Kao Corporation

Nissan Motor Company Limited

Kao Soap Company, Ltd.

Yasuhisa Fukumoto

Kenichi Nishimura

Ryuichi Akagi

Noboru Moriyama

Takamitsu Saito

Kazuo Oki

Tamaki Miura

Kyoichi Watanabe

Mikio Kawai

Michitaka Sawada

Yoshihiro Hasebe

Yasushi Ito

Kenji Kodama

Taketo Kaneko

Genichi Nakamura

Mieko Kawai, Legal Representative

Makoto Furukawa

Takako Nakayama

The positive electrode active material sintered body for a battery of the present invention is a positive electrode active material sintered body for a battery satisfying the following requirements (I) to (VII): (I) fine particles in a positive electrode active material are sintered to constitute the sintered body; (II) a peak pore diameter which provides a maximum differential pore volume value in a pore diameter range of 0.01 to 10 &#x3bc;m in a pore distribution is 0.3 to 5 &#x3bc;m; (III) a total pore volume is 0.1 to 1 cc/g; (IV) an average particle diameter is not less than the peak pore diameter and not more than 20 &#x3bc;m; (V) any peak, which provides a differential pore volume value of not less than 10% of the maximum differential pore volume value, is not present on a smaller pore diameter side than the peak pore diameter in the pore distribution; (VI) a BET specific surface area is 1 to 6 m/g; and (VII) a full width at half maximum of a strongest X-ray diffraction peak is 0.13 to 0.2.

Positive electrode active material sintered body for battery

It is an object of the present invention to provide a method for producing a positive electrode active material for a battery, which can realize easy regulation of pore size in porosity formation of a positive electrode active material and is less likely to undergo hindrance of ion conduction caused by residues and, thus, can realize excellent high-rate discharge characteristics, and a method for producing a composition for a battery using the positive electrode active material for the battery. The method for producing a positive electrode active material for a battery of the present invention is a method for producing a positive electrode active material for a battery, including: a step 1 of firing a mixture of a raw material for the positive electrode active material and carbon particles to remove the carbon particles; and a step 2 of milling and classifying a fired body obtained in the step 1.

Method for producing positive electrode active material for battery

The present invention provides a method for producing a composite material for positive electrodes of lithium batteries which is particularly excellent in high-rate discharge characteristics. The method for producing a composite material for positive electrodes of lithium batteries, contains: a dispersing step of dispersing at least the positive electrode active material and the conductive material 1 in a solvent to be in a forcibly dispersed state; and a composite particle-forming step of obtaining composite particles containing the positive electrode active material and the conductive material 1 by a process for agglutinating the conductive material 1 together with the positive electrode active material in the solvent or by a process for removing the solvent.

Method for producing composite material for positive electrode of lithium battery

The present invention provides a composite positive electrode material for a lithium ion battery, which is particularly excellent in high-rate discharge characteristics in a battery, and also provides a slurry, positive electrode and battery using the composite positive electrode material. The composite positive electrode material for a lithium ion battery contains: a positive electrode active material (a); a conductive material (b) having a primary particle diameter of 10 to 100 nm and/or a fibrous conductive material (c) having a fiber diameter of 1 nm to 1 &#x3bc;m; and a conductive material (d) having an aspect ratio of 2 to 50.

Composite positive electrode material for lithium ion battery and battery using the same

Porous particulate and cosmetic

A polymaleate having an average molecular weight of 300 to 5000 is obtained by polymerizing a monoalkali metal maleate or monoammonium maleate at 80.degree. to 180.degree. C. in the presence of a polymerization initiator in an aqueous solvent.

Process for producing polymaleate

A copolymer of maleic acid (MA) and (meth)acrylic acid (AA), or a salt thereof, wherein the molar ratio (MA/AA) .gamma. of the constituent monomers is 1.15 to 2.7, the average molecular weight MW is 1000 to 8000, and (.gamma.).times.(MW) is at least 3000.

Maleic acid/(meth)acrylic acid copolymer

A copolymer of maleic acid (MA) and (meth)acrylic acid (AA), or a salt thereof, wherein the molar ratio (MA/AA) .gamma. of the constituent monomers is 1.15 to 2.7, the average molecular weight MW is 1000 to 8000, and (.gamma.).times.(MW) is at least 3000. The copolymer is useful as a calcium ion capturing agent, in a process for treating water to inhibit formation of scale surfaces contacted by the water.

Maleic acid/(meth)acrylic acid copolymers useful as calcium ion

Growing community of inventors

Wakayama, Japan

Yasuhisa Fukumoto