Method for making electrochemical device

• US 5,455,999 A
• Filed: 02/02/1995
• Issued: 10/10/1995
• Est. Priority Date: 03/09/1994
• Status: Expired due to Term

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Owens, Boone B., Weiss, Douglas J.
• Primary Examiner(s): Skapars, Anthony
• Application Number:
  US08/382,549
• Time in Patent Office: 250 Days
• Field of Search: 29/623.1, 29/623.3, 29/623.5
• US Class Current: 29/623.1
• CPC Class Codes: H01G 11/08 Structural combinations, e.g. assembly or connection, of hybrid or EDL capacitors with other electric components, at least one hybrid or EDL capacitor being the main component
• CPC Class Codes: H01G 11/32 Carbon-based
• CPC Class Codes: H01G 11/56 Solid electrolytes, e.g. gels; Additives therein
• CPC Class Codes: H01M 10/4264 with capacitors
• CPC Class Codes: H01M 16/00 Structural combinations of different types of electrochemical generators
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02E 60/13 Energy storage using capacitors
• CPC Class Codes: Y10T 29/49108 Electric battery cell making
• CPC Class Codes: Y10T 29/49115 including coating or impregnating

Abstract

An electrochemical device for production of electrical energy including a case, a primary Faradaic component in the case comprising an active metal anode and a cathode material, an electrochemical capacitor component in the case comprising first and second layers of conductive carbon separated by an electrolyte layer, and means for operatively combining the capacitor component and the primary Faradaic component to charge the capacitor component from the Faradaic component and to maintain the capacitor component in a charged state.

Claims

1. A method for making an electrochemical device comprising the steps of:

(a) admixing electrically conductive carbon with a non-aqueous liquid solvent, a powdered active metal anode material, a soluble salt, and a gel-former;

(b) sheeting the anode mixture into a thin electrode layer;

(c) applying to a first side of the first electrode layer a metal current collector;

(d) applying to a second side of the first electrode a first side of an electrolyte layer;

(e) admixing an electrically conductive carbon with a non-aqueous liquid solvent, a powdered active cathode material, a soluble salt and a gel-former;

(f) sheeting the cathode mixture into a second electrode layer; and

(g) applying the second electrode layer onto a second side of the electrolyte layer.

2. A method according to claim 1 wherein conductive carbon comprises at least 10 wt % of the first and second electrode layers.

3. A method according to claim 1 wherein the solvent is selected from the group consisting:

of ethylene carbonate, propylene carbonate, 2-methyl tetrahydrofuran, sulfolane, triglyme and mixtures thereof.

4. A method according to claim 1 wherein the soluble salt is selected from the group consisting of LiClO₄, LiAsF₆, LiPF₆, LiCF₆ SO₃, LiN(CF₃ SO₂)₂ and LiBF₄.

5. A method according to claim 2 wherein the gel-former is selected from the group consisting of polyacrylonitrile, polyvinylpryrrolidone, polytetraethylene glycol diacrylate, and mixtures thereof.