Lg Energy Solution, Ltd.

Dong Wook Sung

Seung Hyun Lee

Min Ji Kim

Ji Eun Kim

Je An Lee

Kyung Ryun Ka

Da Kyung Han

Jin Young Shin

Yeo Ju Yoon

A separator for an electrochemical device, and an electrochemical device including the same are disclosed. The separator according to an exemplary embodiment of the present disclosure is a separator for an electrochemical device. The separator includes a porous polymer substrate and one porous coating layer on at least one surface of the porous polymer substrate. The porous coating layer includes inorganic hydroxide particles, cellulose nanoparticles, and an aqueous binder polymer. The amount of the cellulose nanofibers is 25% by weight or more and 70% by weight or less based on the total weight of the porous coating layer.

Separator for electrochemical device and electrochemical device comprising same

An electrochemical device separator including a porous polymer substrate and a porous organic/inorganic composite coating layer on at least one surface of the porous polymer substrate. The porous organic/inorganic composite coating layer includes particulate binder polymers, a non-particulate acrylic-containing polymer, and first inorganic particles. The particulate binder polymers include hybrid polymer particles including a fluorine-containing polymer and an acrylic-containing polymer, and acrylic-containing polymer particles. The acrylic-containing polymer particles have a particle size D50 (a) in a range of 1 μm to 7 μm, the first inorganic particles have a particle size D50 (b) in a range of 200 nm to 800 nm, a/b is in a range of 2 to 15, and hybrid polymer particles have a particle size D50 less than 250 nm.

Electrochemical device separator including porous organic/inorganic composite coating layer and electrochemical device including same

A separator for secondary batteries that allows the amount of a dispersing resin that is used and the amount of a dispersant that is used to be reduced in order to prevent an increase in resistance after the separator is coated, which occurs in the case in which a large amount of the dispersing resin is used in order to disperse inorganic matter, and an electrochemical device having the same applied thereto. The amount of a dispersing resin is reduced, whereby it is possible to prevent an increase in resistance after a porous separator is coated, a dispersing resin having a specific weight average molecular weight is mixed, whereby physical properties and dispersivity are improved, and the use of an expensive dispersant is excluded, whereby processing costs are reduced.

Separator including porous polymer substrate, porous coating layer, and resin layer and electrochemical device having the same applied thereto

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Daejeon, South Korea

Dong Wook Sung