Denka Company Limited

Central Glass Company, Limited

Fdk Corporation

Jiangxi University of Science and Technology

Littelfuse Japan G.k.

Tyco Electronics Japan G.k.

Tatsuya Nagai

Shinichiro Osumi

Tetsuya Ito

Hiroshi Yokota

Hitoshi Kaneko

Yoko Horikoshi

Toru Arai

Akifumi Yao

Koji Izumi

Hiroyuki Oomori

Akira Yoda

Shoi Suzuki

Ayumu Tsukamoto

Takuya Narutomi

Daiki Ikeda

Sheng Wen Zhong

Jun Chen

Qian Zhang

Min Zeng

Takako Arai

A positive electrode composition for a lithium ion secondary battery includes an active material that can occlude and release lithium ions and a conductive material, wherein the active material is a lithium cobalt composite oxide; the conductive material is carbon black and carbon nanotubes; the carbon black has a BET specific surface area of 100 to 400 m/g and a DBP absorption amount of 210 to 400 ml/100 g; the carbon nanotubes have an average diameter of 20 nm or less, a BET specific surface area of 170 m/g or more, and an aspect ratio of 50 or more; and a carbon black content X (unit: % by mass) and a carbon nanotube content Y (unit: % by mass) in the positive electrode composition satisfy the following conditions (A) and (B): (A) 0.5≤(X+Y)≤2.0; (B) 0.80≤{X/(X+Y)}≤0.95.

Positive electrode composition for lithium ion secondary battery, positive electrode for lithium ion secondary battery, and lithium ion secondary battery

According to various aspects of the present invention, a positive electrode composition for a lithium-ion secondary battery includes an active material capable of inserting and extracting lithium ions, and a conductor, wherein the active material is a lithium-nickel-cobalt-manganese complex oxide; the conductor is a carbon black and carbon nanotubes; the carbon black has a BET specific surface area of 100 to 400 m/g, and a DBP absorption of 210 to 380 ml/100 g; and the carbon nanotubes have an average diameter of 7 to 15 nm.

Positive electrode composition for lithium ion secondary batteries, positive electrode for lithium ion secondary batteries, and lithium ion secondary battery

A composition for a positive electrode of a lithium ion secondary battery, the composition comprising:

Composition for lithium ion secondary battery positive electrode, lithium ion secondary battery positive electrode, and lithium ion secondary battery

To provide a carbon black for batteries capable of readily obtaining a positive electrode for batteries having excellent adhesiveness, and excellent output characteristics and the cycle characteristics. A carbon black for batteries, the carbon black having a BET specific surface area measured according to JIS K6217-2 C method of 100 m/g or larger, and a surface fluorine concentration X (unit: atom %) and a surface oxygen concentration Y (unit: atom %) measured by X-ray Photoelectron Spectroscopy (XPS) satisfying the following conditions (A) and (B),0.3&#x2264;&#x2264;4.0 and&#x2003;&#x2003;(A)0.1&#x2264;&#x2264;3.0.&#x2003;&#x2003;(B)

Carbon black for batteries, coating liquid for batteries, positive electrode for nonaqueous batteries and nonaqueous battery

A slurry including at least a carbon black and a dispersion medium, wherein a concentration of the carbon black in the slurry is 5% by mass or more and 25% by mass or less, and wherein in a volume-based frequency distribution of particle size of the carbon black measured by a laser diffraction/scattering method, provided that a volume concentration of carbon black with a particle size of 0.6 &#x3bc;m or more is x (%), a volume concentration of carbon black with a particle size of 0.3 &#x3bc;m or more and less than 0.6 &#x3bc;m is y (%), and a volume concentration of carbon black having a particle size of less than 0.3 &#x3bc;m is 100&#x2212;(x+y) (%), the slurry satisfies 10&#x2264;x&#x2264;70, 30&#x2264;y&#x2264;90, and 0&#x2264;100&#x2212;(x+y)&#x2264;30.

