Sk Innovation Co., Ltd.

Lg Energy Solution, Ltd.

Lg Chem, Ltd

Sk Ie Technology Co., Ltd.

Iljin Electric Co., Ltd.

Sk on Co., Ltd.

Jae Woong Kim

Hyoung Kwon Kim

Dong Jin Joo

Sang Uck Kim

Kyu Young Cho

Yong Kyoung Kim

Young Jun Woo

Yun Bong Kim

Jang-weon Rhee

Seung Chul Lee

Su Ji Lee

Jung Moon Sung

Whee Sung Kim

Dong Man Cho

Je Young Kim

Sang Hoon Choy

Min Gu Kang

Min Hee Lee

Joo Hwan Sung

Yong Hyun Cho

Sun Kyu Kim

Ye Lin Kim

Dong Kyu Kim

Young Hoon Do

Cheol Ho Park

Young Pil Choi

Jong Heon Seol

Seon Kyong Kim

Yeo Min Yoon

Ik Jong Lee

Min Seok Sung

Jong Goo Kang

Ki Duck Park

Yoon Seong Cho

Hyang Yeon Kim

Chul Gyu Bae

Yun Kyung Jo

Jeong Han Kim

The present invention relates to a separator including a coating layer and a substrate, wherein phase-change peak temperatures measured by differential scanning calorimetry (DSC) at the time of a first temperature increase and at the time of a second temperature increase satisfy specific ranges, a method of producing the same, and an electrochemical device including the same. More particularly, the present invention relates to a separator that has improved thermal resistance and thus may improve battery safety and implement stable movement of lithium ions and a lithium secondary battery including the same.

Separators improved thermal resistance and secondary battery comprising same

The present invention relates to a secondary battery in which an electrode tab is improved in mechanical strength and a method for manufacturing the same. Also, the secondary battery according to the present invention includes: an electrode provided with a coating portion coated with an active material on an electrode collector and a non-coating portion on which the active material is not applied to the electrode collector, the non-coating portion being adjacent to the coating portion in a width direction perpendicular to a longitudinal direction of the electrode collector, the non-coating portion having a plurality of notching tabs formed therein such that each of the plurality of notching tabs extends away from the coating portion in a width direction. When the electrode assembly is in the wound state, the plurality of notching tabs are circumferentially distributed about a central axis of the electrode assembly.

Secondary battery and method for manufacturing the same

An electrode for a secondary battery may include an electrode collector, a coating portion having an active material coated on the electrode collector, a first non-coating portion on which the active material is not applied to the electrode collector, and a second non-coating portion on which the active material is not applied to the electrode collector. The first non-coating portion may be adjacent to the coating portion in a width direction perpendicular to a longitudinal direction of the electrode collector, the first non-coating portion having a longitudinal dimension extending along the longitudinal direction, the first non-coating portion configured to be bent and electrically coupled to a can member of the secondary battery. The second non-coating portion may be adjacent to the coating portion in the longitudinal direction. The electrode may be stacked into a stack with a separator and a second electrode of an opposite polarity than the electrode.

The present invention relates to a secondary battery in which an electrode tab is improved in mechanical strength and a method for manufacturing the same. Also, the secondary battery according to the present invention includes: an electrode provided with a coating portion coated with an active material on an electrode collector and a non-coating portion on which the active material is not applied to the electrode collector in a longitudinal direction of the electrode collector and a notching tab part extending from the coating portion in a width direction of the electrode collector without coating with the active material and overlapping each other to form two or more layers when the electrode is wound.

Provided herein are a positive electrode for a secondary battery and a secondary battery including the same. The positive electrode includes a positive electrode active material layer including a positive electrode active material, a conductive material, and a dispersant, wherein the conductive material includes bundle-type carbon nanotubes, units of which have an average strand diameter of 15 nm or less, and the positive electrode active material layer has a packing density of 3.0 g/cc or more, and has an average pore diameter of 0.1 &#x3bc;m to 0.5 &#x3bc;m at the packing density when a pore size distribution is measured by mercury intrusion porosimetry, and thus may exhibit excellent electrolyte wetting properties. As a result, when the positive electrode is applied to a battery, wetting time of the positive electrode is shortened, and an area of the positive electrode that is not filled with an electrolyte is reduced, resulting in enhanced battery performance.

