Lg Chem, Ltd

Toray Industries, Inc.

Lg Energy Solution, Ltd.

Toray Battery Separator Film Co., Ltd.

Toray Battery Seperator Film Co., Ltd.

Joo-Sung Lee

Jong-Hun Kim

Sun-Mi Jin

Bo-Kyung Ryu

Won-Sik Bae

Jang-Hyuk Hong

Jin-Woo Kim

Bi-Oh Ryu

A-Young Lee

Dong-Wook Sung

Da-Kyung Han

Jeong-Min Ha

Hyung-Kyun Yu

Kyung-Ryun Ka

Ji-Eun Kim

Su-Jin Yoon

Bong-Tae Kim

In-Hyouk Sung

Ji-Eun Lee

Byoung-Jin Shin

Hyun-Kyung Shin

Kil-An Jung

Min-Hyung Kim

Heon-Sik Song

Joo-Young Chung

Shin-Hyo Cho

In-Gyoung Yu

Myung-Soo Ko

Je-Young Kim

Yo-Han Kwon

Jong Hun Kim

Pil-Kyu Park

In-Chul Kim

Eun-Kyung Kim

Hye-Jin Kwon

So-Mi Jeong

Sang-Hun Kim

Soo-Ji Hwang

Ji-Young Hwang

Sang-Min Kwak

Dae-Sung Jang

Byeong-Gyu Cho

Won-Pill Hwang

Jun-Hyuk Song

Sung-Jae Han

Ho-Sung Kang

Yern-Seung Kim

Je-Seob Park

Se-Jung Park

A crosslinked polyolefin separator and a method of making the same are disclosed herein. The method includes mixing a polyolefin, a diluting agent, an initiator, a crosslinking catalyst, and inorganic particles surface treated with an alkoxysilane containing a carbon-carbon double bonded group in an extruder to obtain a mixture, and then reactively extruding the mixture to form an extruded silane-grafted polyolefin composition; molding and orienting the extruded silane-grafted polyolefin composition in the form of an oriented sheet; extracting the diluting agent from the oriented sheet to obtain a porous membrane; thermally fixing the porous membrane to obtain a thermally fixed porous membrane; and crosslinking the thermally fixed porous membrane in the presence of moisture.

Cross-linked polyolefin separator and manufacturing method therefor

A polyolefin separator is provided in the present disclosure. The polyolefin separator includes a polyolefin porous substrate including a plurality of fibrils and pores formed by the fibrils draped across one another. A coating layer surrounding the outer side of the fibrils is contained in the polyolefin porous substrate and the coating layer includes a crosslinked polymer, wherein the polyolefin separator having the coating layer has a change in air permeability of 20% or less and a change in basis weight of 4% or less, as compared to the polyolefin porous substrate. A method for manufacturing the polyolefin separator and a secondary battery including the polyolefin separator are also disclosed.

Polyolefin separator and method for manufacturing the same

A system for detecting a defective porous sheet includes a jig having a through-hole, a heating unit, a temperature sensor, a controlling unit, an air permeability-determining unit and a judging unit. In this manner, it is possible to provide a novel system for detecting a porous sheet, which may be a defective separator after being coated with a porous coating layer, beforehand by using the air permeability and shut-down temperature of the porous sheet itself.

Defective porous sheet detection system and detection method

A composite separator for an electrochemical device, including: a porous polymer substrate having a plurality of pores; and a porous coating layer formed on at least one surface of the porous polymer substrate. The porous coating layer includes a plurality of particles and a binder positioned on at least a part of the surface of the particles to connect and fix the particles with one another. The particles include at least one of inorganic particles or organic particles, and the composite separator has a melt-down temperature of 170° C. or higher. An electrochemical device including the composite separator is also disclosed.

Composite separator for electrochemical device and electrochemical device including the same

A lithium secondary battery separator with excellent adhesive strength and air permeability is disclosed. The lithium secondary battery separator includes a porous polymer substrate; and a porous coating layer containing inorganic particles and a binder. When the binder is present as a binder specimen with a thickness of 0.4 mm after pressurization at 190° C., the binder specimen comprises a first binder having a tan δ peak at 15° C. to 27.6° C. and a second binder having a tan δ peak at 8° C. to 20.2° C., as measured by dynamic mechanical analysis (DMA).

Lithium secondary battery separator having enhanced adhesive strength to electrode and improved resistance characteristics, and lithium secondary battery comprising lithium secondary battery separator

A separator for a lithium secondary battery is provided. The separator includes a porous polymer substrate and a porous coating layer positioned on at least one surface of the porous polymer substrate. The porous coating layer includes inorganic particles and a binder polymer. The binder polymer includes a PVdF-based binder polymer, and the PVdF-based binder polymer has a first peak at a 2θ of 18.2±0.2° and a second peak at a 2θ of 19.8±0.2°, as analyzed by X-ray diffractometry (XRD), and a ratio of an area of the second peak to an area of the first peak (the area of the second peak/the area of the first peak) is equal to or more than 1.25 and less than 2.75. The separator for the lithium secondary battery includes fine and uniform pores formed on the surface thereof to provide an increased adhesive surface area to an electrode, resulting in improvement of adhesion to the electrode.