Slurry including carbon black, electrode paste, method for producing electrode, and method for producing secondary battery

Provided is a conductive composition for electrodes, the conductive composition having excellent electrical conductivity and dispersibility. Also provided are: a positive electrode for non-aqueous batteries, the positive electrode using the conductive composition and having low electrode plate resistance and excellent binding properties; and a non-aqueous battery having high energy density, high output characteristics, and high cycle characteristics. The conductive composition for electrodes contains a conductive material, an active material, a binder, and a dispersant, wherein the conductive material contains carbon black and a multi-walled carbon nanotube having a powder resistivity of 0.035 &#x3a9;&#xb7;cm or less as measured under a load of 9.8 MPa, and a median volumetric diameter D50 value, which is as a measure of dispersibility, in the range of 0.3-8 &#x3bc;m The positive electrode which is for non-aqueous batteries and has low electrode plate resistance and excellent binding properties; and the non-aqueous battery having high output characteristics and high cycle characteristics are obtained by using the conductive composition in which the content of the multi-walled carbon nanotube in the conductive material is 3-50 mass %.

Conductive composition for electrodes, and electrode and battery using same

An object of the present invention is to provide a carbon black for batteries having excellent dispersibility, electron conductivity and oxidation resistance. In addition, an object of the present invention is to provide a low-viscosity conductive composition for an electrode produced using the carbon black, and a low-resistance battery electrode and a battery having excellent high-output characteristics and cycle characteristics produced using the conductive composition. A carbon black for batteries having: BET specific surface area of 50 to 220 m/g; a crystallite diameter (La) of 30 to 42 &#x212b;; and a number of COdesorption molecules per unit surface area measured by a temperature-rising desorption gas analysis method (50&#xb0; C. to 1200&#xb0; C. of measurement temperature) of 8.0&#xd7;10to 15.0&#xd7;10molecules/mis excellent in dispersibility, electron conductivity and oxidation resistance. A conductive composition for a low-viscosity electrode produced using the carbon black, and a low-resistance battery electrode and a battery having excellent high-output characteristics and cycle characteristics produced using the conductive composition can be obtained.

Carbon black for batteries, conductive composition for electrodes, electrode for batteries, and battery

[Problem] To provide a conductive resin composition for electrodes which is excellent in dispersibility and oxidation resistance. To provide: an electrode composition employing the conductive resin composition for electrodes and having a low viscosity; an electrode employing the electrode composition and having a low electrode plate resistance; and a lithium ion battery having a high energy density, high output characteristics and a high cyclability. [Solution] A conductive resin composition for electrodes, comprising a dispersant, a conductive agent, and a binding material, wherein: the dispersant comprises a graft copolymer in which a monomer containing acrylonitrile as a main component is grafted onto polyvinyl alcohol; the average degree of polymerization of the polyvinyl alcohol is 300 to 3,000 and the degree of saponification of the same is 90 mol % to 100 mol %; and the polyvinyl alcohol content and the polyacrylonitrile content in the graft copolymer are, respectively, 10 mass % to 40 mass % and 90 mass % to 60 mass %.

Conductive resin composition for electrodes, electrode composition, electrode using same and lithium ion battery

A conductive composition for electrode is provided that is excellent in conductivity and dispersibility. Further, an electrode for lithium ion secondary battery with lower plate resistance and a lithium ion secondary battery excellent in rate characteristics are provided that use this conductive composition. A conductive composition for electrode, including: carbon nanofiber with a median diameter D50 value by volume from 0.1 to 8 pm; an active material; and a binder enables production of an electrode for lithium ion secondary battery with lower plate resistance and a lithium ion secondary battery excellent in rate characteristics.

Conductive composition for electrode, electrode using same, and lithium ion secondary battery

The present invention provides a heat suppressing alkaline storage battery including a positive electrode lead having a downsized portion that incorporates a PTC thermistor. A battery includes a positive electrode lead having a first lead half body, a second lead half body, and a PTC thermistor, the first and second lead half bodies overlap end portions formed in a portion where the first and second lead half bodies overlap with each other, the overlap end portions being larger than the PTC thermistor as viewed from a plane and being in contact with the PTC thermistor, the PTC thermistor is fitted in a fitting recessed portion formed in the overlap end portion of the first lead half body, and an exposed portion of the PTC thermistor is covered with a protective material.

Growing community of inventors

Tokyo, Japan

Tatsuya Nagai