Lithium secondary battery

Application Number: 00109178
Application Date: 2000.06.14
Publication Number: 1279520
Publication Date: 2001.01.10
Priority Information: 1999/6/30 JP 185554/99
International: H01M10/40
Applicant(s) Name: Sanyo Electric Co., Ltd.
Inventor(s) Name: Takahashi Masatoshi;Yasutake Zesaku;Abe Koji
Patent Agency Code: 11021
Patent Agent: wang huimin
Abstract A lithium secondary battery including an electrode assembly composed of positive and negative electrode plates, and a clapboard lamination therebetween in the cell casing, and the lithium secondary battery is 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 alkylbenzene derivative or cycloalkylbenzene derivative having tertiary carbon adjacent a phenyl group. To secure the safety of a battery by using an additive agent that, when added to an electrolytic solution, effectively acts on an overcharge without adversely affecting battery characteristics such as low-temperature characteristics and preservation characteristics.