Mitsubishi Chemical Corporation

Kaoru Terada

Naoto Kijima

Hiromu Watanabe

Hiroshi Wada

Keiichi Seki

Motoyuki Shigeiwa

Masumi Itou

Kenji Shizuka

Kenji Okahara

Tomohiro Kusano

Hiroyuki Imura

A lithium transition metal-based compound powder for a lithium secondary battery positive electrode material that can achieve both improvements of load characteristics such as rate and output characteristics and a higher density is a lithium transition metal-based compound powder containing, as a main component, a lithium transition metal-based compound that has a function of allowing elimination and insertion of lithium ions, and including a crystal structure belonging to a layer structure, wherein primary particles are aggregated to form secondary particles, the ratio A/B of a median diameter A of the secondary particles to an average diameter (average primary particle diameter B) is in the range of 8 to 100, and 0.01&#x2266;FWHM(110)&#x2266;0.5 where FWHM(110) is the half width of a (110) diffraction peak present near a diffraction angle 2&#x3b8; of 64.5&#xb0; in a powder X-ray diffraction analysis using a CuK&#x3b1; line.

Lithium transition metal-based compound powder, method for manufacturing the same, spray-dried substance serving as firing precursor thereof, and lithium secondary battery positive electrode and lithium secondary battery using the same

A nitride phosphor contains europium as an activating element and strontium, or strontium and calcium, as divalent metal elements. The phosphor further includes aluminum and silicon. Of the europium in the phosphor, at least 85% is in the form of Eu. The phosphor has a peak emission wavelength of from 590 nm to 650 nm. A phosphorescent body that includes the phosphor can be suitable for converting a wavelength of at least a portion of light emitted from an excitation light source in a light-emitting device.

Europium- and strontium-based phosphor

There is provided a powder of a lithium transition-metal compound for a positive-electrode material in a lithium secondary battery, in which the use of the powder as that of a positive-electrode material in a lithium secondary battery achieves a good balance among improvement in battery performance, cost reduction, resistance to a higher voltage, and a higher level of safety. The powder of the lithium transition-metal compound for a positive-electrode material in a lithium secondary battery is characterized in that in a mercury intrusion curve obtained by mercury intrusion porosimetry, the amount of mercury intruded is in the range of 0.8 cm/g to 3 cm/g when the pressure is increased from 3.86 kPa to 413 MPa.

Lithium transition metal-based compound powder for positive electrode material in lithium rechargeable battery, method for manufacturing the powder, spray dried product of the powder, firing precursor of the powder, and positive electrode for lithium rechargeable battery and lithium rechargeable battery using the powder

The present invention relates to a phosphor comprising a nitride or an oxynitride, comprising an X-ray powder diffraction pattern comprising at least one Region having at least one peak with an intensity ratio I of 8% or less, the X-ray powder diffraction pattern measured in the 2&#x3b8; range from 10&#xb0; to 60&#xb0; using a CuK&#x3b1; line (1.54184 {acute over (&#x212b;)}), wherein the Region is the 2&#x3b8; range from 41.5&#xb0; to 47&#xb0;, the intensity of each peak is a value obtained after background correction, and the intensity ratio I is defined by the formula (I&#xd7;100)/I(%), where Irepresents the height of the most intense peak present in the 2&#x3b8; range from 34&#xb0; to 37&#xb0; and Irepresents the height of each peak.

Alloy powder for raw material of inorganic functional material and phosphor

The present invention provides an alloy powder that is a material for producing inorganic functional materials such as phosphors, a phosphor with high brightness, and a method for producing the phosphor. An alloy powder for an inorganic functional material precursor contains at least one metal element and at least one activating element Mand has a weight-average median diameter Dof 5 &#x3bc;m to 40 &#x3bc;m. A method for producing a phosphor includes a step of heating an alloy, containing two or more metal elements for forming the phosphor, in a nitrogen-containing atmosphere.

Growing community of inventors

Ibaraki, Japan

Kaoru Terada