Electrode with polyamide imide-based binder for lithium secondary battery and lithium secondary battery comprising the same

摘要

An electrode for a lithium secondary battery and a lithium secondary battery including the same, the electrode including a polyamide imide (PAI)-based binder, wherein a 1,3-benzenediamine peak is not observed when a composition including components extracted from the electrode by a solvent capable of dissolving the polyamideimide (PAI)-based binder is analyzed with pyrolysis-gas chromatography (Py-GC) under conditions of a pyrolysis temperature of about 750 to about 780° C., a pyrolysis time of about 5 seconds to about 15 seconds, and increasing a gas chromatography oven temperature from about 40° C. to about 300° C. at a rate of about 10° C./min.

主权项

1. A lithium secondary battery, the lithium secondary battery comprising:
an electrode including a polyamide imide (PAI)-based binder, wherein:
the electrode includes a positive electrode, the positive electrode including a positive active material layer and a current collector,the electrode includes the polyamideimide (PAI)-based binder in an amount of about 3 wt % to about 5 wt % based on the weight of the positive active material layer, andwherein forming the electrode consists essentially of
mixing an active material, a conductive material, and the PAI-based binder with a solvent to form an active material composition;disposing the active material composition on a current collector to form a coating;performing a drying process at a temperature of from 80° C. to 145° C. for about 2 to 20 hours to form a dried coating; andpressing the dried coating to provide an electrode, anda 1,3-benzenediamine peak is not observed when a composition including components extracted from the electrode by a solvent capable of dissolving the polyamideimide (PAI)-based binder is analyzed with pyrolysis-gas chromatography (Py-GC) under conditions of a pyrolysis temperature of about 750 to about 780° C., a pyrolysis time of about 5 seconds to about 15 seconds, and increasing a gas chromatography oven temperature from about 40° C. to about 300° C. at a rate of about 10° C./min.