Toda Kogyo Corporation

Masayuki Uegami

Kenji Okinaka

Hideaki Sadamura

Kazumichi Koga

Kazutoshi Ishizaki

Tomoko Okita

Junichi Kawano

Koji Kakuya

Akihisa Kajiyama

Kazutoshi Matsumoto

Yasuhiko Fujii

Kohji Mori

Yasutaka Ota

Seiji Okazaki

Hiroaki Masukuni

Hirofumi Kawasaki

Akio Mishima

Shoichi Fujino

Minoru Yamasaki

Katsumi Yamashita

Tomohiro Honda

Toshiaki Hiramoto

Daisuke Morita

Manabu Matsumoto

Kunihiro Kouchi

Ryota Fujimoto

Andreas D Jazdanian

Soichi Yatagai

Soichi Yatagi

Kazushi Nishimoto

Katsuhiro Fujita

Masashi Kobino

Hiroki Kamon

Takahisa Nishio

Akino Ito

Kouta Sato

This invention provides lithium manganate which has a high output and is excellent in high-temperature stability. This invention relates to lithium manganate particles which are produced by mixing a lithium compound, a manganese compound, a Y compound and an A compound and then calcining the resulting mixture, and have a composition represented by the following chemical formula 1 and an average secondary particle diameter (D) of 1 to 15 &#x3bc;m, in which Y is at least one element selected from the group consisting of Al and Mg; A is a sintering aid element having a melting point of not higher than 850&#xb0; C.; x and y satisfy 0.03&#x2264;x&#x2264;0.15 and 0&#x2264;y&#x2264;0.20, respectively; z is in the range of 0 to 2.5 mol % based on Mn, wherein the lithium manganate particles have a sulfur content of not more than 100 ppm.LiMnYOA&#x2003;&#x2003;(Chemical Formula 1)

Lithium manganate particles for non-aqueous electrolyte secondary battery, process for producing the same, and nonaqueous electrolyte secondary battery

The present invention relates to positive electrode active substance particles for lithium ion batteries, comprising lithium manganate particles comprising Li and Mn as main components and having a cubic spinel structure (Fd-3m), wherein primary particles of the positive electrode active substance have a dodecahedral or higher-polyhedral shape in which none of crystal planes equivalent to the (111) plane are located adjacent to each other, and flat crystal planes are crossed with each other to form a clear ridge, and an average primary particle diameter of the primary particles is not less than 1 &#x3bc;m and not more than 20 &#x3bc;m. The positive electrode active substance particles according to the present invention are excellent in packing property, load characteristics and high-temperature stability.

Positive electrode active material for secondary batteries with nonaqueous electrolytic solution, process for the production of the active material, and secondary batteries with nonaqueous electrolytic solution

The present invention relates to lithium manganate particles having a primary particle diameter of not less than 1 &#x3bc;m and an average particle diameter (D) of not less than 2 &#x3bc;m and not more than 10 &#x3bc;m as measured by a particle size distribution meter, and forming particles having substantially a single phase, which have a composition represented by the following chemical formula:LiMnY1O+Y2

Lithium manganate particles for non-aqueous electrolyte secondary battery, process for producing the same, and non-aqueous electrolyte secondary battery

According to the present invention, there is provided a process for producing lithium manganate particles having a high output and an excellent high-temperature stability. The present invention relates to a process for producing lithium manganate particles comprising the steps of mixing a lithium compound, a manganese compound and a boron compound with each other; and calcining the resulting mixture in a temperature range of 800 to 1050&#xb0; C., wherein an average particle diameter (D) of the boron compound is not more than 15 times an average particle diameter (D) of the manganese compound, and wherein the lithium manganate particles have a composition represented by the following chemical formula:LiMnY1O+Bin which Y1 is at least one element selected from the group consisting of Ni, Co, Mg, Fe, Al, Cr and Ti, and x and y satisfy the conditions of 0.03&#x2266;x&#x2266;0.15 and 0&#x2266;y&#x2266;0.20, respectively.

Process for producing lithium manganate particles and non-aqueous electrolyte secondary battery

The present invention aims at providing lithium manganate having a high output and an excellent high-temperature stability. The above aim can be achieved by lithium manganate particles having a primary particle diameter of not less than 1 &#x3bc;m and an average particle diameter (D) of kinetic particles of not less than 1 &#x3bc;m and not more than 10 &#x3bc;m, which are substantially in the form of single crystal particles and have a composition represented by the following chemical formula: LiMnYOin which Y is at least one element selected from the group consisting of Al, Mg and Co; x and y satisfy 0.03&#x2266;x&#x2266;0.15 and 0.05&#x2266;y&#x2266;0.20, respectively, wherein the Y element is uniformly dispersed within the respective particles, and an intensity ratio of I(400)/I(111) thereof is not less than 33% and an intensity ratio of I(440)/I(111) thereof is not less than 16%.

