Lg Energy Solution, Ltd.

Sk Innovation Co., Ltd.

Lg Chem, Ltd

Sk Ie Technology Co., Ltd.

Je-An Lee

Hye-Jin Kwon

Su-Jin Yoon

Myeong-Soo Kim

Young-Keun Lee

Jang-weon Rhee

In-Hyouk Sung

Seung-hyun Lee

Gwi-Gwon Kang

Kyung-Ryun Ka

In-Hwa Jung

Dong-Wook Sung

So-Mi Jeong

Da-Kyung Han

Dae-Sung Jang

Sang-Joon Lee

Byoung-Cheon Jo

Jin-Young Shin

Yeon-Soo Kim

Kwan-Woo Nam

Hyun-Sup Lee

Young-Bok Kim

Jung-Moon Sung

In-hwa Jung

Chol-Ho Lee

Sang-Eun Kim

Myung-Han Lee

A separator for a lithium secondary battery. The separator for a lithium secondary battery is provided with a porous coating layer including small-particle diameter inorganic particles, large-particle diameter inorganic particles and adhesive polymer particles. The porous coating layer has a predetermined level of porosity. The separator has reinforced heat resistance, reduced resistance and improved peel strength to a porous polymer substrate.

Separator for lithium secondary battery and method for manufacturing the same

A separator for a secondary battery comprising a porous polymer substrate; a first layer on at least one surface of the porous polymer substrate, wherein the first layer includes inorganic particles and a nonparticulate acrylic polymer having a glass transition temperature of 15° C. or less, wherein the nonparticulate acrylic polymer connects and fixes the inorganic particles; and a second layer on an upper surface of the first layer, wherein the second layer includes a particulate acrylic polymer having a glass transition temperature of 20° C. to 50° C. The separator for a secondary battery has good adhesion with the electrode and can solve the resistance problem in the presence of the inorganic particles.

Separator for secondary battery, manufacturing method thereof, method for manufacturing secondary battery comprising the separator and secondary battery manufactured by the method

A separator and an electrochemical device including the same. The separator includes an adhesive layer including first adhesive resin particles having an average particle diameter corresponding to 0.8-3 times of an average particle diameter of the inorganic particles and second adhesive resin particles having an average particle diameter corresponding to 0.2-0.6 times of the average particle diameter of the inorganic particles, wherein the first adhesive resin particles are present in an amount of 30-90 wt % based on a total weight of the first adhesive resin particles and the second adhesive resin particles. The separator shows improved adhesion to an electrode and provides an electrochemical device with decreased increment in resistance after lamination with an electrode.

Separator and electrochemical device containing the same

A method for evaluating the stability of a separator, including the steps of: preparing a separator; determining the elongation properties of the separator by using dynamic mechanical analysis (DMA); comparing the determined value with the stability standards of the elongation properties; and classifying a separator as a stability-passing separator when the determined values satisfy the stability standards, and classifying a separator as a stability-failing separator when the determined values do not satisfy the stability standards, after the comparison.

Method for evaluating stability of separator

A separator with improved heat resistance and low resistance as well as Lami Strength that is equal or similar to that of the existing separator by using a predetermined amount of polyvinylpyrrolidone binder polymer relative to a polyvinylidene fluoride-based binder polymer, and a manufacturing method thereof.

Method for manufacturing separator for electrochemical device

The present disclosure relates to a separator and an electrochemical device including the same. The separator includes a porous coating layer formed on at least one surface of the porous polymer substrate, wherein the porous coating layer includes, as a binder polymer, an amorphous adhesive binder polymer, and at least one fluorinated binder polymer. It is possible to provide a separator which shows low resistance and significantly improved adhesion to an electrode, and an electrochemical device including the same.

