Nippon Chemi-con Corporation

Tayca Corporation

Satoru Tsumeda

Shuichi Ishimoto

Katsuhiko Naoi

Kenji Tamamitsu

Wako Naoi

Yoshihiro Minato

Kazuma Okura

Hirotaka Hanawa

Kazunori Takaki

Ryosuke Sugihara

Tomoya Sasaki

Daisuke Horii

Keiichi Watanabe

Keita Yajima

Shotaro Kon

Yoshiki Chikyu

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

A hybrid capacitor with further increased energy density, and a manufacturing method thereof are provided. This hybrid capacitor is configured from a positive electrode which is a polarizable electrode that has double-layer capacitance, and a negative electrode which has a negative electrode active material which can occlude and release lithium ions and which is formed from metal compound particles having a three-dimensional network structure, wherein, as an electrolyte, the electrolytic solution contains lithium salts in a molar concentration greater than or equal to 1.6 M.

Hybrid capacitor and manufacturing method thereof

A hybrid capacitor is provided which, while improving utilization ratio of the negative electrode active substance, achieves a low DC internal resistance. This hybrid capacitor is provided with a positive electrode having a layer of a positive electrode active substance having double-layer capacitance, and a negative electrode which has a negative electrode active substance layer that can occlude and release lithium ions and that is formed from metal compound particles having a three-dimensional network structure. The 100% discharge capacity of the metal compound particles having the three-dimensional network structure is 1.25-5.0 times the 100% discharge capacity of the positive electrode active substance.

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

Electrode foil for capacitor

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 are an electrode formed by mixing carbon powder and a fibrous carbon, wherein influence of a resin-based binder or the like and an conductivity promoting material or the like is eliminated to have low electric resistance and an excellent property of capacitance; an electric double-layer capacitor using the electrodes; and a manufacturing method of the electrode. Provided is a dispersion step in which the carbon powder with a particle size of less than 100 nm and the fibrous carbon are dispersed into a solvent. The dispersion step is to allow jets of the solution to collide with each other or to apply shear stress and centrifugal force to the solution, thereby dispersing the carbon powder and the fibrous carbon. Furthermore, the method comprises the sheet electrode forming step in which the solution subjected to the dispersion step is filtered to obtain the carbon powder/fibrous carbon sheet.

Electrode, electric double-layer capacitor using the same, and manufacturing method of the electrode

Provided is an electrochemical capacitor which has low DC internal resistance, and which minimizes increase in the DC internal resistance due to a high temperature experience. The electrochemical capacitor is provided with a positive electrode having a positive electrode active material layer containing activated carbon, a negative electrode having a negative electrode active material layer containing a spinel-type lithium titanate, and a separator holding a non-aqueous electrolytic solution containing a lithium salt between the positive electrode active material layer and the negative electrode active material layer, a 100% discharge capacity of lithium titanate being set to within a range of 2.2 to 7.0 times a 100% discharge capacity of activated carbon. During charging and discharging of the electrochemical capacitor, only the area near the surfaces of lithium titanate particles are utilized, lowering the DCIR and improving the stability of the DCIR.

Growing community of inventors

Tokyo, Japan

Satoru Tsumeda