Lg Energy Solution, Ltd.

Sang Joon Lee

Tae Gon Kim

Je An Lee

Su Jin Park

Min Kwak

Kyung Ryun Ka

Su Jin Yoon

Jeong Gil Kim

In Hyouk Sung

Hye Jin Kwon

Myeong Soo Kim

A separator having a polyolefin substrate, first coating layer including first inorganic particles on at least one surface of the polyolefin substrate and a second coating layer including second inorganic particles on a surface of the first coating layer opposite the polyolefin substrate. An average particle size of the first inorganic material particles of the first coating layer is greater than an average particle size of the second inorganic material particles of the second coating layer. The first inorganic particles of the first coating layer are 900 nm or more based on D50, and the second inorganic particles of the second coating layer are 10 nm or more and 500 nm or less based on D50.

Separator comprising dual coating layers and secondary battery comprising the same

Disclosed is an electrode assembly manufacturing method, in which, in a step of stacking and pressing electrodes and a separator, the pressing is performed in that state in which pores of a porous substrate are filled with a polymer solution. The form or volume of the pores is not changed due to the polymer solution. Consequently, porosity of the separator after manufacture of an electrode assembly is similar to porosity of the separator before stacking. As a result, a battery including the electrode assembly has high ionic conductivity and excellent performance.

Electrode assembly manufacturing method, electrode assembly, and electrochemical device including the same

A separator for a secondary battery having a separator substrate and a coating layer formed on the separator substrate. The coating layer is on at least one surface of the separator substrate. The coating layer comprises an acrylate-based binder and an additive. The additive is a fluorine-based non-ionic surfactant, and provides a separator for a secondary battery with significantly improved electrolyte impregnation rate.

Separator for secondary battery having excellent electrolyte impregnation

A separator for secondary batteries, including: a separator substrate having at least one surface, wherein the separator substrate includes a polyolefin-based polymer resin having a porous structure and a coating layer is applied to one surface or opposite surfaces of a separator substrate made of a polyolefin-based polymer resin having a porous structure, wherein the coating layer includes a thickener, a filler, a particle-type binder, and a dissolution-type binder, wherein the thickener comprises carboxymethyl cellulose, and wherein an amount of the particle-type binder is greater than an amount of the dissolution-type binder.

Separator including separator substrate with coating layer including carboxymethyl cellulose, particle-type binder, and dissolution-type binder

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Daejeon, South Korea

Sang Joon Lee