Samsung Sdi Co., Inc.

Nari Seo

Kijun Kim

Bokhyun Ka

Donghyuk Chang

Dongho Son

Eunhyung Choi

Junkyu Cha

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&#xb0; C. to 90&#xb0; C.

Secondary battery

A binder composition for a rechargeable battery, including a binder polymer having a glass transition temperature (Tg) of 20&#xb0; C. or less, and having a storage modulus (60&#xb0; C.) of 50-150 MPa. The binder composition according to an embodiment can improve life characteristics of the rechargeable battery by efficiently controlling expansion of a negative electrode plate.

Binder composition for rechargeable battery and rechargeable lithium battery having the same

Growing community of inventors

Yongin-si, South Korea

Nari Seo