Thin composite solid electrolyte film for lithium batteries

• US 5,360,686 A
• Filed: 08/20/1993
• Issued: 11/01/1994
• Est. Priority Date: 08/20/1993
• Status: Expired due to Fees

• Current Assignee: United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration
• Original Assignee: The United States Of America As Represented By The National Aeronautics And Space Administration
• Inventors: Nagasubramanian, Ganesan, Peled, Emmanuel, Halpert, Gerald, Attia, Alan I.
• Primary Examiner(s): Kalafut, Stephen
• Assistant Examiner(s): NUZZOLILLO, MARIA
• Application Number:
  US08/112,483
• Time in Patent Office: 438 Days
• Field of Search: 429/191, 429/192
• US Class Current: 429/312
• CPC Class Codes: H01M 4/621 Binders
• CPC Class Codes: H01M 6/181 with polymeric electrolytes
• CPC Class Codes: H01M 6/182 with halogenide as solid electrolyte

Abstract

A composite solid electrolyte film for a lithium battery comprising a dispersion of small reinforcing particles such as alumina in a binder rein such as polyethylene oxide. The particles are coated with a compatible lithium salt such as lithium iodide and the alumina particles preferably have a size below 0.5 microns.

Claims

1. A composite solid electrolyte for a lithium battery comprising a film including a dispersion of 4-20 percent by weight of reinforcing, alumina particles in a binder resin, said particles being coated with a layer of lithium salt.

2. An electrolyte according to claim 1 in which the particles have a size below 0.5 microns.

3. An electrolyte according to claim 2 in which the particles have a size from 0.01 to 0.1 microns.

4. An electrolyte according to claim 1 in which the lithium salt is present in an amount of 15-40 percent by weight.

5. A composite solid electrolyte for a lithium battery comprising a film including a dispersion of 4-20 percent by weight of inorganic reinforcing particles in a binder resin, said particles being coated with a layer of lithium halide.

6. An electrolyte according to claim 5 in which the lithium salt is lithium iodide.

7. A battery comprising:

a composite solid electrolyte film formed of a dispersion of reinforcing, alumina particles in a binder resin, said particles being coated with a layer of lithium halide;

a lithium anode adjacent a first surface of said film; and

a cathode adjacent a second surface of the film.

8. A battery according to claim 7 in which the lithium salt is lithium iodide.

9. A composite solid electrolyte for a lithium battery comprising a film including a dispersion of reinforcing particles in a polyethylene oxide binder resin, said particles being coated with a layer of lithium salt.