Lithium manganate for non-aqueous electrolyte secondary battery, process for producing the same, and non-aqueous electrolyte secondary battery

The present invention relates to lithium manganate particles having a primary particle diameter of 1 to 8 &#x3bc;m and forming substantially single-phase particles, which have a composition represented by the following chemical formula:LiMnY1O+Y2in which Y1 is at least one element selected from the group consisting of Ni, Co, Mg, Fe, Al, Cr and Ti; Y2 is P and is present in an amount of 0.01 to 0.6 mol % based on Mn; and x and y satisfy 0.03&#x2266;x&#x2266;0.15 and 0.05&#x2266;y&#x2266;0.20, respectively, and

Iron composite particles for purifying soil or ground water, comprise &#x3b1;-Fe and magnetite, and having a ratio of a diffraction intensity Dof (110) plane of &#x3b1;-Fe to a sum of a diffraction intensity Dof (311) plane of magnetite and the diffraction intensity D(D/(D+D)) of 0.30 to 0.95 as measured from X-ray diffraction spectrum of the iron composite particles, an Al content of 0.10 to 1.50% by weight and an S content of 3500 to 7000 ppm; a process for producing the iron composite particles; a purifying agent containing the iron composite particles; a process for producing the purifying agent; and a method for purifying soil or ground water.

Iron composite particles for purifying soil or ground water, process for producing the same, purifying agent containing the same, process for producing the purifying agent and method for purifying soil or ground water

A purifying agent for purifying soil or ground water which comprises a water suspension containing iron composite particles comprising &#x3b1;-Fe and magnetite, and having an average particle diameter of 0.05 to 0.50 &#x3bc;m, an S content of 3500 to 10000 ppm and an Al content of 0.10 to 1.50% by weight, and polyaspartic acid or a salt thereof. The purifying agent is capable of decomposing aliphatic organohalogen compounds or aromatic organohalogen compounds contained in the soil or ground water in an efficient, continuous and economical manner.

Purifying agent for purifying soil or ground water, process for producing the same, and method for purifying soil or ground water using the same

Iron particles for purifying soil or ground water of the present invention comprise a mixed phase of &#x3b1;-Fe phase and FeOphase, and having a BET specific surface area of 5 to 60 m/g, an Fe content of not less than 75% by weight based on the weight of the iron particles and a sulfur content of not less than 1,000 ppm. The iron particles are capable of decomposing or insolubilizing harmful substances such as organohalogen compounds and/or heavy metals, cyanogen, etc. contained in the soil or ground water in efficient, continuous and economical manners.

Process for purifying contaminated soil or groundwater with iron particles

Iron particles for purifying contaminated soil or ground water

The present invention relates to spindle-shaped goethite particles having an average major axial diameter of 0.05 to 0.18 &mgr;m, spindle-shaped hematite particles having an average major axial diameter of 0.05 to 0.17 &mgr;m, spindle-shaped magnetic metal particles containing iron as a main component, which exhibit an adequate coercive force, good dispersibility, good oxidation stability and excellent coercive force distribution notwithstanding the average major axial diameter thereof is as small as 0.05 to 0.15 &mgr;m, and processes for producing the respective particles. Especially, the spindle-shaped magnetic metal particles containing iron as a main component, have an average major axial diameter of 0.05 to 0.15 &mgr;m, an aspect ratio of from 5:1 to 9:1, a size distribution (standard deviation/average major axial diameter) of not more than 0.30, a crystallite size D of 130 to 160 &angst;, a Co content of from 0.5 to less than 6 atm % based on whole Fe, an Al content of from more than 10 to less than 20 atm % based on whole Fe, a rare earth element content of from 1.5 to 5 atm % based on whole Fe, an atomic ratio of Al to Co of from more than 2 to 4, a coercive force of 111.4 to 143.2 kA/m, an oxidation stability of saturation magnetization (&Dgr;&sgr;s) of not more than 10%, and an ignition temperature of not less than 130&deg; C.

Spindle-shaped goethite particles, spindle-shaped hematite particles, spindle-shaped magnetic metal particles containing iron as main component and processes for producing the same

Secondary agglomerates of magnetic metal particles for magnetic recording, have a sodium content of not more than 20 ppm and a calcium content of not more than 40 ppm, an average particle diameter of 300 to 800 &mgr;m and an upper limit of particle diameters of 2,000 &mgr;m, and comprise magnetic metal primary particles having an average major axis diameter of 0.05 to 0.25 &mgr;m.

Secondary agglomerates of magnetic metal particles for magnetic recording and process for producing the same

Secondary agglomerates of magnetic metal particles containing primary particles having an average major axial diameter of 0.05 to 0.25 &mgr;m, said secondary agglomerates having an average particle diameter of 300 to 800 &mgr;m, an upper limit of particle diameter of 2,000 &mgr;m and a repose angle of 38 to 45&deg;. The secondary agglomerates exhibit not only excellent handing property due to high storage efficiency, high transport efficiency and good flowability thereof, but also excellent kneading property when kneaded with various binder resins and organic solvents in a kneader, and excellent dilution-dispersibility when diluted with an additional amount of the organic solvent, upon the production of coating-type magnetic recording media, so as to more improve a surface smoothness and squareness of a magnetic coating film obtained therefrom, and a process for producing such secondary agglomerates of magnetic metal particles for magnetic recording.

Spindle-shaped magnetic metal particles containing iron as main component and processes for producing the same

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Onoda, Japan

Masayuki Uegami