Sumitomo Chemical Company, Limited

Mitsubishi Electric Corporation

Ryo Eguchi

Takeshi Kawasato

Hajime Tamura

Tatsuya Inoue

Masahiko Tamura

Naoki Iwamoto

Shoichi Yokoyama

Tomoo Kato

Takeshi Kawasoto

To provide a lithium-containing composite oxide, a cathode active material and a positive electrode for a lithium ion secondary battery, with which a lithium ion secondary battery having favorable cycle characteristics even when charged at a high voltage can be obtained; and a lithium ion secondary battery having favorable cycle characteristics even when charged at a high voltage. A lithium-containing composite oxide which is represented by LiNiCoMnMOwherein M is Mg, Ca, Al, Ti, V, Nb, Mo, W or Zr, a+b+c+d+e=2, 'a' is from 1.01 to 1.10, b is from 0.30 to 0.95, c is from 0 to 0.35, d is from 0 to 0.35, and e is from 0 to 0.05, wherein in an X-ray diffraction pattern obtained by reflection X-ray diffraction employing Cu-K&#x3b1; rays, the ratio (I/I) of the integrated intensity (I) of a peak of (104) plane to the integrated intensity (I) of a peak of (110) plane is at least 4.20.

Lithium-containing composite oxide, cathode active material, positive electrode for lithium ion secondary battery, and lithium ion secondary battery

To provide a lithium-containing composite oxide capable of obtaining a lithium ion secondary battery having a large discharge capacity wherein the deterioration of the discharge voltage due to repetition of a charge and discharge cycle is suppressed, a cathode active material, a positive electrode for a lithium ion secondary battery and a lithium ion secondary battery. A lithium-containing composite oxide, which is represented by the formula I:LiNiCOMnMO&#x2003;&#x2003;Formula I,wherein M is at least one member selected from the group consisting of Na, Mg, Ti, Zr, Al, W and Mo, a+b+c+d+e=2, 1.1&#x2264;a/(b+c+d+e)&#x2264;1.4, 0.2&#x2264;b/(b+c+d+e)&#x2264;0.5, 0&#x2264;c/(b+c+d+e)&#x2264;0.25, 0.3&#x2264;d/(b+c+d+e)&#x2264;0.6, and 0&#x2264;e/(b+c+d+e)&#x2264;0.1, and wherein the valence of Ni is from 2.15 to 2.45.

A superconducting magnet device with which device breakage caused by a quench can be avoided while helium consumption is reduced. A sheet-like convection-preventing member is disposed at least either above or below a heat transfer member transferring to gaseous helium heat transferred from the outside, so as to cover a helium gas release tube for the gaseous helium, and thus heat exchange performance during transportation is improved. In the case where the quench occurs, the convection-preventing member is lifted upward in the release tube, thereby ensuring to provide a flow path for the gaseous helium and avoiding excessive increase of the internal pressure.

Superconducting magnet device

A superconducting magnet includes: a superconducting coil; a coolant container; a radiation shield; a vacuum container; a refrigerator configured to cool the inner part of the coolant container and the radiation shield; a first exhaust pipe connected to the coolant container from the outside of the vacuum container and serving as a flow path of the coolant vaporized; a first pressure release valve connected to a distal end of the first exhaust pipe outside the vacuum container and configured to open when a pressure in the coolant container becomes a first set value or higher; a heater provided at the first exhaust pipe and configured to heat the first exhaust pipe; and a detector provided at the first exhaust pipe and configured to detect a change due to occurrence of freezing in the first exhaust pipe.

Superconducting magnet

To provide a lithium-containing composite oxide capable of obtaining a lithium ion secondary battery having a large discharge capacity wherein the deterioration of the discharge voltage due to repetition of a charge and discharge cycle is suppressed, a cathode active material, a positive electrode for a lithium ion secondary battery and a lithium ion secondary battery. A lithium-containing composite oxide, which is represented by the formula I:LiNiCoMnMO&#x2003;&#x2003;Formula I,wherein M is at least one member selected from the group consisting of Na, Mg, Ti, Zr, Al, W and Mo, a+b+c+d+e=2, 1.1&#x2264;a/(b+c+d+e)&#x2264;1.4, 0.2&#x2264;b/(b+c+d+e)&#x2264;0.5, 0&#x2264;c/(b+c+d+e)&#x2264;0.25, 0.3&#x2264;d/(b+c+d+e)&#x2264;0.6, and 0&#x2264;e/(b+c+d+e)&#x2264;0.1, and wherein the valence of Ni is from 2.15 to 2.45.

A lithium-containing composite oxide essentially containing Li, Ni, Co and Mn, which has a crystal structure with space group R-3m, with a c-axis lattice constant being from 14.208 to 14.228 &#x212b;, and with an a-axis lattice constant and the c-axis lattice constant satisfying the relation of 3a+5.615&#x2264;c&#x2264;3a+5.655, and of which the integrated intensity ratio (I/I) of the (003) peak to the (104) peak in an XRD pattern is from 1.21 to 1.39.

Lithium-containing composite oxide and process for its production

A superconducting magnet includes a superconducting coil, a refrigerant container, a radiation shield, a vacuum container, a refrigerating machine cooling an interior of the refrigerant container, a tubular current lead passing from outside of the vacuum container to inside of the refrigerant container electrically connected to the superconducting coil, a power source electrically connected to the current lead, a manometer measuring a pressure inside of the refrigerant container, a thermometer to measure a temperature of the current lead, and a control unit connected to each of the power source, the manometer, and the thermometer. The control unit raises an output of the power source to vary a value of a current flowing into superconducting coil only when a measurement value of the manometer is higher than or equal to a set value and a measurement value of the thermometer is lower than or equal to a set value.

Growing community of inventors

Chiyoda-ku, Japan

Ryo Eguchi