Sony Corporation

Murata Manufacturing Co., Ltd.

Kazunari Motohashi

Yosuke Hosoya

Kazuaki Endoh

Satoshi Fujiki

Takumi Hiasa

Guohua Li

Takanori Sato

Seiichi Onodera

Naoki Hayashi

Yoshihiro Kudo

Hidetoshi Honda

Shinya Yoshida

Tetsuo Samoto

Takashi Kanou

Naoki Ikeda

Yusuke Morino

Tomoe Iwano

Satoshi Umezu

Daizo Shiga

Hirotaka Fukudome

Hironobu Tsuji

A secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution. A potential of the positive electrode, versus a lithium reference electrode, at a time of charging is higher than or equal to 4.50 V. The electrolytic solution includes a branched carboxylic acid ester compound.

Secondary battery

A lithium-ion secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution. The positive electrode includes a positive electrode active material. The electrolytic solution includes a cyclic sulfuric acid ester compound, a cyclic ether compound, and a chain alkyl dinitrile compound. A ratio of a weight (mg) of the cyclic sulfuric acid ester compound to a weight (g) of the positive electrode active material is from 0.01 to 2.

Lithium-ion secondary battery

A non-aqueous electrolyte secondary battery includes a positive electrode, a negative electrode, and a non-aqueous electrolytic solution including a predetermined cyano ester compound and a cyclic sulfuric acid ester.

Non-aqueous electrolytic solution and non-aqueous electrolyte secondary battery

A positive electrode contains a first active material and a second active material. The first active material and the second active material each contain a lithium composite oxide containing at least manganese (Mn), nickel (Ni), and cobalt (Co) as transition metals. The first active material has a particulate shape. An average porosity V1 in a particle of the first active material satisfies 10[%]&#x2264;V1&#x2264;30[%]. An average particle diameter D1 of the first active material satisfies 6 [&#x3bc;m]&#x2264;D1&#x2264;20 [&#x3bc;m]. The second active material has a particulate shape. An average porosity V2 in a particle of the second active material satisfies 0[%]&#x2264;V2&#x2264;10[%]. An average particle diameter D2 of the second active material satisfies 1 [&#x3bc;m]&#x2264;D2&#x2264;6 [&#x3bc;m].

Positive electrode, battery, battery pack, electronic device, electric vehicle, electricity storage device, and electric power system

A cathode active material is a lithium-rich lithium-containing compound having a bedded salt-type crystal structure. A product SD of a specific surface area S in square meters per gram and a crystallite diameter D in micrometer is equal to or more than about 1.4&#xd7;10cubic meters per gram.

Cathode active material, cathode, secondary battery, battery pack, electric vehicle, electric power storage system, electric power tool, and electronic apparatus

A cathode includes a lithium transition metal complex compound including lithium, one, or two or more transition metals, magnesium, and oxygen as constituent elements. In a standardized X-ray absorption spectrum of the lithium transition metal complex compound measured by an X-ray absorption spectroscopic method, a first absorption edge having absorption edge energy E1 in X-ray absorption intensity of about 0.5 exits in a range where X-ray energy is from about 1303 eV to about 1313 eV both inclusive, in a discharged state in which a discharge voltage is about 3.0 V, and a second absorption edge having absorption edge energy E2 in X-ray absorption intensity of about 0.5 exits, in a charged state in which a charge voltage V is from about 4.3 V to about 4.5 V both inclusive. The absorption edge energies E1 and E2 and the charge voltage V satisfy a relation of E2&#x2212;E1&#x2267;(V&#x2212;4.25)&#xd7;4.

Secondary battery, battery pack, electric vehicle, electric power storage system, electric power tool, and electronic device

Disclosed herein is a positive electrode active material prepared by mixing a lithium-containing compound, a compound containing a transition metal to be put into a solid solution, and a compound containing a metallic element M2 different from the transition metal, and firing the mixture to form composite oxide particles, depositing a compound containing at least one element selected from among sulfur (S), phosphorus (P) and fluorine (F) on surfaces of the particles, and firing the particles, whereby each of the particles is provided with a concentration gradient such that the concentration of the metallic element M2 increases from the center toward the surface of the particle, and at least one element selected from among (S), (P) and (F) is made present in the form of being aggregated at the surfaces of the composite oxide particles.

Positive electrode active material, positive electrode, nonaqueous electrolyte cell, and method of preparing positive electrode active material

A magnetic recording medium includes a tape-shaped nonmagnetic support, and a vertical magnetic layer formed on a main surface of the nonmagnetic support by a vacuum thin-film forming technique, signals being recorded on and reproduced from the vertical magnetic layer in a linear system. In the magnetic recording medium, the dipulse ratio of the vertical recording layer is 0.36 or more.

Magnetic recording medium and magnetic recording/reproducing system

The present invention provides a magnetic recording medium that excels in electromagnetic conversion characteristics. The magnetic recording medium has a 55 nm or less thickness magnetic layer formed on a major surface of an elongated nonmagnetic support by performing a vacuum thin film forming technique, the magnetic recording medium being slid over a magnetoresistive effect magnetic head or a giant magnetoresistive effect head to reproduce a signal, wherein an angle &#x3b8; which is formed by a growth direction of magnetic particles in a columnar structure in a longitudinal cross-section of the magnetic layer and a normal to a longitudinal direction of the nonmagnetic support, satisfies the following relation:25&#xb0;.where &#x3b8;i is an angle of &#x3b8; in an initial growth portion of the magnetic layer, and &#x3b8;f is an angle of &#x3b8; in a final growth portion of the magnetic layer.

Magnetic recording medium possessing a columnar structure

A lower magnetic layer magnetized and formed in a first direction and an upper magnetic layer magnetized and formed in a second direction opposite to the lower magnetic layer are laminated on a base. A ratio T/Tof a thickness Tof the upper magnetic layer to a thickness Tof the lower magnetic layer is located within a range of 0.6 to 0.9. Thus, in a herringbone type dual evaporated tape in which data is recorded and reproduced in a serpentine fashion, a vertical magnetization component is canceled to reduce the difference in the waveform distortion of a reproducing signal between a forward direction and a reverse direction.

Evaporation type magnetic recording medium and magnetic recording and reproducing device

A magnetic recording medium having a magnetic layer with a single-layered structure applicable to a linear system is provided. The magnetic recording medium includes an elongated nonmagnetic support and a single-layered magnetic layer having an orthorhombic structure formed on a main surface of the nonmagnetic support by a vacuum thin film deposition technique, and an Hcmax/Hxratio is not greater than 1.2, where Hcmax is a maximum value of a coercive force of the magnetic layer which acts in a plane perpendicular to the magnetic layer and containing a longitudinal direction of the magnetic recording medium, and Hcis a coercive force of the magnetic layer which acts in the longitudinal direction of the magnetic recording medium.

Magnetic recording medium

In the metallic thin film magnetic recording medium having the magnetic layer formed on a main face of a nonmagnetic supporting body according to vacuum thin film formation technology, the thickness of the nonmagnetic supporting body is 5 &mgr;m or less, the thickness of the magnetic layer is 20 nm-100 nm and a lining layer 20 nm-200 am in thickness is formed of metal, non-metal or alloy of these materials or oxide compound thereof according to vacuum thin film formation technology. Light transmittance is 5% or less and permeating water vapor amount is 5 g/m &middot;day or less. The lining layer and the back layer are formed successively on a main face opposite to the magnetic layer formation face. The relative roughness factor (Ra) of the topmost surface of the lining layer formation face is 2-15 nm.

Growing community of inventors

Miyagi, Japan

Kazunari Motohashi