Lg Chem, Ltd

Lg Energy Solution, Ltd.

Korea Institute of Geoscience and Mineral Resources

Young-Jae Kim

Je-Young Kim

Min-Seok Kim

Jae-chun Lee

Jung-Woo Yoo

Chan-Soo Jun

Ye-Lin Kim

Jeong-Soo Sohn

Hyun-Sik Park

Min-Chul Ha

Dong-Hyo Yang

Jin-Gi Jeong

Do-Yun Shin

Soo-Kyung Kim

A negative electrode for a lithium secondary battery having excellent dispersibility, adhesion and tensile strength, and a lithium secondary battery including the same. The negative electrode for a lithium secondary battery includes negative electrode active material particles, a conductive material and a binder. The binder includes a copolymer comprising acrylamide monomer-derived repeating units, acrylic acid monomer-derived repeating units, sodium acrylate monomer-derived repeating units and acrylonitrile monomer-derived repeating units. The combined weight of the acrylic acid monomer-derived repeating units and sodium acrylate monomer-derived repeating units in the copolymer is 25 wt % to 35 wt %. The negative electrode active material particles are silicon-based negative electrode active material particles.

Binder for negative electrode of lithium secondary battery and negative electrode for lithium secondary battery including the same

Disclosed is a negative electrode for a lithium secondary battery having excellent electric conductivity and adhesion even though a high-loading negative electrode is used, and the negative electrode includes a negative electrode current collector; a first negative electrode mixture layer containing a first negative electrode active material, a first polymer binder and a first conductive material and formed on at least one surface of the negative electrode current collector; and a second negative electrode mixture layer containing a second negative electrode active material, a second polymer binder and a second conductive material and formed on an upper surface of the first negative electrode mixture layer, wherein the first negative electrode active material contains natural graphite and silicon oxide, and the second negative electrode active material contains artificial graphite.

Negative electrode for lithium secondary battery and lithium secondary battery comprising the same

The present disclosure is intended to reduce the resistance of a high-loading electrode, to improve the impregnation ability of an electrolyte and thus to improve the rate characteristics of a battery. The present disclosure provides a method for manufacturing an electrode which includes the steps of: a coating step in which electrode active material slurry containing an electrode active material, a binder and a solvent is applied to at least one surface of an electrode current collector; a drying step in which the electrode current collector coated with the electrode active material slurry is introduced continuously to a drying system to dry the coated electrode active material slurry; and a rolling step in which the dried electrode active material slurry is rolled, wherein the coating step includes applying the electrode active material slurry in a loading amount of 500 mg/cmto 1500 mg/cm, and the method further comprises a pattern forming step carried out simultaneously with the drying step and forming a plurality of longitudinal patterns on the surface of the coated electrode active material slurry.

Method for manufacturing electrode

The present invention relates to a method for preparing electrode active material slurry, and an electrode active material slurry prepared by the method, the method comprising the steps of: (S1) mixing a conductive agent and a first dispersion medium to thus prepare a conductive agent dispersion, and mixing an electrode active material and a second dispersion medium to thus prepare an electrode active material dispersion; and (S2) dispersing the conductive agent dispersion while adding the same to the electrode active material dispersion.

Method for preparing electrode active material slurry, and electrode active material slurry prepared by method

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Daejeon, South Korea

Young-Jae Kim