Kureha Corporation

Emi Sugawara

Yuki Sakai

Tamito Igarashi

Shintarou Kamata

Shintarou Mutou

Keisuke Watanabe

Hiroshi Sakabe

Yuuki Sakai

Provided is a binder composition that exhibits sufficient adhesion and that achieves the excellent dispersibility of a conductive auxiliary agent. The binder composition according to an embodiment of the present invention is a binder composition containing a vinylidene fluoride copolymer composition containing vinylidene fluoride and an acrylic monomer; the acrylic monomer being at least one type selected from acrylic acid and methacrylic acid; and a ratio (Mn2/Mn1) of a number average molecular weight of the vinylidene fluoride copolymer composition after being adsorbed onto alumina (Mn2) to a number average molecular weight of the vinylidene fluoride copolymer composition before being adsorbed onto alumina (Mn1) being less than 2.

Binder composition, electrode mixture, electrode, and non-aqueous electrolyte secondary battery

A binder composition that exhibits sufficient adhesion and that achieves the excellent dispersibility of a conductive additive is provided. The binder composition according to an embodiment of the present invention is a binder composition including a vinylidene fluoride copolymer composition containing vinylidene fluoride and a monomer having an acidic functional group; and a ratio (Mn2/Mn1) of a number average molecular weight of the vinylidene fluoride copolymer composition after being adsorbed onto alumina (Mn2) to a number average molecular weight of the vinylidene fluoride copolymer composition before being adsorbed onto alumina (Mn1) being less than 1.

Binder composition, electrode mixture, electrode, non-aqueous electrolyte secondary battery, and production method of binder composition

In an electrode structural body, a coated film is obtained by applying an electrode mixture including an electrode active material, a first fluorine based polymer, and a solvent and drying the mixture, then formed on the surface of a current collector, the first fluorine based polymer has one or more side chains represented by the following Formula (1), and the coated film is subjected to heat treatment.&#x2014;X&#x2014;COOH&#x2003;&#x2003;(1) (In Formula (1), X is an atomic group having a molecular weight of less than 500, the main chain of which is made up of 1 to 20 atoms).

Electrode structural body and production method thereof

Provided are vinylidene fluoride copolymers exhibiting higher adhesion with respect to metal foils than do conventional vinylidene fluoride copolymers, and to provide uses of the vinylidene fluoride copolymers. The vinylidene fluoride copolymers are obtained by copolymerizing vinylidene fluoride with a compound represented by Formula (A). In Formula (A), R, Rand Rare each independently a hydrogen atom, a chlorine atom or an alkyl group; and X is an atomic group with a molecular weight of not more than 500 containing a heteroatom and having a main chain composed of 1 to 20 atoms, or is a heteroatom.

Vinylidene fluoride copolymers and uses of the copolymers

Provided is a vinylidene fluoride polymer powder exhibiting excellent solubility in aprotic polar solvents, and a vinylidene fluoride polymer solution obtained from the powder and an aprotic polar solvent. The vinylidene fluoride polymer powder has an NMP penetration rate of 12 to 100% as measured by an NMP penetration test.

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Tokyo, Japan

Emi Sugawara