Secondary battery
AssigneeSamsung SDI Co., Ltd.
InventorsNari Seo, Bokhyun Ka, Eunhyung Choi, Donghyuk Chang
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Abstract
Provided is a secondary battery, which includes a separator having excellent air permeability such that the separator is adhered to a positive electrode plate and/or a negative electrode plate at a low temperature under a low pressure and swelling in an electrolyte solution is relatively suppressed. The secondary battery includes an electrode assembly including a positive electrode plate, a negative electrode plate and a separator interposed between the positive electrode plate and the negative electrode plate, wherein the separator further includes an adhesive layer formed on its surface, the adhesive layer includes a binder, and a gel-sol transition temperature of the binder is in a range of 70° C. to 90° C.
Claims6
A secondary battery comprising:
- an electrode assembly, said assembly including a positive electrode plate, a negative electrode plate and a separator interposed between the positive electrode plate and the negative electrode plate, wherein the separator further includes an adhesive layer formed on its surface, where the adhesive layer includes a binder, wherein the binder includes a polyvinylidene fluoride-hexafluoropropyl (PVdF-HFP) copolymer having a molecular weight in a range of 1000K g/mol to 1500K g/mol and a gel-sol transition temperature of the binder is in a range of 70° C. to 90° C.,
- wherein the separator and the positive electrode plate or the negative electrode plate are adhered to each other with a binding strength in a range of 0.05 gf/mm to 1.10 gf/mm, and
- wherein the HFP content of the PVdF-HFP copolymer ranges from 3 wt % to 7 wt %.
Dependencies are inferred from the claim text.