To provide a technique for a sealed lithium secondary battery including a current interruption mechanism, by which excellent battery performance is obtained and the safety thereof can be improved.
In a sealed lithium secondary battery, an electrode body having a positive electrode, an electrolyte, and an aromatic compound generating gas when the voltage thereof exceeds a predetermined battery voltage are housed within a battery case, and a current interruption mechanism operated when an internal pressure in the battery case is raised is included. The positive electrode includes a positive electrode mixture layer containing graphite as a conductive material. In the graphite, a ratio (ID/IG) between a D peak intensity (ID) and a G peak intensity (IG) in a Raman spectrum obtained by Raman spectroscopy using argon laser having an excitation wavelength of 514.5 nm is 0.2 or more and 0.7 or less. In a battery having the graphite satisfying the ratio in the positive electrode mixture layer, a gas generation amount in overcharge is increased, so that a current interruption device can be early operated.
EBISAKI HIDEYO
KOYAMA YUTAKA
ISHII KENTA
SAITO ATSUSHI
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