Positive electrode having improved pore structure in positive electrode active material layer

A lithium secondary battery includes a plurality of electrode cells, each of which includes a first electrode, a second electrode having a different polarity from that of the first electrode and a separation layer interposed between the first electrode and the second electrode, and at least one ion permeation barrier between neighboring ones of the electrode cells. The ion permeation barrier has an air permeability less than that of the separation layer.

Lithium secondary battery

The present invention relates to a composite separation membrane for a lithium secondary battery, having an excellent effect of improving the life time and safety of a battery and a lithium secondary battery including the membrane. The composite separation membrane includes a porous base layer; a heat-resistant layer formed on one side or both sides of the porous base layer; and a fusion layer formed on an outermost layer. The heat-resistant layer includes inorganic particles connected and fixed by binder polymers, and the fusion layer includes crystalline polymers in the form of particles having a melting temperature of 100&#xb0; C. or higher.

Composite separation membrane for lithium secondary battery and manufacturing method therefor

The present disclosure provides a method that includes forming a tab arrangement by vertically arranging the electrode tabs whereby at least parts of the electrode tabs overlap each other; irradiating light to at least two side surfaces among side surfaces of the tab arrangement excluding surfaces on which the electrode tabs overlap and surfaces facing the overlapped surfaces; scanning a planar shape of a step on which the electrode tabs do not overlap each other using light reflected from an end portion of each of the electrode tabs; scanning only an overlapped portion of the electrode tabs excluding the step based on the scanned result; setting a welding range within the overlapped portion; and performing welding only within the welding range.

Welding method capable of improving welding reliability by precisely setting welding portions of the electrode taps

Provided are a micro-porous hybrid film and a method for preparing the same, and more particularly, a micro-porous hybrid film capable of improving reliability of a battery by simultaneously improving thermal stability at a high temperature and water properties, and a method for preparing the same. In addition, the present invention relates to a micro-porous hybrid film suitable for a separator of a high capacity/high output lithium secondary battery capable of increasing production stability, long term stability, and performance of the battery by improving adhesive force between a micro-porous film and a coating layer and permeability and minimizing a water content by the coating layer.

Micro-porous hybrid film having electro-chemical stability and method for preparing the same

The present invention relates to a composite separation membrane for a lithium secondary battery having excellent lifetime and safety improvement effects, and a preparation method therefor and, more specifically, to a composite separation membrane for a lithium secondary battery, including: a porous base layer; a heat resistant layer formed on one surface or both surfaces of the porous base layer; and a fusion layer formed on the outermost layer. Inorganic particles in the heat resistant layer are connected and fixed by a binder polymer, and the fusion layer is prepared by comprising amorphous polymer particles having a glass transition temperature of 30 to 90&#xb0; C. and a difference between a fusion temperature and the glass transition temperature of 60&#xb0; C. or lower.

Fusion type composite separation membrane for lithium secondary battery, and preparation method therefor

A negative electrode active material for a lithium secondary battery according to an exemplary embodiment of the present invention includes an alloy containing silicon (Si), titanium (Ti), and iron (Fe), wherein the degree of amorphization of the alloy is raised by 40% or more by further adding copper (Cu) to the alloy.

Negative electrode active material for lithium secondary battery

The following disclosure relates to a microporous polyolefin composite film having excellent heat resistance and thermal stability, and a method for manufacturing the same. More particularly, the present invention relates to a microporous polyolefin composite film capable of improving stability and reliability of a battery by heat sealing an edge of a microporous film provided with a coating layer that includes a polymer binder and inorganic particles, and a method for manufacturing the same.

Microporous polyolefin composite film having excellent heat resistance and thermal stability and method for manufacturing the same

Growing community of inventors

Daejeon, South Korea

Jae Woong Kim