Lithium batteries

• US 4,977,046 A
• Filed: 04/26/1982
• Issued: 12/11/1990
• Est. Priority Date: 04/26/1982
• Status: Expired due to Fees

• Current Assignee: Polaroid Corporation (PLR IP Holdings LLC)
• Original Assignee: Polaroid Corporation (PLR IP Holdings LLC)
• Inventors: Bruder, Alan H., Bleszinski, Walter Jr.
• Primary Examiner(s): Andrews, Melvyn J.
• Application Number:
  US06/372,158
• Time in Patent Office: 3,151 Days
• Field of Search: 429/194.4, 429/218, 429/224, 428/207
• US Class Current: 429/224
• CPC Class Codes: H01M 4/64 Carriers or collectors
• CPC Class Codes: H01M 6/48 with bipolar electrodes

Abstract

Electrical cells and batteries comprising cathodes formed as slurries of MnO₂ and carbon in an organic solution of electrolyte in contact with a copper substrate, and sheet lithium anodes adhered to either a conductive plastic or a roughened copper substrate.

Claims

1. A battery comprising a cathode slurry of manganese dioxide and carbon in a solution of a lithium salt in an organic solvent in contact with a copper substrate, and a lithium anode, said battery having an OCV below the value at which the copper substrate will be oxidized by the manganese dioxide in the presence of the lithium.

2. A laminar battery, comprising a thin flat sheet of metal, a nodular layer of copper covering one surface of said metal sheet, a cathode slurry deposit of MnO₂ and carbon in a solution of a lithium salt in an organic solvent on and in intimate contact with a central region of said nodular copper layer, a separator extending over said cathode slurry deposit, a lithium anode in contact with a central region of said separator on a side of said separator opposite said cathode slurry deposit, and means forming a sealed compartment about said anode, said cathode slurry deposit, and said separator, said battery having an OCV below the value at which the copper will be oxidized by the manganese dioxide in the presence of the lithium.

3. A laminar battery, comprising a first thin sheet of metal foil having a nodulated copper surface formed on one side thereof, a deposit of a slurry of MnO₂ and carbon in a solution of a lithium salt in an organic solvent on a central region of said nodular surface, a separator over and in contact with said slurry deposit, a lithium foil anode in contact with said separator on a side of said separator opposite said slurry deposit, said anode being laminated to a central region of a nodular copper surface formed on a second thin sheet of metal foil confronting said first sheet, and a thermoplastic frame between and laminated to said first and second sheets around the peripheries thereof surrounding said anode, said cathode slurry deposit, and said separator, said battery having an OCV below the value at which the copper will be oxidized by the manganese dioxide in the presence of the lithium.

4. A multicell battery comprising cells each having a lithium anode and a MnO₂ cathode spaced by a separator and communicating electrochemically through a solution of a lithium salt in an organic solvent, in which the cells are electrochemically isolated and electronically connected together through metal intercell connectors each having opposed nodular copper surfaces in contact with an anode and a cathode of different adjacent cells, said battery having an OCV below the value at which the copper will be oxidized by the manganese dioxide in the presence of the lithium.

5. A laminar battery, comprising a thin flat sheet of metal, a nodular layer of copper covering one surface of said metal sheet, a cathode slurry deposit of MnO₂ and carbon in a solution of a lithium salt in an organic solvent on and in intimate contact with a central region of said nodular copper layer, a separator extending over said cathode slurry deposit, a lithium anode in contact with a central region of said separator on a side of said separator opposite said cathode slurry deposit, and means forming a sealed compartment about said anode, said cathode slurry deposit, and said separator, said anode comprising a sheet of lithium foil laminated to and permeating the interstices of a central region of the surface of a substrate of nodulated copper foil, said battery having an OCV below the value at which the copper will be oxidized by the manganese dioxide in the presence of the lithium.

6. The battery of claim 5, in which said sealing means comprises a closed loop of thermoplastic material surrounding said anode, said cathode slurry deposit, and said separator and having opposed surfaces in which the peripheries of the nodulated surfaces of said metal sheet and said copper foil substrate are embedded.

7. A multicell battery comprising cells each having a lithium anode and a MnO₂ cathode spaced by a separator and communicating electrochemically through a solution of a lithium salt in an organic solvent, in which the cells are electrochemically isolated and electronically connected together through metal intercell connectors each having nodular copper surfaces, one of said surfaces being in contact with an anode and the other of said surfaces being in contact with a cathode of different adjacent cells, said intercell connectors having peripheries extending beyond the borders of said anodes and said cathodes and being sealed together through intermediate closed loops of thermoplastic material, said battery having an OCV below the value at which the copper will be oxidized by the manganese dioxide in the presence of the lithium.

8. A laminar battery, comprising a thin flat sheet of metal having at least one external copper surface, a cathode slurry deposit of MnO₂ and carbon in a solution of a lithium salt in an organic solvent on and in intimate contact with a central region of said copper surface, a separator extending over said cathode slurry deposit, a lithium anode in contact with a central region of said separator on a side of said separator opposite said cathode slurry deposit, and means forming a sealed compartment about said anode, said cathode slurry deposit, and said separator, said battery having been electrically drained promptly after electrochemical assembly to an OCV below the value at which said copper surface will be oxidized by said MnO₂ in the presence of lithium.

9. A laminar battery, comprising a first thin sheet of metal foil having at least one external copper surface, a deposit of a slurry of MnO₂ and carbon in a solution of a lithium salt in an organic solvent on a central region of said copper surface, a separator over and in contact with said slurry deposit, a lithium foil anode in contact with said separator on a side of said separator opposite said slurry deposit, said anode being laminated to a central region of a nodular copper surface formed on a second thin sheet of metal foil confronting said first sheet, and a thermoplastic frame between and laminated to said first and second sheets around the peripheries thereof surrounding said anode, said cathode slurry deposit, and said separator, in which said battery has been electrically drained to an OCV below the value at which copper will be oxidized by MnO₂ in the presence of lithium before any substantial oxidation of copper has occurred.