Non-aqueous lithium battery

• US 4,964,877 A
• Filed: 03/14/1989
• Issued: 10/23/1990
• Est. Priority Date: 01/14/1986
• Status: Expired due to Term

• Current Assignee: Greatbatch Limited (Greatbatch Incorporated)
• Original Assignee: Wilson Greatbatch Technologies, Inc.
• Inventors: Takeuchi, Esther S., Greenwood, John M., Keister, Pamela P., Muffoletto, Barry C., Mead, Ralph T., Ebel, Steven J., Zelinsky, Michael A.
• Primary Examiner(s): Kalafut, Stephen J.
• Application Number:
  US07/323,281
• Time in Patent Office: 588 Days
• Field of Search: 29/623.1, 29/623.3, 429/137, 429/94
• US Class Current: 29/623.1
• CPC Class Codes: A61N 1/378 Electrical supply
• CPC Class Codes: H01M 10/0413 Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes
• CPC Class Codes: H01M 10/0454 Cells or batteries with electrodes of only one polarity folded
• 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 4/483 for non-aqueous cells H01M4/485 takes precedence
• CPC Class Codes: H01M 4/54 of silver
• CPC Class Codes: H01M 50/103 prismatic or rectangular H01M50/109, H01M50/11 take precedence
• CPC Class Codes: H01M 50/176 for prismatic or rectangular cells H01M50/181 takes precedence
• CPC Class Codes: H01M 50/30 Arrangements for facilitating escape of gases
• CPC Class Codes: H01M 50/533 characterised by the shape of the leads or tabs
• CPC Class Codes: H01M 50/538 Connection of several leads or tabs of wound or folded electrode stacks
• CPC Class Codes: H01M 50/54 Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges
• CPC Class Codes: H01M 6/10 with wound or folded electrodes
• CPC Class Codes: H01M 6/103 Cells with electrode of only one polarity being folded or wound
• CPC Class Codes: H01M 6/16 with organic electrolyte H01M6/18 takes precedence
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product
• CPC Class Codes: Y10T 29/49108 Electric battery cell making
• CPC Class Codes: Y10T 29/4911 including sealing

Abstract

A solid cathode liquid organic electrolyte lithium cell for delivering high current pulses comprising a casing, a cathode structure in the casing comprising a plurality of plates in spaced apart relation, a lithium anode comprising a plurality of anode sections interposed between the cathode plates, a non-aqueous liquid organic electrolyte comprising the combination of a lithum salt and an organic solvent in the casing operatively contacting the anode and the cathode an electrical connection provided to the anode and an electrical connection provided to the cathode. In accordance with one aspect of the invention the cathode includes as active material Ag_x V₂ O_y where x is in the range from about 0.5 to about 2.0 and y is in the range from about 4.5 to about 6.0 which advantageously has high volumetric capacity and high rate capability with the result that the cell of the present invention delivers high capacity, shows good current pulsing behavior at various levels of discharge, and has a sloping discharge cause enabling end of life to be predicted.

Claims

1. A method of making an anode-cathode assembly for a solid cathode non-aqueous liquid electrolyte alkali metal cell for delivering high current pulses comprising the steps of:

(a) providing a cathode mix comprising cathode active material;

(b) providing a cathode conductor comprising a body portion and a lead portion;

(c) pressing said cathode mix on said conductor body portion to form a pellet;

(d) encapsulating said pellet with separator material;

(e) providing a plurality of cathode elements according to the foregoing steps;

(f) providing an elongated alkali metal anode comprising an elongated ribbon-like anode conductor, a pair of elongated ribbon-like alkali metal elements pressed together against opposite sides of said conductor to form an anode structure and separator material encapsulating said anode structure; and

(g) folding said anode along the length thereof to form a serpentine structure; and

(h) placing said plurality of cathode elements between corresponding ones of the folds of said serpentine anode structure.

2. A method according to claim 1, wherein said step of providing a cathode mix is followed by drop-wise addition of a quantity of said electrolyte to said mix prior to said step of pressing.

3. A method according to claim 1, further including the step of heat treating said pellet after said step of pressing.

4. A method of making an anode-cathode assembly for a solid non-aqueous liquid electrolyte alkali metal cell for delivering high current pulses comprising the steps of:

(a) providing an elongated ribbon-like anode conductor element;

(b) providing a pair of elongated ribbon-like alkali metal elements;

(c) pressing said alkali metal elements against said conductor element to form an elongated ribbon-like anode structure;

(d) encapsulating said anode structure with separator material;

(d) folding said anode structure at spaced intervals along the length thereof to form a serpentine structure;

(f) providing a plurality of separate cathode elements; and

(g) placing said plurality of cathode elements between corresponding ones of the folds of said serpentine anode structure.

5. A method according to claim 4 wherein said alkali metal elements are of lithium.

6. A method of making an anode-cathode assembly for a solid cathode non-aqueous liquid electrolyte alkali metal cell for delivering high current pulses comprising the steps of:

(a) providing a cathode conductor comprising a plurality of individual sections joined in end-to-end relation;

(b) providing a cathode mix comprising cathode active material and binder;

(c) pressing said cathode mix on said conductor sections to provide a corresponding plurality of individual pellets;

(d) encapsulating said pellets with separator material;

(e) providing an elongated alkali metal anode comprising an elongated ribbon-like anode conductor, a pair of elongated ribbon-like alkali metal elements pressed together against opposite sides of said conductor to form an anode structure and separator material encapsulating said anode structure; and

(f) placing said cathode and anode in flat and in overlapping condition and folding said anode and cathode one over the other to form an anode-cathode assembly.

9. A method according to claim 6, wherein said cathode and anode are placed coincident in said overlapping condition with the ends thereof in spaced relation prior to folding.

7. A method of making an anode-cathode assembly for a solid cathode non-aqueous liquid electrolyte alkali metal cell comprising the steps of:

(a) providing an elongated cathode comprising a cathode conductor comprising a plurality of individual sections joined in end-to-end relation, a corresponding plurality of individual pellets of cathode active material pressed onto said conductor section and separator material encapsulating said pellets;

(b) providing an elongated alkali metal anode comprising an elongated ribbon-like anode conductor, a pair of elongated ribbon-like alkali metal elements pressed together against opposite sides of said conductor to form an anode structure and separator material encapsulating said anode structure; and

(c) placing said cathode and anode in flat and in overlapping condition and folding said anode and cathode one over the other to form an anode-cathode assembly.

8. A method according to claim 7, wherein said cathode and anode are placed endwise in said overlapping condition and at right angles ot each other and then folded alternately one over the other to form an interwoven anode-cathode assembly.