US5326545A
Expired / Lapsed
US
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Method of making lithium battery electrode compositions
Assignee: Valence Technology Inc
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Filing: 1993-03-30
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Granted: 1994-07-05
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Expires: 2013-03-30
Abstract
Abstract Fine particles of vanadium oxide or lithiated vanadium oxide are less than 100 microns in size and on the order of 30 microns in size. Such fine particles are prepared by spray-drying a precursor mixture. Such oxide particles are also intermingled with fine particles of carbon by including carbon particles in the precursor mixture.
Inventors
- 👤 Rene Koksbang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:50
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/36; H01M4/48; H01M4/485; C; C01; C01G; C01G31/00; C01G31/02; C01P; C01P2004/00; C01P2004/60; C01P2004/61; H01M10/00; H01M10/05; H01M10/052; H01M4/13; H01M4/131; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
142 words
A method of preparing a vanadium oxide based active material composition for an electrode of an electrochemical cell, by the steps consisting essentially of: a. forming a wet mixture comprising at least one volatile constituent and an oxide of vanadium represented by the general formula V 2 O 5 ; b. atomizing the mixture of step (a) to form droplets thereof and contacting the droplets with a stream of hot gas at a temperature to evaporate such volatile constituent thereby providing fine particles of the oxide of vanadium at least a major portion of such particles represented by the general formula V 2 O 5 ; c. directing the fine particles onto a collection surface; and d. removing the fine particles from the collection surface to form a collection of powder material suitable for use in an electrode of an electrochemical cell.
Claim 2
Independent Claim
142 words
A method of preparing a vanadium oxide based active material composition for an electrode of an electrochemical cell, by the steps consisting essentially of: a. forming a wet mixture comprising at least one volatile constituent and an oxide of vanadium represented by the general formula V 2 O 5 ; b. atomizing the mixture of step (a) to form droplets thereof and contacting the droplets with a stream of hot gas at a temperature to evaporate such volatile constituent thereby providing fine particles of the oxide of vanadium at least a major portion of such particles represented by the general formula V 2 O 5 ; c. directing the fine particles onto a collection surface; and d. removing the fine particles from the collection surface to form a collection of powder material suitable for use in an electrode of an electrochemical cell.
Claim 3
Dependent Claim
28 words
The method according to claim 1, wherein the volatile constituent of step (a) is water in an amount to provide the mixture in the form of a gel.
Claim 4
Dependent Claim
31 words
The method according to claim 1, wherein the volatile constituent of step (a) is water in an amount to provide the mixture having a viscosity less than that of a gel.
Claim 5
Dependent Claim
21 words
The method according to claim 1, wherein the hot gas is air and the temperature is not less than 100° C.
Claim 6
Dependent Claim
45 words
The method according to claim 1, wherein the mixture further includes fine particles of carbon and step (b) further includes dispersing the carbon particles among the vanadium oxide particles thereby providing a powder consisting essentially of intermingled particles of the vanadium oxide and the carbon.
Claim 7
Dependent Claim
33 words
The method according to claim 5, wherein the carbon particles are larger than the vanadium oxide particles and step (b) further includes depositing the smaller vanadium oxide particles on the larger carbon particles.
Claim 8
Dependent Claim
28 words
The method according to claim 1 wherein the collection surface has an average surface temperature which is less than the temperature of the hot gas of step (b).
Claim 9
Independent Claim
160 words
A method of preparing vanadium oxide based active material composition for an electrode of an electrochemical cell, comprising: a. forming a wet mixture comprising at least one volatile constituent, lithium hydroxide (LiOH) and an oxide of vanadium represented by the general formula V 2 O 5 and reacting the LiOH with the V 2 O 5 for a time and at a temperature to provide lithium-vanadium oxide of the nominal general formula LiV 3 O 8 ; b. atomizing the mixture of step (a) to form droplets thereof and contacting the droplets with a stream of hot gas at a temperature to evaporate such volatile constituent thereby providing fine particles of the lithium-vanadium oxide having the nominal general formula LiV 3 O 8 ; c. directing the fine particles onto a collection surface; and d. removing the fine particles from the collection surface to form a collection of powder material suitable for use in an electrode of an electrochemical cell.
