US5674644A
Expired / Lapsed
US
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Manganese oxide electrode and method
Assignee: Motors Liquidation Co
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Filing: 1996-06-14
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Granted: 1997-10-07
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Expires: 2016-06-14
Abstract
Abstract A secondary lithium ion cell having an anode, a cathode and a nonaqueous electrolyte wherein the cathode comprises sub-micron-size amorphous, microporous, lithium-intercalateable manganese oxide having an internal surface area greater than about 100 m2/g. The cathode may include an electrically conductive lithium-intercalateable polymer binder. A sol-gel process for making the amorphous quatravalent manganese oxide is disclosed.
Inventors
- 👤 Gholam-Abbas Nazri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:42
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/13; H01M4/131; C; C01; C01G; C01G45/00; C01G45/02; H01M4/36; H01M4/48; H01M4/50; H01M4/505; H01M4/60; H01M4/602; H01M4/606; H01M4/608; H01M4/62; H01M4/621; H01M4/622; H01M4/64; H01M4/66; H01M4/665; H01M4/667; C01P; C01P2002/00; C01P2002/02; C01P2002/70; C01P2002/72; C01P2004/00; C01P2004/01; C01P2004/03; C01P2004/60; C01P2004/61; C01P2006/00; C01P2006/12; C01P2006/40; H01M10/00; H01M10/05; H01M10/052; H01M2300/00; H01M2300/0017; H01M2300/0025; H01M4/139; H01M4/1391; H01M4/661; H01M4/663; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
145 words
A method of making an amorphous, microporous, quatravalent manganese oxide electrode for a secondary lithium-ion battery said manganese oxide having an internal surface area of at least about 100 m 2 /g comprising the steps of: a. dissolving a first manganese compound having a manganese oxidation state greater than 4 in a first polar solvent to provide a first solution; b. dissolving a second manganese compound having a manganese oxidation state less than 4 in a second polar solvent to provide a second solution; c. adding said second solution to, and rapidly dispersing it throughout, said first solution until substantially all of said first compound is reduced and forms a gel containing said manganese oxide; d. drying said gel to recover said manganese oxide as submicron-size particles; e. mixing said manganese oxide with a binder; and f. applying the oxide-binder mixture to a conductive substrate.
Claim 2
Independent Claim
145 words
A method of making an amorphous, microporous, quatravalent manganese oxide electrode for a secondary lithium-ion battery said manganese oxide having an internal surface area of at least about 100 m 2 /g comprising the steps of: a. dissolving a first manganese compound having a manganese oxidation state greater than 4 in a first polar solvent to provide a first solution; b. dissolving a second manganese compound having a manganese oxidation state less than 4 in a second polar solvent to provide a second solution; c. adding said second solution to, and rapidly dispersing it throughout, said first solution until substantially all of said first compound is reduced and forms a gel containing said manganese oxide; d. drying said gel to recover said manganese oxide as submicron-size particles; e. mixing said manganese oxide with a binder; and f. applying the oxide-binder mixture to a conductive substrate.
Claim 3
Dependent Claim
22 words
A method according to claim 1 wherein said first manganese compound contains hepta-valent manganese and said second manganese compound contains divalent manganese.
Claim 4
Dependent Claim
15 words
A method according to claim 2 wherein said first and second solvents are the same.
Claim 5
Dependent Claim
11 words
A method according to claim 3 wherein said solvents are water.
Claim 6
Dependent Claim
16 words
A method according to claim 4 wherein said first solution has a pH less than 7.
Claim 7
Dependent Claim
15 words
A method according to claim 5 wherein said first manganese compound comprises a permanganate ion.
Claim 8
Dependent Claim
15 words
A method according to claim 6 wherein said second manganese compound comprises a manganous salt.
Claim 9
Dependent Claim
13 words
A method according to claim 7 wherein said manganous salt comprises manganous nitrate.
Claim 10
Dependent Claim
13 words
A method according to claim 7 wherein said pH is less than 5.
