Nissan Motor Company Limited

Kaneka Corporation

Akiko Waki

Yusuke Kato

Yoshio Shimoida

Takashi Kikuchi

Norihisa Waki

Masahiro Kojima

Satoshi Oku

Takashi Ito

Yasuyuki Tanaka

Shiho Inoue

Yuji Muroya

Masato Kusakabe

Shigeo Ibuka

Ryutaro Mukai

Hiroyuki Ogino

Gentaro Kano

Kazuki Miyatake

Keisuke Wakabayashi

Masami Yanagida

Ayumi Takaoka

Seiji Ishimoto

Tomohisa Matsuno

The present invention is intended to provide a nonaqueous electrolyte secondary battery that is suppressed in generation of a gas and a micro short circuit of a negative electrode, while exhibiting an excellent rate characteristic. The present invention relates to a nonaqueous electrolyte secondary battery having a sealed bodythat encloses a positive electrode, a nonaqueous electrolyte solution, a negative electrode, and a separatorformed of an electrically insulating material. The negative electrodeis formed by forming a negative electrode active material layer, which contains at least a negative electrode active materialand a negative electrode binder, on a current collector. The negative electrode active materialcontains a titanium compound as a main component, the titanium compound having a particle diameter of 0.1 &#x3bc;m or more and 20.0 &#x3bc;m or less. The negative electrode binderis an acid-modified PVdF obtained by introducing a carboxyl group into a polyvinylidene fluoride (PVdF). A negative electrode water content in the sealed bodyis 400 ppm or less.

Nonaqueous electrolyte secondary battery

A current collector for a battery includes: a layer () formed from an electrically conductive material and at least one of (a) a polymer compound having an alicyclic structure, (b) a saturated hydrocarbon polymer compound having a hydroxyl group, (c) a phenoxy resin and an epoxy resin, and (d) an amine having an amine equivalent of 120 g/eq or less and an epoxy resin; a layer () which is formed on at least one surface of the layer (); and a layer () formed from an electrically conductive material. The current collector for a battery has stability to an equilibrium potential environment in a negative electrode, a low electric resistance, a blocking property to solvent in electrolytic solution, and a blocking property to a component in an electrolyte. In addition, the current collector for a battery has a high capacity retention rate, and battery durability is improved.

Current collector for battery and battery using same

A conductive film includes a layer 1 formed by a conductive material 1 that includes a polymer material 1 containing any of (1) an amine and an epoxy resin (where the epoxy resin and the amine are mixed in a ratio of 1.0 or more in terms of the ratio of the number of active hydrogen atoms in the amine with respect to the number of functional groups in the epoxy resin), (2) a phenoxy resin and an epoxy resin, (3) a saturated hydrocarbon polymer having a hydroxyl group, and (4) a curable resin and an elastomer and conductive particles 1. The conductive film has excellent stability in an equilibrium potential environment in a negative electrode and low electric resistance per unit area in the thickness direction. A multilayer conductive film including the conductive film achieves excellent interlayer adhesion, and using them as a current collector enables the production of a battery satisfying both weight reduction and durability.

Conductive film, current collector using same, battery and bipolar battery

A multilayer conductive film includes a layerincluding a conductive material containing a polymer materialhaving an alicyclic structure and conductive particlesand a layerincluding a material having durability against positive electrode potential. The multilayer conductive film has stability in an equilibrium potential environment in a negative electrode and stability in an equilibrium potential environment in a positive electrode, has low electric resistance per unit area in the thickness direction, and has excellent barrier properties for a solvent of an electrolytic solution. A battery including a current collector employing the multilayer conductive film can achieve both weight reduction and durability.

Multilayer conductive film, current collector using same, battery and bipolar battery

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Settsu, Japan

Akiko Waki