Lg Energy Solution, Ltd.

Lg Chem, Ltd

Joo Yul Baek

Jun Muk Lim

Sang Hoon Choy

Je Young Kim

Seul Ki Kim

Sung Joon Oh

Young Geun Choi

Jeong Kyu Lee

Ye Lin Kim

Chul Haeng Lee

Dong Hun Lee

Ki Won Sung

Song Taek Oh

In Young Song

Jung Keun Yoo

Hak Yoon Kim

Jong Chan Lee

Tea Gon Kim

Young Min Lim

Hee Won Choi

Tae Gon Kim

Woo Ha Kim

Chan Ki Park

Il Geun Oh

Min Kwak

Hyun Sik Chae

Chang Ju Lee

Hyo Sik Kim

Jung Hoon Han

In Seong Kim

Yeon Ji Oh

A positive electrode includes a current collector and a positive electrode active material layer disposed on the current collector, wherein the positive electrode active material layer includes a positive electrode active material, carbon nanotube, and a binder, the binder includes polyvinylidene fluoride which has a weight average molecular weight of 720,000 g/mol to 980,000 g/mol, a BET specific surface area of the carbon nanotube is 140 m/g to 195 m/g, and the positive electrode satisfies the following Formula 1:1.3≤≤3.4  [Formula 1]

Positive electrode and secondary battery including the positive electrode

Disclosed is a negative electrode including a negative electrode active material layer, wherein the negative electrode active material layer includes a negative electrode active material and a conductive agent. The negative electrode active material includes carbon-based active material particles including natural graphite and an amorphous carbon-based material. The carbon-based active material particles have a specific surface area of 1.4 m/g to 2.3 m/g, and the conductive agent includes carbon nanotubes having an average length of 1 μm to 12 μm. A secondary battery including the negative electrode is also disclosed.

Negative electrode and secondary battery including the negative electrode

The present invention relates to an electrode for a secondary battery in which a first electrode material mixture layer including a first negative electrode active material, a first conductive agent, and a first binder is formed on a current collector, and a second electrode material mixture layer including a second negative electrode active material, a second conductive agent, and a second binder is formed on the first electrode material mixture layer, wherein the first negative electrode active material and the second negative electrode active material each include at least one selected from the group consisting of natural graphite and artificial graphite, and when the electrode is analyzed by a shear strength analysis method, a ratio of a maximum value (σ) to a minimum value (σ) in a simplified shear strength (σ) profile is 1.7 or less.

Electrode for secondary battery and lithium secondary battery comprising the same

The present invention relates to a negative electrode including a negative electrode collector, a first negative electrode active material layer disposed on the negative electrode collector, and a second negative electrode active material layer disposed on the first negative electrode active material layer, wherein the second negative electrode active material layer includes a second negative electrode active material and a second conductive agent, wherein the second negative electrode active material includes a silicon-based active material, the silicon-based active material includes SiO(0≤x<2), the second conductive agent includes a carbon nanotube structure in which 2 to 5,000 single-walled carbon nanotube units are bonded side by side, and the carbon nanotube structure is included in an amount of 0.01 wt % to 1.0 wt % in the second negative electrode active material layer, and a secondary battery including the same.

Negative electrode and secondary battery including the same

The present invention relates to a method of reusing a positive electrode material, and more particularly, the method includes: inputting a positive electrode for a lithium secondary battery comprising a current collector, and a positive electrode active material layer formed on the current collector and including a first positive electrode active material, a first binder and a first conducting agent, into a solvent; separating at least a portion of the positive electrode active material layer from the current collector; adding second binder powder to the solvent and performing primary mixing a resulting mixture; and preparing a positive electrode material slurry by adding a second positive electrode active material and a second conducting agent to the solvent and performing secondary mixing a resulting mixture.

Method of reusing positive electrode material

A method for producing a composite conductive material having excellent dispersibility is provided. The method includes supporting a catalyst on surfaces of carbon particles; heat treating the catalyst in a helium or hydrogen atmosphere such that the catalyst penetrate the surfaces of the carbon particles and are impregnated beneath the surfaces of the carbon particles at a contact point between the carbon particles and the impregnated catalyst; and heating the carbon particles having the impregnated catalyst disposed therein in the presence of a source gas to grow carbon nanofibers from the impregnated catalyst to form a composite conductive material, wherein the source gas contains a carbon source, and wherein the carbon nanofibers extend from the contact point to above the surfaces of the carbon particles.

Composite conductive material having excellent dispersibility, slurry for forming lithium secondary battery electrode using the same, and lithium secondary battery

A positive electrode includes: a current collector; and a positive electrode active material layer disposed on the current collector, wherein the positive electrode active material layer includes a positive electrode active material, a conductive material, and a binder, the conductive material contains at least one of carbon black or a carbon nanotube and the binder contains polyvinylidene fluoride to which a functional group is bonded, and the functional group has a carboxyl group, and in the polyvinylidene fluoride to which the functional group is bonded.

