US H452 H · Cathode including a non fluorinated linear chain polymer as the binder, method of making the cathode, and lithium electrochemical cell containing the cathode

Abstract

A cathode suitable for use in a lithium electrochemical cell is made from a ixture of active cathode material, carbon, and non fluorinated linear chain polymer by a method including the steps of (A) dissolving the non fluorinated linear chain polymer in a non polar solvent at a temperature near the melting point of the polymer, (B) adding the active cathode material and carbon and evaporating the solvent, and (C) grinding the dried mixture into a fine powder and making it into a cathode by pressing the powdered mixture onto both sides of an expanded metal screen and then cutting to the desired dimensions. The cathode can be combined with lithium as the anode and a solution of 0.8 mol dm.sup.-3 LiAlCl.sub.4 in a mixed organic solvent of 24 mass percent 4-butyrolactone in 1, 2 dimethoxyethane as the electrolyte to provide a mechanically stable, relatively inexpensive lithium electrochemical cell having good cell performance.

Claims1

Dependent claims

Method of preparing a cathode for use in a lithium electrochemical cell from a mixture of TiS.sub.2, carbon and polypropylene, said method including the steps of

(A) dissolving polypropylene at 100.degree. to 130.degree. C. in a small volume of decahydronaphthalene contained in an argon filled dry box while stirring the solution continuously during heating,
(B) removing the solution from the heat, cooling to below 100.degree. C., and quickly adding the carbon and TiS.sub.2 before the polymer solution cools completely,
(C) stirring the powdered materials and solution vigorously until the solution is absorbed and the mix becomes granular and has cooled to room temperature,
(D) drying the mixture in a vacuum oven at 120.degree. C. to 150.degree. C. for 12 hours in order to remove the decahydronaphthalene, and
(E) grinding the dried mixture into a fine powder and making into a cathode by pressing the powdered mixture onto both sides of an expanded metal screen.

2 more elements

Dependencies are inferred from the claim text.

Cathode including a non fluorinated linear chain polymer as the binder, method of making the cathode, and lithium electrochemical cell containing the cathode

Life of this patent

Cathode including a non fluorinated linear chain polymer as the binder, method of making the cathode, and lithium electrochemical cell containing the cathode

Life of this patent

Abstract

Claims1