
Dependent Claim
36 words
A collection of particles comprising lithium manganese oxide, the collection of particles having an average diameter from about 5 nm to about 50 nm, the lithium manganese oxide comprising Li 2 Mn 4 O 9 .
Claim 22
Dependent Claim
36 words
A collection of particles comprising lithium manganese oxide, the collection of particles having an average diameter from about 5 nm to about 50 nm, the lithium manganese oxide comprising Li 2 Mn 4 O 9 .
Claim 23
Dependent Claim
50 words
The collection of particles of claim 18 wherein the collection of particles have a distribution of particle sizes such that at least about 95 percent of the particles have a diameter greater than about 40 percent of the average diameter and less than about 160 percent of the average diameter.
Claim 24
Dependent Claim
38 words
A collection of particles comprising lithium manganese oxide, the collection of particles having an average diameter less than about 250 nm, the lithium manganese oxide having a lattice parameter along axis a of no more than 8.23 angstroms.
Claim 25
Dependent Claim
38 words
A collection of particles comprising lithium manganese oxide, the collection of particles having an average diameter less than about 250 nm, the lithium manganese oxide having a lattice parameter along axis a of no more than 8.23 angstroms.
Claim 26
Dependent Claim
24 words
The collection of particles of claim 20 wherein the collection of particles have an average diameter from about 5 nm to about 50 nm.
Claim 27
Dependent Claim
76 words
A collection of particles comprising lithium manganese oxide, the collection of particles having an average diameter less than about 250 nm, the lithium manganese oxide comprising Li 2 Mn 4 O 9 , wherein the collection of particles have a distribution of particle sizes such that at least about 95 percent of the particles have a diameter greater than about 40 percent of the average diameter and less than about 160 percent of the average diameter.
Claim 28
Dependent Claim
76 words
A collection of particles comprising lithium manganese oxide, the collection of particles having an average diameter less than about 250 nm, the lithium manganese oxide comprising Li 2 Mn 4 O 9 , wherein the collection of particles have a distribution of particle sizes such that at least about 95 percent of the particles have a diameter greater than about 40 percent of the average diameter and less than about 160 percent of the average diameter.
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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) | 2003-10-24 | 2004-04-24 | 2004-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-10-24 | 2008-04-24 | 2008-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-10-24 | 2012-04-24 | 2012-10-24 | $7700.00 | Window Closed / Lapsed |