Lg Energy Solution, Ltd.

Kyung Ryun Ka

Seung Hyun Lee

Min Ji Kim

Sang Joon Lee

Je An Lee

In Hyouk Sung

Su Jin Park

Dong Wook Sung

Hye Won 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

A separator for an electrochemical device, in which the separator includes a separator substrate and an organic-inorganic composite porous coating layer on at least one surface of the separator substrate. The separator substrate is a porous film including a polyolefin-containing polymer. The organic-inorganic composite porous coating layer includes a polymer resin particles and inorganic particles, in which each particle of the polymer resin particles includes a polyvinylidene fluoride (PVDF)-containing polymer and an acrylic polymer, and the PVDF-containing polymer has a Hansen solubility parameter (HSP) value of 13 or less and 1 or more.

Separator with organic/inorganic porous coating layer for electrochemical device, and electrochemical device including 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 an electrochemical device including a porous polymer substrate and a porous coating layer on at least one side of the porous polymer substrate. The porous coating layer includes first binder particles, second binder particles, and inorganic particles. The inorganic particles are mostly dispersed in a first surface region of the porous coating layer, and the second binder particles are mostly dispersed in a second surface region of the porous polymer substrate, in which the first surface region faces the porous polymer substrate and the second surface region is an opposite surface region to the first surface region. The inorganic particles have a larger weight per particle than each respective weight per particle of the first and second binder particles.

Separator for electrochemical device and an electrochemical device including 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 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.

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Daejeon, South Korea

Kyung Ryun Ka