Nec Corporation

Fuchita Nanotechnology Ltd.

Takeshi Azami

Hitoshi Ishikawa

Noboru Yoshida

Sumio Iijima

Yoshimi Kubo

Masako Yudasaka

Tsutomu Yoshitake

Ikiko Shimanuki

Daisuke Kasuya

Makihiro Otohata

Kazuaki Matsumoto

Eiji Fuchita

Takayoshi Konishi

A purpose of the present invention is to provide a lithium ion secondary battery having more improved life characteristics while suppressing gelation of an electrode mixture slurry in a manufacturing process. The lithium ion secondary battery according to the present invention comprises a positive electrode having a positive electrode mixture layer comprising a layered lithium-nickel composite oxide in which a proportion of nickel in metals other than lithium is 80 mol % or more; LiOH; LiCO; and a chlorine-containing polyvinylidene fluoride-based polymer, wherein a content of LiOH in the positive electrode mixture layer and a content of LiCOin the positive electrode mixture layer are each 0.1 weight % or more and 2.1 weight % or less, a total content of LiOH and LiCOin the positive electrode mixture layer is 0.2 weight % or more and 4.2 weight % or less, and a content of chlorine in the positive electrode mixture layer is 30 &#x3bc;g/g or more and 120 &#x3bc;g/g or less.

Lithium ion secondary battery

A purpose of one embodiment of the present invention is to provide a lithium ion secondary battery which comprises lithium nickel composite oxide having high nickel content in a positive electrode and has excellent battery characteristics. The first lithium ion secondary battery of the present invention comprises a lithium nickel composite oxide represented by the following formula and carbon nanotubes in a positive electrode, wherein a ratio (a)/(b) of an average length (a) of the carbon nanotubes to an average particle size (b) of primary particles of the lithium nickel composite oxide is 0.5 or more,LiNiMO

Provided is a lithium ion secondary battery that has excellent cycle characteristics and employs a silicon material for a negative electrode. This lithium ion secondary battery is characterized by having a negative electrode comprising a plate-like artificial graphite and a material comprising silicon as a constituent element, wherein at least some of particles of the plate-like artificial graphite are bent and have a crease on a plate face.

Lithium secondary battery

There is provided a lithium ion secondary battery having excellent cycle characteristics at a high temperature and comprising lithium nickel composite oxides, in which the Ni content is high, in a positive electrode. The present invention relates to a lithium ion secondary battery having a positive electrode, a negative electrode and an electrolyte solution, wherein the positive electrode comprises a lithium nickel complex oxide denoted by the general formula, LiNiCoMnO, wherein x, y, and z are respectively 0.75&#x2264;x&#x2264;0.85, 0.05&#x2264;y&#x2264;0.15, and 0.10&#x2264;z&#x2264;0.20.

Lithium-ion secondary battery

A lithium ion secondary battery having more improved cycle characteristics is provided. The present invention provides a lithium ion secondary battery which comprises a negative electrode comprising graphite particles, silicon oxide particles having a composition represented by SiO(0&#x3c;x&#x2264;2), and hardly graphitizable carbon particles.

A lithium ion secondary battery having more improved cycle characteristics is provided. The present invention relates to a lithium ion secondary battery having a negative electrode comprising a graphite and a silicon oxide having a composition represented by SiO(0&#x3c;x&#x2264;2), wherein AG/AS is within a range of 0.6 or more and 1.6 or less when a particle number average aspect ratio of the graphite is defined as AG and a particle number average aspect ratio of the silicon oxide is defined as AS.

A secondary battery which is highly safe even when it becomes in excessively high-temperature conditions and is excellent in cycle characteristics, and an electrode for a secondary battery are provided. The present invention relates to an electrode for a secondary battery comprising a maleimide compound and a conductive agent, wherein the conductive agent comprises at least one selected from carbon nanotube and carbon nanohorns.

Electrode for secondary battery and secondary battery using same

The present invention relates to a negative electrode for a lithium ion secondary battery, the negative electrode containing a negative electrode active material containing a first carbon and a second carbon, in which the first carbon is spherical graphite, the second carbon is massive graphite, and the sulfur concentration in the first carbon (Sx) and the sulfur concentration in the second carbon (Sy) are each independently 0 ppm or more and 300 ppm or less.

