US 2001/0055719 A1 · CELL

Abstract

A lithium cell, having positive and negative electrodes capable of occluding and releasing lithium and a non-aqueous electrolyte. The cell of the present invention includes a positive electrode, a negative electrode and a gelated electrolyte composed of a polyacrylonitrile containing high molecular material, a γ-caprolactone containing non-aqueous solvent and an electrolyte salt mainly comprised of LiPF6, with the content of γ-caprolactone in the gelated electrolyte being 30 mol % or less. With the gelated electrolyte composed of the polyacrylonitrile containing high molecular material, non-aqueous solvent and the electrolyte salt mainly composed of LiPF6, a carbide film is formed on the electrode surface, on contact with the flame, as a result of the carbonization of the high molecular material and the carbonization accelerating operation of LiPF6. This carbide film inhibits inflammation for realizing superior combustion retardant properties.

Claims24

Dependent claims

A cell comprising:

a positive electrode;
a negative electrode;
a gelated electrolyte composed of a high molecular material containing polyacrylonitrile and having solubility parameter of 8 to 15 (cal/cm2)½, a mixed solvent and an electrolyte salt mainly composed of LiPF6, said mixed solvent being a mixture of ethylene carbonate, propylene carbonate and a third non-aqueous solvent which is at least one selected from the group consisting of dimethyl carbonate, ethyl methyl carbonate, methyl propionate and ethyl propionate.

Dependencies are inferred from the claim text.

Cell

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Cell

Life of this patent

Abstract

Claims24