Nippon Chemi-con Corporation

Yazaki Corporation

Tokyo University of Agriculture and Technology

Nec Corporation

Aoi Electronics Co., Ltd.

Katsuhiko Naoi

Wako Naoi

Shuichi Ishimoto

Kenji Tamamitsu

Yoshihiro Minato

Satoshi Kubota

Satoru Tsumeda

Yasuhiro Suzuki

Akihiko Torikoshi

Hiroshi Iizuka

Sekihiro Takeda

Noriyuki Miyamoto

Masashi Otsuka

Masaki Koike

Shunzo Suematsu

Hirotaka Hanawa

Kenichi Kawase

Toshihiko Nishiyama

Koji Sakata

Gaku Harada

Mitsuhiro Mori

Shinako Okada

Yoshinori Inoue

Junko Kurihara

Daisuke Horii

Takitaro Yamaguchi

Daisuke Yonekura

Syuichi Ishimoto

Kenji Machida

Ari Manago

Shunzou Suematsu

Michiko Komiyama

Yasushi Oura

Nobuhiro Ogihara

An objective of the present disclosure is to provide a method of producing metal compound particle group for an electricity storage device electrode that has an improved rate characteristic, the metal compound particle group, and an electrode formed of the metal compound particle group. The method of producing metal compound particle group applied for an electrode of an electricity storage device, the method includes a step of combining a precursor of metal compound particle with a carbon source to obtain a first composite material, a step of producing the metal compound particle by heat processing the first composite material under a non-oxidizing atmosphere to obtain a second composite material having the metal compound particle combined with carbon, and a step of eliminating carbon by heat processing the second composite material under an oxygen atmosphere to obtain the metal compound particle group having the metal compound particle coupled in a three-dimensional mesh structure.

Method of producing metal compound particle group, metal compound particle group, and electricity storage device electrode containing metal compound particle group

Provided is an electrode which gives an electric storage device that has high energy density and good cycle life. This electrode for an electric storage device is characterized by having an active material layer that contains: an electrode active material particle; and a paste-like conductive carbon that is derived from an oxidized carbon obtained by giving an oxidizing treatment to a carbon raw material with an inner vacancy and covers a surface of the electrode active material particle. The paste-like conductive carbon derived from the oxidized carbon is densely filled not only into a gap that is formed between the electrode active material particles adjacent to each other but also into a pore that exists on the surface of the active material particle, so that the electrode density is increased, thereby improving the energy density of the electric storage device. In addition, since the paste-like conductive carbon suppresses dissolution of the active material, the cycle characteristics of the electric storage device are improved.

Electrode, method for producing said electrode, electricity storage device provided with said electrode, and conductive carbon mixture for electricity storage device electrode

Provided is conductive carbon which gives an electric storage device having a high energy density. This conductive carbon is characterized in having a hydrophilic solid phase component, where the ratio of the peak area of an amorphous component band in the vicinity of 1510 cmagainst the peak area in a range from 980 to 1780 cmin a Raman spectrum of the hydrophilic solid phase component is within a range of 13 to 19%. When performing a rolling treatment on an active layer including an active particle and this conductive carbon formed on a current collector during manufacture of an electrode of an electric storage device, the pressure resulting from the rolling treatment causes this conductive carbon to spread in a paste-like form and increase in density while covering the surface of the active particles, the conductive carbon being pressed into gaps formed between adjacent active particles and filling the gaps. As a result, the amount of active material per unit volume in the electrode obtained after the rolling treatment increases, and the electrode density increases.

Electroconductive carbon, electrode material containing said carbon, electrode using said electrode material, and power storage device provided with said electrode

Provided is conductive carbon that gives an electrical storage device having a high energy density. This conductive carbon includes a hydrophilic part, and the contained amount of the hydrophilic part is 10 mass % or more of the entire conductive carbon. When performing a rolling treatment on an active material layer including an active material particle and this conductive carbon formed on a current collector during manufacture of an electrode of an electric storage device, the pressure resulting from the rolling treatment causes this conductive carbon to spread in a paste-like form and increase in density. The active material particles approach each other, and the conductive carbon is pressed into gaps formed between adjacent active material particles, filling the gaps. As a result, the amount of active material per unit volume in the electrode obtained after the rolling treatment increases, and the electrode density increases.

Conductive carbon, electrode material including said conductive carbon, and electrode using said electrode material

Provided are novel titanium oxide particles, production method thereof, and applications which do not need a conductive aid or minimize the conductive aid. Novel titanium oxide particlesemploy a three-dimensional network structure in which multiple crystallitesare coupled in sequence, and a magneli phaseis formed on the surface of the crystallites. The crystallitesare oriented at random, coupled with each other via pinacoid or end surface, and laminated as the three-dimensional network structure. A large number of spacesin nano size is present in the titanium oxide particles, a grain boundary of the bonding interface is eliminated between the crystallites, while a large number of pores is present.

Titanium oxide particles, titanium oxide particle production method, power storage device electrode including titanium oxide particles, and power storage device provided with electrode including titanium oxide particles

Provided are novel titanium oxide crystalline body and applications which do not need a conductive aid or minimize the conductive aid. A novel titanium oxide crystalline bodyhas a magneli phasea on a part of a surface. A titanium oxide forming a crystalline bodyis titanium oxide represented by the general formula that is TiO, and a titanium oxide compound represented by the general or that is MTiO. M indicates a metal. The magneli phasea is a titanium oxide represented by the general formula that is TiO(where 3&#x2264;n&#x2264;10). This titanium oxide crystalline bodyalso has the characteristics of the magneli phasea without deteriorating the characteristics of base material that is the titanium oxide.