Separator including porous coating layer with amorphous adhesive binder polymer and fluorinated binder polymer and electrochemical device including the same

A separator for an electrochemical device, including: a porous polymer substrate; and a porous coating layer formed on at least one surface of the porous polymer substrate and containing a plurality of microcapsules and a binder polymer positioned on the whole or a part of the surface of the microcapsules to connect and fix the microcapsules with one another, wherein the microcapsules include metal hydroxide particles, and capsule coating layer surrounding each surface of the metal hydroxide particles. An electrochemical device including the separator, and the microcapsules are also provided. The microcapsules and separator show excellent flame resistance and can reduce degradation of battery performance caused by water adsorbability of the plurality of a metal hydroxide particle.

Microcapsules, separator comprising same and electrochemical device comprising same

A method for manufacturing a separator, including the steps of: (S1) preparing a pre-dispersion including inorganic particles dispersed in a pre-dispersion solvent and a first binder polymer dissolved in the pre-dispersion solvent; (S2) conducting a preliminary milling of the pre-dispersion; (S3) preparing a binder polymer solution including a second binder polymer dissolved in a binder polymer solution solvent; (S4) mixing the pre-dispersion with the binder polymer solution and carrying out a secondary milling to obtain a slurry for forming a porous coating layer; and (S5) applying the slurry to at least one surface of a porous polymer substrate, followed by drying, is disclosed. A separator obtained by the method and an electrochemical device including the same are also disclosed. According to the present disclosure, it is possible to provide a separator having a uniform surface and showing improved adhesion.

Method for manufacturing separator, separator formed thereby, and electrochemical device including same

A method for manufacturing a separator, including the steps of: (S) preparing a dispersion containing inorganic particles dispersed in a first solvent and a first binder polymer dissolved in the first solvent; (S) preparing a binder polymer solution containing a second binder polymer dissolved in a second solvent, and mixing the binder polymer solution with the dispersion so that a combined weight of the inorganic particles and the first binder polymer in the dispersion may be 1.5-8 times of a weight of the second binder polymer in the binder polymer solution; and (S) applying the resultant mixture to at least one surface of a porous polymer substrate, followed by drying, to form a porous coating layer on the porous polymer substrate. Also, a separator obtained by the method and an electrochemical device including the same.

Separator fabrication method, separator fabricated thereby, and electrochemical element comprising same separator

Disclosed in the present invention are a microporous polyethylene film and a method of manufacture thereof. The polyethylene microporous film manufactured according to the present invention may contribute to an increased productivity of stable products as its extrusion and stretching may be done readily. And thus manufactured product may be used for battery separators and various filters owing to its high gas permeability, superior puncture strength, and small ratio of shrinkage.

Microporous polyethylene film manufactured according to liquid-liquid phase separation and method of producing the same

The present invention is related to microporous polyolefin films that may be used for battery separators and the methods of manufacturing the same. These microporous polyolefin films are characterized by being manufactured in a method comprising the steps of melt-extruding a composition, comprised of 20-50 weight % of a resin composition, comprised of 90-98 weight % of polyethylene (Component I) having a weight average molecular weight of 2&#xd7;10&#x2dc;4&#xd7;10and less than 5 weight % of molecules of which molecular weight is less than 1&#xd7;10and less than 5 weight % of molecules of which molecular weight is greater than 1&#xd7;10, and 2-10 weight % of polypropylene (Component II) of which weight average molecular weight is 3.0&#xd7;10&#x2dc;8.0&#xd7;10and the peak of the melting point is higher than 145&#xb0; C., and 80-50 weight % of a diluent (Component III), to mold in the form of sheets; stretching the above sheets to the form of films; extracting the diluent from the above films; and heat-setting the above films. They are also characterized by having a puncture strength of greater than 0.14 N/&#x3bc;m, Darcy's permeability constant of greater than 1.5&#xd7;10Darcy, shut-down temperature of microporous films of lower than 140&#xb0; C., and melt-down temperature of higher than 160&#xb0; C. They can enhance the performance and stability of batteries using them as well as the productivity of microporous films owing to their high thermal stability and superior extrusion compoundability and physical properties.

Growing community of inventors

Daejeon, South Korea

Je-An Lee