BATTERY CELL AND METHOD FOR MANUFACTURING SAME

Provided is a battery cell which includes an electrode assembly received in a battery casing and including a positive electrode, a negative electrode and a separator interposed between the positive electrode and the negative electrode, wherein the separator includes a porous polymer substrate, a fir...

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Bibliographische Detailangaben
Hauptverfasser:	JUNG, Bum-Young, PARK, Jun-Soo
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	BASIC ELECTRIC ELEMENTS ELECTRICITY PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY
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Beschreibung
Zusammenfassung:	Provided is a battery cell which includes an electrode assembly received in a battery casing and including a positive electrode, a negative electrode and a separator interposed between the positive electrode and the negative electrode, wherein the separator includes a porous polymer substrate, a first organic/inorganic porous coating layer formed on at least one surface of the porous polymer substrate, and a second organic/inorganic porous coating layer formed on the first organic/inorganic porous coating layer, the first organic/inorganic porous coating layer includes first inorganic particles and a first binder polymer, the second organic/inorganic porous coating layer includes second inorganic particles and a second binder polymer, the second organic/inorganic porous coating layer faces the positive electrode, and the second binder polymer has a weight average molecular weight higher than the weight average molecular weight of the first binder polymer. The battery cell shows increased adhesion between the positive electrode and the separator. Therefore, it is possible to enhance the overcharge safety without any additional device.