Nonaqueous electrochemical cell

• US 4,608,322 A
• Filed: 09/28/1984
• Issued: 08/26/1986
• Est. Priority Date: 09/29/1983
• Status: Expired due to Term

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Howard, William G., Berberick, David R.
• Primary Examiner(s): NOT, DEFINED
• Application Number:
  US06/656,061
• Time in Patent Office: 697 Days
• Field of Search: 429/101, 429/105, 429/194, 429/196, 429/191, 429/199, 429/212
• US Class Current: 429/105
• CPC Class Codes: H01M 2300/002 Inorganic electrolyte
• CPC Class Codes: H01M 2300/0025 Organic electrolyte
• CPC Class Codes: H01M 4/12 of consumable metal or alloy electrodes use of alloy compositions as active materials H01M4/38
• CPC Class Codes: H01M 50/46 Separators, membranes or diaphragms characterised by their combination with electrodes
• CPC Class Codes: H01M 6/14 Cells with non-aqueous electrolyte

Abstract

A nonaqueous cell comprising an active metal anode, such as a lithium, sodium, potassium, calcium or alloys, a liquid cathode-electrolyte comprising a solute dissolved in a solvent which, in a preferred aspect, is an oxyhalide of an element of Group V or Group VI of the Periodic Table and wherein the surface of the anode contacting the cathode-electrolyte is coated with a polymeric film having ether linkages. In a preferred practice of the present invention, the anode is coated with polyethersulfone.

Claims

1. A nonaqueous electrochemical cell comprising in operative relationship,

a. a cathode current collector:

b. an ionically conductive, liquid cathode-electrolyte solution; and

c. a active metal anode, the anode having on its surface which contacts the cathode-electrolyte a polyether film.

2. An electrochemical cell according to claim 1 wherein the cathode current collector comprises porous carbon.

3. An electrochemical cell according to claim 1 wherein the cathode-electrolyte solution comprises a solute dissolved in a liquid active cathode depolarizer of an element of Group V or Group VI of the Periodic Table.

4. An electrochemical cell according to claim 3 wherein the solute is lithium aluminum chloride and the solvent is thionyl chloride.

5. An electrochemical cell according to claim 1 wherein the active metal anode is selected from the group consisting of lithium, Group IA, IIA, or III elements of the Periodic Table of the Periodic Table or alloys thereof.

6. An electrochemical cell according to claim 1 wherein the polyether film has a thickness in the range of about 0.0001 to 0.01 inch.

7. An electrochemical cell according to claim 1 wherein the polyether film is polyethylene oxide.

8. An electrochemical cell according to claim 1 wherein the polyether film is polyethersulfone.

9. An electrochemical cell according to claim 1 wherein the polyether film is a mixture of polyethersulfone and polyethylene oxide.

10. An nonaqueous electrochemical cell comprising in operative relationship,

a. a cathode current collector:

b. an ionically conductive, liquid cathode-electrolyte solution; and

c. an active metal anode, the anode having on its surface which contacts the cathode-electrolyte a polyethersulfone film.

11. An electrochemical cell according to claim 10 wherein the cathode current collector comprises porous carbon.

12. An electrochemical cell according to claim 10 wherein the cathode-electrolyte solution comprises a solute dissolved in a liquid active cathode depolarizer of an element of Group V or Group VI of the Periodic Table.

13. An electrochemical cell according to claim 12 wherein the solute is lithium aluminum chloride and the solvent is thionyl chloride.

14. An electrochemical cell according to claim 10 wherein the active metal anode is selected from the group consisting of lithium, Groups IA, IIA, or III of the periodic table or alloys thereof.

15. An electrochemical cell according to claim 10 wherein the polyethersulfone film has a thickness in the range of about 0.0001 to 0.01 inch.

16. An electrochemical cell according to claim 10 wherein the polyethersulfone is of the structure:

##STR4## wherein R₁, R₂, R₃, R₄, R₅, R₆ , R₇ and R₈ are separately and independently hydrogen, lower alkyl and "n" has a value in the range of about 10 to 1000.

17. An electrochemical cell according to claim 10 wherein the polyethersulfone is of the structure:

##STR5## R₁ -R₈ are separately and independently hydrogen or lower alkyl and wherein "n" has a value in the range of about 10 to 1000.

18. An electrochemical cell according to claim 17 wherein R₁ -R₈ are all hydrogen.

19. A nonaqueous electrochemical cell comprising in operative relationship,

a. A cathode current collector;

b. an ionically conductive, liquid cathode-electrolyte solution comprising a solute dissolved in a liquid active cathode depolarizer of an element of Group V or Group VI of the Periodic Table; and

c. an active metal anode, the anode having on its surface which contacts the cathode-electrolyte an adherence, ionically permeable polyethersulfone film of the structure;

##STR6## wherein R₁ -R₈ are separately and independently hydrogen or lower alkyl, and "n" has a value in the range of about 10 to 1,000.

20. An electrochemical cell according to claim 19 wherein the active cathode depolarizer is thionyl chloride.

21. An electrochemical cell according to claim 20 wherein the active metal anode is lithium.

22. An electrochemical cell according to claim 20 wherein the solute is LiAlCl₄.

23. An electrochemical cell according to claim 20 wherein the polyethersulfone film has a thickness in the range of about 0.0001 to 0.01 inch.