Separator including polymer substrate with porous coating layer containing PVDF-based binder having β-phase and -phase crystals, and lithium secondary battery including the same

A separator for an electrochemical device is provided. The separator includes a porous polymer substrate, and an electrode adhesive layer formed on at least one surface of the porous polymer substrate, wherein the electrode adhesive layer includes a binder polymer and has at least two electrode adhesive layer units including at least two lines extending from a long side to a short side of the separator, and the units do not cross each other. Herein, a unit merely formed by lines extending from one long side to the other long side of the separator, or a unit merely formed by lines extending from one short side to the other short side of the separator is not included. The separator is effective for reducing a time required for impregnation of an electrode with an electrolyte, while providing excellent electrode-separator adhesion.

Separator for electrochemical device comprising a patterned electrode adhesive layer and a method for manufacturing the separator

Provided is a separator for an electrochemical device, including: a porous polymer substrate; and a porous organic/inorganic coating layer formed on at least one surface of the porous polymer substrate and including heat conductive inorganic particles and core-shell particles, wherein the particles are bound to one another by a binder polymer, and wherein the core-shell particle includes a core portion and a shell portion surrounding the surface of the core portion, the core portion includes a metal hydroxide having heat-absorbing property at 150-400° C., the shell portion includes a polymer resin, and the polymer resin is a water-insoluble polymer or crosslinked polymer. An electrochemical device including the separator is also provided. It is possible to provide a separator with an improved heat-absorbing effect and safety, and an electrochemical device including the same.

Separator for electrochemical device, electrochemical device comprising the same and manufacturing method of the separator

Provided is a secondary battery which includes an electrode assembly having an electrode tab extended from an electrode current collector, wherein the electrode tab is provided with an insulation coating layer containing an inorganic filler and a binder, the binder has an electrolyte uptake more than 0% and less than 50%, and the electrolyte uptake is determined by a predetermined method. In the secondary battery according to the present disclosure, the insulation coating layer provided in the electrode tab includes a binder having a low electrolyte uptake, and thus the insulation coating layer has improved adhesion and is prevented from detachment from the electrode tab. As a result, it is possible to maintain an excellent insulation state and to minimize an internal short-circuit in a secondary battery, thereby ensuring safety.

Secondary battery comprising electrode tab provided with insulation coating layer

Disclosed is a method for pre-detecting a defective porous polymer substrate for a separator, including selecting a porous polymer substrate having a plurality of pores; observing the selected porous polymer substrate with a scanning electron microscope (SEM) to obtain an image of the porous polymer substrate; quantifying the average value of pore distribution index (PDI); correcting the quantified average value of pore distribution index to obtain the corrected average value of pore distribution index; determining whether or not the corrected average value of pore distribution index is 60 a.u. (arbitrary unit) or less; and classifying the porous polymer substrate as a good product, when the corrected average value of pore distribution index is determined to be 60 a.u. or less, and classifying the porous polymer substrate as a defective product, when the corrected average value of pore distribution index is determined to be larger than 60 a.u.

Method for pre-detecting defective porous polymer substrate for separator

A separator having low resistance, suitable porosity and electrolyte retention while ensuring heat resistance is provided. The separator includes a porous substrate and a low-resistance coating layer formed on at least one surface of the porous substrate, wherein the low-resistance coating layer includes node(s) containing inorganic particles and a polymer resin covering at least a part of the surfaces of inorganic particles, and filament(s) formed from the polymer resin of the node in a thread-like shape, at least one filament extended from one node is formed, and the filaments are arranged in such a manner that they connect one node with another node.

Separator having inorganic coating layer including small weight average molecular weight and low melting point PVDF, and method for manufacturing the same

A crosslinked polyolefin separator having an average value of light transmittance of 30% or more in a region of 380 nm to 700 nm, after four sides of the separator are fixed and allowed to stand at 130° C. for 30 minutes. A method for manufacturing the crosslinked polyolefin separator is also provided. The crosslinked polyolefin separator has a low shutdown temperature to provide improved safety. The crosslinked polyolefin separator also has a high meltdown temperature and is inhibited from die-drooling.

Cross-linked polyolefin separator and method for producing same

A separator for an electrochemical device, including a porous substrate and an inorganic coating layer formed on at least one surface of the porous substrate and method for manufacturing the same are provided. The inorganic coating layer includes a binder resin and inorganic particles, and the binder resin includes a polyvinylidene fluoride-based resin and shows a low electrolyte absorption ratio. The separator has excellent adhesion with an electrode and shows low resistance characteristics.

Separator for electrochemical device comprising inorganic coating layer and method for manufacturing the same

A crosslinked polyolefin separator which has gels with a longer side length of 50 &#x3bc;m or more in a number ranging from 0 to 3 per 1 mof the separator, and shows a standard deviation of absorbance ratio between the center of the separator and the side thereof ranging from 0.01 to 0.5 is provided. A method for manufacturing the crosslinked polyolefin separator is also provided. The method includes (S1) preparing a polyolefin porous membranes, and (S2) applying a coating solution containing an initiator and alkoxy group-containing vinylsilane onto at least one surface of the porous membrane. The coating solution can permeate even to the inside of exposed pores. Thus, it is possible to provide a crosslinked polyolefin separator in which silane crosslinking occurs uniformly even inside of the pores.

Crosslinked polyolefin separator and manufacturing method therefor

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Daejeon, South Korea

Joo-Sung Lee