US5807646A
Expired / Lapsed
US
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Spinel type lithium-mangenese oxide material, process for preparing the same and use thereof
Assignee: Tosoh Corp
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Filing: 1996-02-15
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Granted: 1998-09-15
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Expires: 2016-02-15
Abstract
Abstract A novel lithium-manganese oxide composition suitable for use in lithium secondary batteries as an active material for positive electrodes, said oxide having a spinel type crystal structure, an Li:Mn molar ratio of 0.9-1.10:2.00, a mean Mn oxidation number of 3.40-3.60 valencies, and a BET specific surface area of at least 1 m2/g, substantially all the primary particles of said oxide being less than 1 mu m; a process for preparing such an oxide and a lithium secondary battery containing such an oxide are also disclosed.
Inventors
- 👤 Eiichi Iwata
- 👤 Ken-ichi Takahashi
- 👤 Setsuo Yoshida
- 👤 Masaki Okada
- 👤 Masanori Sawano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:41
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; C01G45/1292; H01M10/00; H01M10/05; H01M10/052; C01P; C01P2002/00; C01P2002/30; C01P2002/32; C01P2002/70; C01P2002/77; C01P2004/00; C01P2004/60; C01P2004/62; C01P2006/00; C01P2006/11; C01P2006/12; C01P2006/40; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
96 words
A lithium-manganese oxide comprising Li, Mn and O which is characterized by having a spinel type crystal structure, an Li to Mn molar ratio of from 0.90:2.00 to 1.10:2.00, a mean oxidation number of Mn of from 3.40 to 3.60 valencies and a BET specific surface area of at least 1 m 2 /g and is further characterized in that substantially all the primary particles thereof are less than 1 μm in size, said crystal structure being of a cubic system spinel structure having, as a lattice constant, a length of axis a of 8.240-8.245 angstroms.
Claim 2
Dependent Claim
96 words
A lithium-manganese oxide comprising Li, Mn and O which is characterized by having a spinel type crystal structure, an Li to Mn molar ratio of from 0.90:2.00 to 1.10:2.00, a mean oxidation number of Mn of from 3.40 to 3.60 valencies and a BET specific surface area of at least 1 m 2 /g and is further characterized in that substantially all the primary particles thereof are less than 1 μm in size, said crystal structure being of a cubic system spinel structure having, as a lattice constant, a length of axis a of 8.240-8.245 angstroms.
Claim 3
Dependent Claim
23 words
A lithium-manganese oxide as claimed in claim 1 in which said primary particles form agglomerates having a mean particle size of 1-30 μm.
Claim 4
Dependent Claim
25 words
A lithium-manganese oxide as claimed in claim 1 in which a crystallite in said cubic system spinel structure has a crystalline size of 400-700 angstroms.
Claim 5
Dependent Claim
21 words
A lithium-manganese oxide as claimed in claim 1 which has a tapping density of not less than 1.7 g/cm 3 .
Claim 6
Dependent Claim
90 words
A process for preparing the lithium-manganese oxide as claimed in any one of claims 1, 2, 3 or 4 which comprises mixing a manganese compound and a lithium compound together and thermally treating the mixture to form said lithium-manganese oxide or oxides, said manganese compound being at least one Mn--O or Mn--O--H compound selected from the group consisting of; manganese oxides, MnOx, wherein x is not greater than 1.5; manganese oxide hydrates, (MnOx.nH 2 O), wherein x is not greater than 1.5; manganese hydroxides, Mn(OH)x; and manganese oxy oxide, MnOOH.
Claim 7
Dependent Claim
19 words
A process according to claim 5 in which the selected manganese compound is of a spinel type crystal structure.
Claim 8
Dependent Claim
28 words
A process according to claim 5 in which the selected manganese compound is one having a spinel type structure that has been prepared by oxidizing a manganese hydroxide.
Claim 9
Dependent Claim
31 words
A process according to claim 5 in which the selected manganese compound has a spinel type structure and has a BET specific surface area of at least 5 m 2 /g.
Claim 10
Dependent Claim
28 words
A process according to claim 5 in which the lithium compound is at least one member selected from the group consisting of lithium hydroxide, nitrate, chloride and carbonate.
Claim 11
Dependent Claim
25 words
A process according to claim 5 in which the thermal treatment temperature is not less than 500° C. but is not greater than 850° C.
Claim 12
Dependent Claim
53 words
A process according to claim 5 in which said mixture is subjected at least once to a preliminary thermal treatment at a temperature of not less than 200° C. but less than 500° C. and subsequently subjected to said thermal treatment at not less than 500° C. but not greater than 850° C.
Claim 13
Dependent Claim
59 words
A process according to claim 5 in which said mixture is subjected to at least once to a preliminary thermal treatment at a temperature of not less than 200° C. but less than 500° C., then to the mixing procedure again, and thereafter to said thermal treatment at not less than 500° C. but not greater than 850° C.
Claim 14
Dependent Claim
32 words
A process according to claim 5 in which after said manganese compound and lithium compound are mixed together, the resulting mixture is molded under pressure and then subjected to said thermal treatment.
Claim 15
Dependent Claim
34 words
A lithium secondary battery in which the lithium-manganese oxide as claimed in any one of claims 1, 2, 3 or 4 is employed as an active material for the positive electrode in said battery.
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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) | 2001-09-14 | 2002-03-16 | 2002-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-09-14 | 2006-03-16 | 2006-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-09-14 | 2010-03-16 | 2010-09-15 | $7700.00 | Window Closed / Lapsed |