Lithium batteries with organic slurry cathodes

• US 4,466,470 A
• Filed: 01/20/1982
• Issued: 08/21/1984
• Est. Priority Date: 01/20/1982
• 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.
• Primary Examiner(s): Bell, Jr., Houston S.
• Application Number:
  US06/341,195
• Time in Patent Office: 944 Days
• Field of Search: 141/1.1, 141/32, 141/33, 252/506, 252/509, 252/512, 252/518, 252/521, 429/224, 429/194, 429/197, 429/152, 429/232
• US Class Current: 141/1.1
• CPC Class Codes: H01M 4/08 Processes of manufacture
• CPC Class Codes: H01M 6/16 with organic electrolyte H01M6/18 takes precedence
• CPC Class Codes: H01M 6/48 with bipolar electrodes

Abstract

Electrical cells and batteries having lithium anodes and cathodes comprising an organic slurry of MnO₂ and carbon particles in an organic solvent in contact with a conductive plastic current collector, and a method of making the cathodes comprising the steps of heating MnO₂ to remove absorbed and adsorbed water and water of crystallization, cooling the dehydrated MnO₂, dispersing the cooled and dehydrated MnO₂ in an anhydrous solvent to form a slurry, depositing the slurry in discrete cathode patches on cell component substrates, and sealing the slurry patches into cells having substantially gas impervious cell enveloping boundaries.

Claims

1. The method of making a cathode, comprising the steps of dispersing dewatered MnO₂ and carbon black in a substantially anhydrous solution of a lithium salt in an organic solvent to form a slurry, said slurry being free of any binder material, and depositing a quantity of said slurry on the surface of a flat electrolyte permeable separator.

2. The method of making a lithium battery comprising the steps of dewatering Mno₂ by heat treatment, mixing said dewatered Mno₂ and carbon black with a substantially anhydrous solution of a lithium salt in an organic solvent to form a slurry, said slurry being free of any binder material, placing a thin flat electrolyte permeable separator in contact with a thin flat sheet of lithium, depositing a quantity of said slurry on said separator on the side of said separator opposite said lithium sheet, and encapsulating said slurry deposit, said separator and said lithium sheet in a solvent impermeable enclosure.