Lg Chem, Ltd

Eun Joo Park

Min Ah Kang

Dong Jo Ryu

Young Min Kim

Young-Min Kim

Disclosed is a binder composition for secondary batteries, wherein conjugated diene latex particles (A) having an average particle diameter of 50 nm or more and 200 nm or less and acrylic copolymer latex particles (B) having an average particle diameter of 300 nm or more and 700 nm or less are present as an independent phases, and the acrylic copolymer latex particles (B) are included in an amount of 1% to 30% by weight based on a mass of a solid. When the binder composition according to the present invention is applied to an electrode mixture and lithium secondary battery, superior binding force may be maintained between electrode materials and between an electrode material and a current collector, which suffer volume change during charge/discharge, and a secondary battery having superior initial capacity and efficiency may be provided. In addition, thickness increase and gas generation are decreased at high temperature and thus swelling is decreased, whereby a battery having enhanced safety may be provided.

Binder composition for secondary batteries, electrode using the same, and lithium secondary battery

Disclosed are a binder with a core-shell structure for a secondary battery electrode, and a secondary battery including the same, wherein the core includes styrene-butadiene rubber (SBR), the shell includes a copolymer of two or more monomers selected from the group consisting of a conjugated diene-based monomer, a (meth)acrylic ester-based monomer, an acrylate-based monomer, a vinyl-based monomer, a nitrile-based monomer, and an ethylenically unsaturated carboxylic acid monomer, and the binder includes a functional group providing binding capacity to surfaces of the SBR particles. Such a binder provides excellent adhesive strength and elasticity and, thus, overall performance of a secondary battery including the same may be improved.

Binder for secondary batteries and secondary battery including the same

Disclosed is a binder for secondary battery electrodes, the binder including polymer particles being prepared from monomers comprising (A) (meth)acrylic acid ester based monomers; (B) at least one monomer selected from the group consisting of an acrylate based compound, a styrene based compound, and a compound having a cyano group; (C) unsaturated monocarbonic acid based monomers; (D) (meth)acrylamide based monomers; and (E) monomers including at least one epoxy group for crosslinking, the polymer particles having an average particle diameter of 0.3 micrometers to 0.7 micrometers.

Binder having superior adhesive strength for secondary batteries

Disclosed is a binder for a secondary battery electrode including a copolymer of a hydrophilic monomer and a hydrophobic monomer, wherein, when a concentration of the copolymer is 5% in a solution based upon NMP as a solvent, a viscosity of the solution including the copolymer is 800 cP to 10000 cP. By using the binder, stability of an electrode is fundamentally improved from an electrode preparation process and, as such, a secondary battery having excellent lifespan characteristics is provided.

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Daejeon, South Korea

Eun Joo Park