Positive electrode having improved adhesion and energy density, and lithium secondary battery including the same

A secondary battery includes a positive electrode, a negative electrode, a separator disposed between the positive electrode and the negative electrode, and an electrolyte solution, wherein the positive electrode includes a current collector and a positive electrode active material layer disposed on the current collector, the positive electrode active material layer includes a positive electrode active material and carbon nanotubes, and the electrolyte solution includes a non-aqueous solvent, a lithium salt, and tetravinylsilane.

Secondary battery

A positive electrode includes a positive electrode active material layer including a positive electrode active material, a conductive material, and a binder, wherein the positive electrode active material contains any one among Li(Nix1Mny1Coz1)O2 (0.55&#x3c;x1&#x3c;0.69, 0.15&#x3c;y1&#x3c;0.29, 0.15&#x3c;z1&#x3c;0.29, x1+y1+z1=1) and Li(Nix2Mny2Coz2)O2 (0.75&#x3c;x2&#x3c;0.89, 0.05&#x3c;y2&#x3c;0.19, 0.05&#x3c;z2&#x3c;0.19, x2+y2+z2=1) and the conductive material contains a carbon nanotube, and when the positive electrode active material is Li(Nix2Mny2Coz2)O2, the positive electrode active material layer satisfies Relation 1 and when the positive electrode active material is Li(Nix2Mny2Coz2)O2, the positive electrode active material layer satisfies Relation 2:0.0020&#xd7;&#x3c;0.0050&#xd7;&#x2003;&#x2003;[Relation 1]0.0015&#xd7;&#x3c;0.0044&#xd7;&#x2003;&#x2003;[Relation 2]

Positive electrode and secondary battery including same

A method for quantitatively analyzing cohesive failure of an electrode analyzes cohesive failure of an electrode and includes preparing an electrode in which an electrode material mixture layer including an electrode active material, a conductive agent, and a binder is formed on a current collector, measuring shear strength (&#x3c3;) data according to a cutting depth while cutting the electrode material mixture layer from a surface thereof until reaching the current collector using a surface and interfacial cutting analysis system (SAICAS), obtaining a regression curve of shear strength according to the cutting depth from the shear strength (&#x3c3;) data, and determining a cutting depth, at which the shear strength is minimum in the regression curve, as a location of cohesive failure.

Method for analyzing cohesive failure of electrode

Provided is an analysis method for a crack rate of an electrode active material of an electrode, comprising the steps of: forming an electrode including an electrode active material, a binder, and a conductive material; impregnating the electrode with a resin and visualizing material regions including the electrode active material, the binder, and the conductive material which are included in the electrode, and a pore region; cutting the electrode and forming an electrode cross-section sample; photographing a cross section of the electrode cross-section sample using a scanning electron microscope and obtaining a cross-sectional image; performing primary image processing on the cross-sectional image and extracting total surface area pixels of the electrode active material; performing secondary image processing on the cross-sectional image and extracting total boundary pixels of the electrode active material; and calculating a crack rate of the electrode active material of the electrode in the cross-sectional image.

Analysis method for crack rate of electrode active material of electrode for lithium secondary battery

Provided are a positive electrode for a secondary battery which includes a positive electrode collector, a porous positive electrode active material layer disposed on a surface of the positive electrode collector and including a positive electrode active material and first carbon nanotubes, and a conductive layer disposed on a surface of the positive electrode active material layer, wherein the conductive layer includes a porous network structure formed by a plurality of second carbon nanotubes and has a porosity equal to or greater than a porosity of the positive electrode active material layer +10 vol %, and a secondary battery including the same.

Positive electrode for secondary battery and secondary battery including the same

The present invention provides a composite conductive material having excellent dispersibility and a method for producing the same. In an embodiment, the method includes supporting a catalyst on surfaces of carbon particles; heat treating the catalyst in a helium or hydrogen atmosphere such that the catalyst penetrate the surfaces of the carbon particles and are impregnated beneath the surfaces of the carbon particles at a contact point between the carbon particles and the impregnated catalyst; and heating the carbon particles having the impregnated catalyst disposed therein in the presence of a source gas to grow carbon nanofibers from the impregnated catalyst to form a composite conductive material, wherein the source gas contains a carbon source, and wherein the carbon nanofibers extend from the contact point to above the surfaces of the carbon particles.

A method for preparing an electrode for a secondary battery, includes preparing an electrode slurry having an electrode active material and a binder and producing a pre-electrode by coating a first surface of both surfaces of a current collector with the electrode slurry while the first surface is disposed in an upward direction. Additionally, the method includes drying the pre-electrode while the electrode slurry coated on the first surface of the current collector is inverted to be disposed in a downward direction.

Method for preparing an electrode for a secondary battery

The present invention relates to a method of manufacturing an electrode current collector for a secondary battery and an electrode including an electrode current collector manufactured using the method. In particular, provided herein are a method of manufacturing an electrode current collector for a secondary battery which includes forming a CNT coating layer on a surface of an electrode current collector to increase electrical conductivity, and an electrode including an electrode current collector manufactured according to the method.

Method of manufacturing electrode current collector for secondary battery and electrode including electrode current collector manufactured using the method

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Daejeon, South Korea

Joo Yul Baek