Nippon Chemi-Con Corporation

Tayca Corporation

Shuichi Ishimoto

Katsuhiko Naoi

Wako Naoi

Kenji Tamamitsu

Satoshi Kubota

Yoshihiro Minato

Satoru Tsumeda

Masaki Koike

Hirotaka Hanawa

Ryosuke Sugihara

Nobuhiro Ogihara

Noriyuki Miyamoto

Sekihiro Takeda

Masashi Otsuka

Kazunori Takaki

Kazuma Okura

Daisuke Horii

Keiichi Watanabe

Daisuke Yonekura

Yasuyoshi Shiraishi

A storage device having excellent cycle lifetime, an electrode used in this storage device, and a production method of the electrode are provided. An electrode comprising an active material and a conductive carbon including oxidized carbon. A surface of the active material is covered by the conductive carbon. A Raman spectrum of the active material covered by the conductive carbon includes a peak intensity (a) derived from the active material and a peak intensity (b) of D-band derived from the conductive carbon. A peak intensity ratio (b)/(a) between the peak intensity (a) and the peak intensity (b) is 0.25 or more.

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

Provided is a conductive carbon mixture which is to be used together with an electrode active material in manufacturing an electrode of an electricity storage device and enables the manufacture of the electricity storage device having a good cycle life. The conductive carbon mixture for manufacturing an electrode of an electricity storage device comprises an oxidized carbon having electrical conductivity and a different conductive carbon which is different from the oxidized carbon, wherein the oxidized carbon covers the surface of the different conductive carbon. The conductive carbon mixture is characterized in that the ratio of the peak intensity of the 2D band to the peak intensity of the D band in a Raman spectrum of the conductive carbon mixture is 55% or less relative to the ratio of the peak intensity of the 2D band to the peak intensity of the D band in a Raman spectrum of the different conductive carbon. This conductive carbon mixture covers the surface of the electrode active material in a particularly good manner and thus prolongs the cycle life of the electricity storage device.

Conductive carbon mixture and method for manufacturing same, electrode using conductive carbon mixture and method for manufacturing same, and electricity storage device provided with electrode

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

There is demand for a power storage device composition that: compared to past lithium compounds, can suppress development of conductivity caused by blue discoloration (reduction), even when used in a reducing atmosphere; and can inhibit the generation of gases, such as carbon dioxide gas, hydrogen gas, and fluoride gas, that has been a problem in past power storage devices during use and with aging. This power storage device composition is characterized by including, as a principal component, LiTiOthat has an x-ray diffraction pattern for which the intensity ratio (A/B) of the peak intensity (A) at a diffraction angle of 2&#x3b8;=18.4&#xb1;0.1&#xb0; and the peak intensity (B) at a diffraction angle of 2&#x3b8;=43.7&#xb1;0.1&#xb0; is at least 1.10.

Power storage device composition, power storage device separator using power storage device composition, and power storage device

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 is a hybrid capacitor with an excellent long-term stability. A hybrid capacitor includes a positive electrodeincluding a positive-electrode active material layercontaining a carbon material employing a porous structure or a fibrous structure with an electric double layer capacity, and a negative electrodeincluding a negative-electrode active materialcontaining a material capable of adsorbing and releasing lithium ions. A lithium compound that traps protons is disposed between the positive-electrode active material layerand the negative-electrode active material layer. This hybrid capacitor further includes a separatordisposed between the positive-electrode active material layerand the negative-electrode active material layer, and the separator contains the lithium compound.

Hybrid capacitor and separator for hybrid capacitors

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.

Growing community of inventors

Tokyo, Japan

Shuichi Ishimoto