Claim 10
Independent Claim
160 words
A method of preparing vanadium oxide based active material composition for an electrode of an electrochemical cell, comprising: a. forming a wet mixture comprising at least one volatile constituent, lithium hydroxide (LiOH) and an oxide of vanadium represented by the general formula V 2 O 5 and reacting the LiOH with the V 2 O 5 for a time and at a temperature to provide lithium-vanadium oxide of the nominal general formula LiV 3 O 8 ; b. atomizing the mixture of step (a) to form droplets thereof and contacting the droplets with a stream of hot gas at a temperature to evaporate such volatile constituent thereby providing fine particles of the lithium-vanadium oxide having the nominal general formula LiV 3 O 8 ; c. directing the fine particles onto a collection surface; and d. removing the fine particles from the collection surface to form a collection of powder material suitable for use in an electrode of an electrochemical cell.
Claim 11
Dependent Claim
18 words
The method according to claim 8, wherein the temperature of step (a) is at least about 20° C.
Claim 12
Dependent Claim
24 words
The method according to claim 8, wherein the temperature of step (a) is in a range of about 20° C. to about 60° C.
Claim 13
Dependent Claim
32 words
The method according to claim 8, wherein the LiOH is present in an amount to provide 1 mole of Li atoms for each 1.5 moles of the V 2 O 5 .
Claim 14
Dependent Claim
28 words
The method according to claim 8, wherein the volatile constituent of step (a) is water in an amount to provide the mixture in the form of a gel.
Claim 15
Dependent Claim
31 words
The method according to claim 8, wherein the volatile constituent of step (a) is water in an amount to provide the mixture having a viscosity less than that of a gel.
Claim 16
Dependent Claim
21 words
The method according to claim 8, wherein the hot gas is air and the temperature is not less than 100° C.
Claim 17
Dependent Claim
45 words
The method according to claim 8, wherein the mixture further includes fine particles of carbon and step (b) further includes dispersing the carbon particles among the vanadium oxide particles thereby providing a powder consisting essentially of intermingled particles of the vanadium oxide and the carbon.
Claim 18
Dependent Claim
33 words
The method according to claim 15, wherein the carbon particles are larger than the vanadium oxide particles and step (b) further includes depositing the smaller vanadium oxide particles on the larger carbon particles.
Claim 19
Dependent Claim
31 words
The method according to claim 8 wherein the collection surface is at a temperature in a range selected to maintain the chemical and physical characteristics of the particles of step (b).
Claim 20
Dependent Claim
28 words
The method according to claim 8 wherein the collection surface has an average surface temperature which is less than the temperature of the hot gas of step (b).
Claim 21
Independent Claim
157 words
A method of preparing a vanadium oxide based active material composition for an electrode of an electrochemical cell, comprising: a. forming a wet mixture comprising at least one volatile constituent and an oxide of vanadium represented by the general formula V 2 O 5 ; b. atomizing the mixture of step (a) to form droplets thereof and contacting the droplets with a stream of hot gas at a temperature to evaporate such volatile constituent thereby providing fine particles of the oxide of vanadium at least a major portion of such particles represented by the general formula V 2 O 5 ; c. directing the fine particles onto a collection surface at a temperature in a range selected to maintain the chemical and physical characteristics of the particles of step (b); and d. removing the fine particles from the collection surface to form a collection of powder material suitable for use in an electrode of an electrochemical cell.
Claim 22
Independent Claim
157 words
A method of preparing a vanadium oxide based active material composition for an electrode of an electrochemical cell, comprising: a. forming a wet mixture comprising at least one volatile constituent and an oxide of vanadium represented by the general formula V 2 O 5 ; b. atomizing the mixture of step (a) to form droplets thereof and contacting the droplets with a stream of hot gas at a temperature to evaporate such volatile constituent thereby providing fine particles of the oxide of vanadium at least a major portion of such particles represented by the general formula V 2 O 5 ; c. directing the fine particles onto a collection surface at a temperature in a range selected to maintain the chemical and physical characteristics of the particles of step (b); and d. removing the fine particles from the collection surface to form a collection of powder material suitable for use in an electrode of an electrochemical cell.
Claim 23
Dependent Claim
28 words
The method according to claim 19 wherein the collection surface has an average surface temperature which is less than the temperature of the hot gas of step (b).
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1997-07-04 | 1998-01-03 | 1998-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-07-04 | 2002-01-03 | 2002-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-07-04 | 2006-01-03 | 2006-07-05 | $7700.00 | Window Closed / Lapsed |