Titanium oxide crystal body and power storage device electrode including titanium oxide crystalline body

Provided is an electrode material which leads to a lithium ion secondary battery that has high energy density. An electrode material for a lithium ion secondary battery of the present invention is characterized by containing: a coarse particle of a first active material that is able to act as a positive electrode active material or a negative electrode active material of a lithium ion secondary battery; and a particle of a composite composed of conductive carbon and a second active material attached to the conductive carbon that is able to act as an active material of the same electrode as the first active material. This electrode material for a lithium ion secondary battery is also characterized in that: a diameter of the coarse particle of the first active material is larger than a diameter of the particle of the composite; and the particle of the composite is filled in a gap formed between the particles of the first active material. A conductive agent can be additionally contained in the gap.

Electrode material for lithium ion secondary batteries, method for producing electrode material for lithium ion secondary batteries, and lithium ion secondary battery

A composite powder in which highly dispersed metal oxide nanoparticle precursors are supported on carbon is rapidly heated under nitrogen atmosphere, crystallization of metal oxide is allowed to progress, and highly dispersed metal oxide nanoparticles are supported by carbon. The metal oxide nanoparticle precursors and carbon nanoparticles supporting said precursors are prepared by a mechanochemical reaction that applies sheer stress and centrifugal force to a reactant in a rotating reactor. The rapid heating treatment in said nitrogen atmosphere is desirably heating to 400&#xb0; C. to 1000&#xb0; C. By further crushing the heated composite, its aggregation is eliminated and the dispersity of metal oxide nanoparticles is made more uniform. Examples of a metal oxide that can be used are manganese oxide, lithium iron phosphate, and lithium titanate. Carbons that can be used are carbon nanofiber and Ketjen Black.

Composite of metal oxide nanoparticles and carbon, method of production thereof, electrode and electrochemical element employing said composite

Provided is conductive carbon which gives an electric storage device having a high energy density. This conductive carbon is characterized in having a hydrophilic solid phase component, where a crystallite size La that does not include a twist in a graphene surface direction and a crystallite size Leq that includes a twist in a graphene surface direction, which are calculated from a Raman spectrum of the hydrophilic solid phase component, satisfy the following relationships: 1.3 nm&#x2266;La&#x2266;1.5 nm, and 1.5 nm&#x2266;Leq&#x2266;2.3 nm, and 1.0&#x2266;Leq/La&#x2266;1.55. When performing a rolling treatment on an active layer including an active particle and this conductive carbon formed on a current collector during manufacture of an electrode of an electric storage device, the pressure resulting from the rolling treatment causes this conductive carbon to spread in a paste-like form and increase in density while covering the surface of the active particles, the conductive carbon being pressed into gaps formed between adjacent active particles and filling the gaps. As a result, the amount of active material per unit volume in the electrode obtained after the rolling treatment increases, and the electrode density increases.

Conductive carbon, electrode material including said carbon, electrode in which said electrode material is used, and electric storage device provided with said electrode

Provided is a method whereby metal oxide nanoparticles having evenness of size are efficiently and highly dispersedly adhered to conductive carbon powder. This method comprises: a preparation step in which a reaction solution containing water, a compound with a transition metal selected from the group consisting of Mn, Fe, Co, and Ni, and conductive carbon powder and having a pH in the range of 9 to 11 is introduced into a rotatable reactor; a supporting step in which the reactor is rotated to apply shear stress and centrifugal force to the reaction solution, thereby yielding a core of a hydroxide of the transition metal and dispersing the thus-yielded core of a hydroxide of the transition metal and the conductive carbon powder and simultaneously supporting the hydroxide of the transition metal by the conductive carbon powder; and a heat treatment step in which the conductive carbon powder loaded with the hydroxide of the transition metal is heated to thereby convert the hydroxide supported by the conductive carbon powder into an oxide nanoparticle.

Process for producing composite material of metal oxide with conductive carbon

A method for manufacturing composites in which the nanosize of a carbon material and a metal compound can be maintained as the final product is realized to provide a superior electrode material. A treatment of increasing the functional groups possessed by a carbon material is performed in advance. Then, a metal compound precursor is supported on a carbon material by separately performing a treatment of adsorbing one of source materials of the metal compound to the functional groups of the carbon material having increased functional groups and a treatment of reacting the adsorbed source material of the metal compound with the rest of the source materials on the carbon material to produce a metal compound precursor on the carbon material. Finally, a lithium source is introduced and calcined.

Electrode material and manufacturing method thereof

Disclosed is a negative electrode active material which is capable of occluding and releasing lithium, and has high reversible capacity and reduced initial irreversible capacity. This negative electrode active material includes a granulated substance, in which a composite containing nanosize conductive carbon powder and tin oxide powder contacting the surface of the conductive carbon powder in a highly dispersed state and an aggregate selected from the group consisting of graphite and nongraphitizable carbon are aggregated. The electrochemical decomposition of electrolytic solution is suppressed due to a reduction in the area where the carbon material in the granulated substance and the electrolytic solution are in contact, resulting in a significant reduction in the initial irreversible capacity of the negative electrode active material.

Negative electrode active material having nanosize tin oxide particle disperded on surface of nanosize conductive carbon powder, method for producing the same, and lithium ion secondary battery using the same

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Tokyo, Japan

Katsuhiko Naoi