Lithium secondary battery
AssigneesSanyo Electric Co., Ltd., Ube Industries, Ltd.
InventorsMasatoshi Takahashi, Zensaku Yasutake, Koji Abe, Akira Ueki, Toshikazu Hamamoto
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Abstract
A lithium secondary battery including an electrode assembly composed of positive and negative electrode plates wound up spirally with a separator and disposed in a cell casing filled with electrolyte containing lithium salt dissolved in organic solvent wherein the cell casing is provided with a current interrupt device for cutting off a charge current of the battery when an internal gas pressure of the battery exceeds a predetermined value, and wherein the organic solvent contains aklylbenzene derivative or cycloalkylbenzene derivative having tertiary carbon adjacent a phenyl group.
Claims20
A lithium secondary battery including an electrode assembly composed of positive and negative electrode plates wound up spirally with a separator and disposed in a cell casing filled with electrolyte containing lithium salt dissolved in organic solvent,
- wherein said cell casing is provided with a current interrupt device for cutting off charge current of the battery when its internal gas pressure rises excessively, and
- wherein said organic solvent contains a cycloalkylbenzene derivative having tertiary carbon adjacent a phenyl group.
In a lithium battery having separated positive and negative electrodes disposed in a closed cell casing with an electrolyte containing lithium salt dissolved in organic solvent and having an internal current interrupt switch automatically operated by gas pressure inside the casing, the improvement comprising:
- said organic solvent containing a cycloalkylbenzene derivative having tertiary carbon adjacent a phenyl group so as to more quickly build up internal casing gas pressure and operate said current cut-off switch after the battery is fully charged.
Dependencies are inferred from the claim text.