Daikin Industries, Ltd.

Takashi Iguchi

Takahiro Kitahara

Manabu Fujisawa

Takuji Ishikawa

Kazuya Asano

Toshiki Ichisaka

Kazunobu Uchida

Chihiro Shinoda

Tomoyuki Fukatani

Norimasa Uesugi

Kazuki Hosoda

Kenji Ichikawa

Ryouichi Yano

Tomoyuki Goto

Kanako Arai

A binder for a secondary battery containing a fluorine-containing polymer (A) and polyvinylidene fluoride (B). The fluorine-containing polymer (A) contains a polymerized unit based on vinylidene fluoride, a polymerized unit based on tetrafluoroethylene, and a polymerized unit based on a monomer (2-2) represented by the following formula (2-2): wherein R, R, and Rare each independently a hydrogen atom or a C1-C8 hydrocarbon group; Ris a C1-C8 hydrocarbon group; and Yis an inorganic cation or an organic cation. Also disclosed is an electrode mixture and an electrode for a secondary battery including the binder, and a secondary battery including the electrode.

Binder for secondary battery, electrode mixture for secondary battery, electrode for secondary battery and secondary battery

A secondary battery separator including a porous substrate and a porous film firmly bonded to each other, the porous film being disposed on or above the porous substrate. The porous film contains a fluorine-containing polymer that contains a polymerized unit based on vinylidene fluoride, a polymerized unit based on tetrafluoroethylene, and a polymerized unit based on a monomer represented by the following formula (2-2):RRC&#x2550;CRRCOY&#x2003;&#x2003;(2-2)wherein R, R, and Rare each independently a hydrogen atom or a C1-C8 hydrocarbon group; Ris a C1-C8 hydrocarbon group; and Yis an inorganic cation and/or an organic cation. Also disclosed is a secondary battery including the secondary battery separator; a positive electrode; a negative electrode; and a non-aqueous electrolyte solution.

Secondary battery separator including porous film having fluorine-containing polymer of vinylidene fluoride, tetrafluoroethylene, and vinyl carboxylic acid or salt and secondary battery including the same

A binder and an electrode mixture for a secondary battery. The binder contains a fluorine-containing polymer containing a polymerized unit based on vinylidene fluoride, a polymerized unit based on tetrafluoroethylene, and a polymerized unit based on a monomer (2-2) represented by the following formula (2-2):RRC&#x2550;CRRCOY&#x2003;&#x2003;(2-2)wherein R, R, and Rare each independently a hydrogen atom or a C1-C8 hydrocarbon group; Ris a C1-C8 hydrocarbon group; and Yis an inorganic cation and/or an organic cation.

Binder for secondary batteries and electrode mixture for secondary batteries

The present invention aims to provide an electrode mixture which shows little change in viscosity even after 24 hours from the preparation of the mixture and enables production of an electrode having a high electrode density and excellent flexibility and is capable of giving excellent electric properties to the resulting cell. The present invention relates to an electrode mixture including a powdery electrode material; a binder; and an organic solvent, the binder including polyvinylidene fluoride and a fluorine-containing polymer including a polymer unit based on vinylidene fluoride and a polymer unit based on tetrafluoroethylene, the fluorine-containing polymer including the polymer unit based on vinylidene fluoride in an amount of 80.0 to 90.0 mol % based on all the polymer units, the polyvinylidene fluoride having a number average molecular weight of 150,000 to 1,400,000.

Electrode mixture

The present invention aims to provide an electrode mixture which shows little change in viscosity even after 24 hours from the preparation of the mixture and enables production of an electrode having a high electrode density and excellent flexibility and is capable of giving excellent electric properties to the resulting cell. The present invention relates to an electrode mixture including a powdery electrode material; a binder; and an organic solvent, the binder including a fluorine-containing polymer including a polymer unit based on vinylidene fluoride and a polymer unit based on tetrafluoroethylene, the fluorine-containing polymer including the polymer unit based on vinylidene fluoride in an amount of 80.0 to 89.0 mol % based on all the polymer units, and the organic solvent being N-methyl-2-pyrolidone and/or N,N-dimethylacetamide.

A binder, including a fluoropolymer, the fluoropolymer including a polymerization unit based on vinylidene fluoride and a polymerization unit based on a monomer having an amide group represented by &#x2014;CO&#x2014;NRR' (R and R&#x2032; are the same as or different from each other and each represent a hydrogen atom or an alkyl group optionally having a substituent group) or an amide bond represented by &#x2014;CO&#x2014;NR&#x2033;&#x2014; (R&#x2033; represents a hydrogen atom, an alkyl group optionally having a substituent group, or a phenyl group optionally having a substituent group) and having a solution viscosity of 10 to 20,000 mPa&#xb7;s. Also disclosed is a positive electrode mixture and a negative electrode mixture containing the binder, a positive electrode, a negative electrode and a lithium ion secondary cell.

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Settsu, Japan

Takashi Iguchi