Lg Energy Solution, Ltd.

Lg Chem, Ltd

Jun Muk Lim

Joo Yul Baek

Sang Hoon Choy

Je Young Kim

Seul Ki Kim

Ye Lin Kim

Ki Won Sung

Jung Keun Yoo

Hak Yoon Kim

Tea Gon Kim

Chul Haeng Lee

Young Min Lim

Jung Woo Yoo

Woo Ha Kim

Hyun Sik Chae

Hye Lim Shim

In Seong Kim

A positive electrode slurry composition for a secondary battery which includes a positive electrode active material, a carbon-based conductive agent having a specific surface area (Brunauer-Emmett-Teller (BET)) of 100 m/g to 200 m/g, a binder, and a nitrile-based copolymer which has an electrolyte solution swelling degree defined by Equation (1) of 200% or less and does not contain a functional group other than a cyano group is provided:electrolyte solution swelling degree (%)={()/}×100  Equation (1)

Positive electrode slurry composition for secondary battery, and positive electrode for secondary battery and secondary battery which are prepared by using 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

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.

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Daejeon, South Korea

Jun Muk Lim