Claim 11
Dependent Claim
14 words
A method according to claim 9 wherein said pH is less than about 2.
Claim 12
Dependent Claim
35 words
A method according to claim 7 wherein said first solution has a temperature of at least about 80° C. during said dispersing and said particles have an average particle size less than about 0.3 microns.
Claim 13
Dependent Claim
22 words
A method according to claim 7 wherein said second solution is added to said first solution while vigorously agitating said first solution.
Claim 14
Dependent Claim
22 words
A method according to claim 12 wherein droplets of said second solution are sequentially added to said first solution during said agitating.
Claim 15
Dependent Claim
15 words
A method according to claim 1 wherein said drying is effected by heating said gel.
Claim 16
Dependent Claim
23 words
A method according to claim 14 wherein said gel is filtered to remove some of said water from said gel before said heating.
Claim 17
Dependent Claim
24 words
A method according to claim 6 wherein the concentration of said first manganese compound in said first solution is less than about 0.3 molar.
Claim 18
Dependent Claim
32 words
A method according to claim 16 wherein the concentration of said second manganese compound in said second solution is less than the concentration of said first manganese compound in said first solution.
Claim 19
Dependent Claim
38 words
A method according to claim 1 wherein said second solution is added to said first solution in increments the size of which increments are inversely proportional to the concentration of said second manganese compound in said second solution.
Claim 20
Dependent Claim
50 words
A method according to claim 1 including the step of mixing said second solution with a liquid precursor of a solid polymer, said precursor having at least one repeating unit, and polymerizing said precursor in situ with said first manganese compound to form solid polymer distributed throughout said manganese oxide.
Claim 21
Dependent Claim
37 words
A method according to claim 19 wherein said polymer is selected from the group consisting of polyaniline, polypyrrole, polythiophene and derivatives thereof, and said precursor is selected from the group consisting of a monomer and short-chain polymer.
Claim 22
Dependent Claim
11 words
A method according to claim 20 wherein said polymer is polyaniline.
Claim 23
Dependent Claim
13 words
A method according to claim 21 wherein said liquid precursor comprises monomeric aniline.
Claim 24
Dependent Claim
32 words
A method according to claim 21 wherein the concentration of said precursor is about 5 percent to about 30 percent of the concentration of said second manganese compound on a molar basis.
Claim 25
Independent Claim
127 words
A method of making an amorphous, microporous, quatravalent manganese oxide electrode material for a secondary lithium-ion battery, said material having an internal surface area greater than about 100 m 2 /g comprising the steps of: a. dissolving a first manganese compound having a manganese oxidation state greater than 4 in a first polar solvent to provide a first solution; b. dissolving a second manganese compound having a manganese oxidation state less than 4 in a second polar solvent to provide a second solution; c. adding said second solution to and rapidly dispersing it throughout said first solution until substantially all of said first compound is reduced and forms a gel containing said manganese oxide; and d. drying said gel to recover said manganese oxide as submicron-size particles.
Claim 26
Independent Claim
127 words
A method of making an amorphous, microporous, quatravalent manganese oxide electrode material for a secondary lithium-ion battery, said material having an internal surface area greater than about 100 m 2 /g comprising the steps of: a. dissolving a first manganese compound having a manganese oxidation state greater than 4 in a first polar solvent to provide a first solution; b. dissolving a second manganese compound having a manganese oxidation state less than 4 in a second polar solvent to provide a second solution; c. adding said second solution to and rapidly dispersing it throughout said first solution until substantially all of said first compound is reduced and forms a gel containing said manganese oxide; and d. drying said gel to recover said manganese oxide as submicron-size particles.
References Cited (Backward Citations)
US4507371A
Cited
US4590059A
Cited
US4585718A
Cited
US4588575A
Cited
US5169736A
Cited
US5196279A
Cited
US5156934A
Cited
US5135732A
Cited
US5192629A
Cited
US5482796A
Cited
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