Acidity reduction of adhesion promoter layer and electrolytic cells produced therefrom

• US 5,399,447 A
• Filed: 12/06/1993
• Issued: 03/21/1995
• Est. Priority Date: 12/06/1993
• Status: Expired due to Term

• Current Assignee: Valence Technology Incorporated (Lithium Werks B.V.)
• Original Assignee: Valence Technology Incorporated (Lithium Werks B.V.)
• Inventors: Golovin, M. Neal, Moulton, Russell, Chaloner-Gill, Benjamin
• Primary Examiner(s): Skapars, Anthony
• Application Number:
  US08/163,205
• Time in Patent Office: 470 Days
• Field of Search: 429/191, 429/192, 429/194, 429/217
• US Class Current: 429/304
• CPC Class Codes: H01M 10/05 Accumulators with non-aqueous electrolyte H01M10/39 takes precedence
• CPC Class Codes: H01M 4/02 Electrodes composed of, or comprising, active material
• CPC Class Codes: H01M 4/66 Selection of materials
• CPC Class Codes: H01M 4/668 Composites of electroconductive material and synthetic resins
• CPC Class Codes: H01M 6/181 with polymeric electrolytes
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

This invention is directed to an adhesion promoter layer promoter layer containing a binder and a conducting material having a reduced acidity, as well as electrolytic cells prepared with such adhesion promoter layers.

Claims

1. An electrolytic cell which comprises:

an anode containing a compatible anodic material;

a cathode containing a compatible cathodic material and adhered to an adhesion promoter layer comprising polyacrylic acid, a conducting material, and a basic lithium compound; and

interposed between said anode and said cathode a solid, solvent-containing electrolyte.

2. The electrolytic cell of claim 1, wherein the anode has a thickness of from about 10 to about 100 microns.

3. The electrolytic cell of claim 1, wherein the cathode has a thickness of from about 20 to about 90 microns.

4. The electrolytic cell of claim 1, wherein the electrolyte has a thickness of from about 20 to about 60 microns.

5. The electrolytic cell of claim 1, wherein the adhesion promoter layer has a thickness of from about 1 to about 10 microns.

6. The electrolytic cell of claim 1, wherein the basic lithium compound is lithium hydroxide or lithium carbonate.

7. The electrolytic cell of claim 1, wherein the conducting material is carbon, a conducting polymer or metal shavings.

8. The adhesion promoter layer of claim 1, wherein the basic lithium compound is a lithium salt of a weak acid having an acid dissociation constant of less than about 1×

10^-5.

9. The electrolytic cell of claim 1, wherein the basic lithium compound is lithium carbonate, lithium acetate, lithium propionate, lithium tartrate, lithium benzoate or lithium borate.

10. The electrolytic cell of claim 1, having from about 0.05 to about 0.5 equivalence of the basic lithium compound per mole of polyacrylic acid, based on the total weight of the adhesion promoter layer.