Additive for electrode

• US 5,419,985 A
• Filed: 05/24/1994
• Issued: 05/30/1995
• Est. Priority Date: 03/30/1993
• Status: Expired due to Term

• Current Assignee: Valence Technology Incorporated (Lithium Werks B.V.)
• Original Assignee: Valence Technology Incorporated (Lithium Werks B.V.)
• Inventors: Koksbang, Rene
• Primary Examiner(s): GORGOS, KATHRYN L
• Application Number:
  US08/248,640
• Time in Patent Office: 371 Days
• Field of Search: 204/291, 252/500, 252/506, 429/213, 429/212, 429/42
• US Class Current: 429/212
• CPC Class Codes: H01M 10/0567 characterised by the additives
• CPC Class Codes: H01M 4/62 Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

The invention provides an alkoxyl additive for use in electrodes or precursor pastes of such electrodes, where such additive is hydrolyzed to thereby take-up or remove any water in the precursor paste or electrode.

Claims

1. An electrode composition or precursor paste thereof which comprises an active material and one or more alkoxyl compounds which hydrolyze and selected from the group consisting of ketals, acetals orthoesters, methoxyethers and polymethoxyethers.

2. The electrode composition according to claim 1, wherein the alkoxyl compounds are present in an amount less than about 1% by weight of the electrode composition or precursor thereof.

3. An electrode composition or precursor paste thereof which comprises an active material and an alkoxyl compound which hydrolyzes and is represented by the general formula (CH₃ O)₃ CH.

4. The electrode composition according to claim 3, wherein the alkoxyl compounds are present in an amount less than about 1% by weight of the electrode composition or precursor thereof.

5. An electrode composition or precursor paste thereof which comprises an active material and at least one reaction product of water and an alkoxyl compound which hydrolyzes and is selected from the group consisting of ketals, acetals, orthoesters, methoxyethers and polymethoxyethers;

where one or more of said at least one reaction product is selected from the group consisting of alcohols, carbonyls and mixtures thereof.

6. The electrode composition or precursor paste thereof according to claim 5, wherein the alkoxyl compounds are present in an amount less than about 1% by weight of the electrode composition or precursor thereof.

7. An electrode composition or precursor paste thereof which comprises an active material and at least one reaction product of water and an alkoxyl compound which hydrolyzes and is represented by the general formula (CH₃ O)₃ CH where one or more of said at least one reaction product is selected from the group consisting of alcohols, carbonyls and mixture thereof.

8. The electrode composition or precursor paste thereof according to claim 7, wherein the alkoxyl compounds are present in an amount less than about 1% by weight of the electrode composition or precursor thereof.

9. The electrode composition according to claim 7, wherein said alcohol is CH₃ OH and said carbonyl is HCOOCH₃.

10. A cathode which is used for an electrochemical cell, said cathode comprising an electrode composition or recursor paste thereof which comprises an active material and one or more alkoxy compounds which hydrolyze and selected from the group consisting of ketals, acetals, orthoesters, methoxyethers and polymethoxyethers.

11. A cathode which is used for an electrochemical cell, said cathode comprising an electrode composition or precursor paste thereof which comprises an active material and an alkoxyl compound which hydrolyzes and is represented by the general formula (CH₃ O)₃ CH.

12. A cathode which is used for an electrochemical cell, said cathode comprising an electrode composition or precursor paste thereof which comprises an active material and one or more reaction products of water and an alkoxy compound which hydrolyzes and is selected from the group consisting of ketals, acetals, orthoesters, methoxyethers, and polymethoxyethers;

where at least one of said one or more reaction products is selected from the group consisting of alcohols, carbonyls, and mixtures thereof.

13. A cathode which is used for an electrochemical cell, said cathode comprising an electrode composition or precursor paste thereof which comprises an active material and one or more reaction products of water and a alkoxyl compound which hydrolyzes and is represented by the general formula (CH₃ O)₃ CH where at east one of said one or more reaction products is selected from the group consisting of alcohols, carbonyls, and mixtures thereof.

14. The electrode composition according to claim 13 wherein said alcohol is CH₃ OH and said carbonyl is HCOOCH₃.

15. An electrode composition or precursor paste thereof which comprises an active material and one or more alkoxyl compounds which hydrolyze and selected from the group consisting of ketals, acetals orthoesters, methoxyethers and polymethoxyethers;

wherein each of the alkoxyl compounds has the general formula (CH₃ O)_n CR'"'"'_p where n is 1, 2 or 3, p is 1, 2 or 3, and where R'"'"' represents hydrogen or an alkyl.

16. The electrode composition or precursor paste thereof of claim 15 wherein when n is 1, p is 3;

when n is 2, p is 2; and

when n is 3, p is 1.

17. An electrode composition or precursor paste thereof which comprises an active material and at least one reaction product of water and an alkoxyl compound which hydrolyzes and is selected from the group consisting of ketals, acetals, orthoesters, methoxyethers and polymethoxyethers;

where said at least one reaction product is selected from the group consisting of alcohols, carbonyls and mixtures thereof; and

wherein said alkoxyl compound has the general formula (CH₃ O)_n CR'"'"'_p, where n is 1, 2 or 3, p is 1, 2 or 3, and R'"'"' represents hydrogen or an alkyl.

18. The electrode composition or precursor paste thereof of claim 17 wherein when n is 1, p is 3;

when n is 2, p is 2; and

when n is 3, p is 1.