Negative electrode for lithium ion secondary battery comprising negative electrode active material containing two carbons and method for manufacturing lithium ion secondary battery comprising same

The present invention provides a lithium ion secondary battery comprising: a positive electrode; a negative electrode comprising a negative electrode active material comprising at least one carbon material selected from the group consisting of a natural graphite, an artificial graphite, a non-graphitizable carbon and a graphitizable carbon; and an electrolyte solution comprising a specific cyclic disulfonate ester compound and an acid anhydride.

A lithium ion secondary battery comprising a negative electrode comprising one or more types of carbon selected from the group consisting of natural graphite, artificial graphite, non-graphitizable carbon and easily graphitizable carbon; and an electrolyte solution comprising a cyclic sulfonic acid ester represented by the following formula (1): wherein in the formula (1), Rand Rare each independently a hydrogen atom, an alkyl group having 1 to 5 carbon atoms, a halogen group or an amino group with the proviso that Rand Rare not hydrogen atoms at the same time; Rrepresents a linkage group selected from the group consisting of an alkylene group having 1 to 5 carbon atoms, a carbonyl group, a sulfonyl group, a fluoroalkylene group having 1 to 6 carbon atoms, and a divalent group having 2 to 6 carbon atoms in which alkylene units or fluoroalkylene units are bonded through an ether group.

An apparatus for manufacturing carbon nanohorns includes a production chamber configured to irradiate a solid carbon material with a laser beam to produce a product containing carbon nanohorns; and a separation mechanism configured to separate the product produced in the production chamber into a lightweight component and a heavyweight component. The heavyweight component includes carbon nanohorn aggregate with high purity, and high-purity carbon nanotubes can be obtained by collecting the heavyweight component.

Apparatus and method for manufacturing carbon nanohorns

A plume () is generated by irradiating a side face of a graphite rod () with a laser beam () to vaporize carbon. The vaporized carbon is introduced to a carbon nanohorn recovery chamber () through a recovery pipe (), and the vaporized carbon is recovered as a carbon nanohorn assembly (). A cooling tank () including liquid nitrogen () is arranged in the recovery pipe (). While the cooling tank () controls the plume () at a low temperature, the cooling tank () cools the carbon vapor when the carbon vapor passes through the recovery pipe (). The cooled carbon vapor is recovered as the carbon nanohorn assembly () which is controlled in the desired shape and dimensions.

Carbon nanohorn producing device and carbon nanohorn producing method

Temperature of molten siliconin an infrared image furnaceincluding a halogen lampas a heating source to grow a single crystal of silicon in a floating-zone method is measured with high precision according to light radiated from the molten silicon. By disposing an optical path tube extending to the molten silicon, light propagating from the molten siliconin a particular direction can be extracted. As a result, light radiated from the molten siliconcan be extracted while reducing the influence of disturbance of light from various directions such as light radiated from the halogen lamp, reflected light and scattered light thereof, and the like. Luminance of light thus extracted is measured by a CCD camerato obtain the temperature according to the luminance, and hence the temperature can be measured with high precision using a measuring apparatus of a simple configuration.

Method and apparatus for measuring temperature

A plurality of a U-shaped heat radiation plates are provided on a heat radiating tube. These U-shaped plates have different sizes and elongated in the same direction so as to cross an axis of the tube. The emissive heat radiator may also includes at least one radiating plate 2 substantially perpendicular to each axis of the U-shaped plates. A concave surface of the U-shaped plate is subjected to a radiation surface processing, and a convex surface thereof is subjected to a reflection surface processing.

Emissive heat radiator with semi-cylindrical heat radiating member

A collector for a travelling-wave tube includes a collector core and a fin structure surrounding the core and having a plurality of fins for heat radiation. An oxide film having a thickness of greater than 50 .mu.m inclusive is formed on the outer periphery of the fin structure by anodization and has the maximum surface roughness of 12 .mu.m inclusive. When the 50 .mu.m or thicker oxide film is sealed or when a 45 .mu.m or thicker oxide film is formed and sealed, the oxide film is provided with the maximum surface roughness of greater than 12 .mu.m inclusive. The collector with any one of such structures achieves an emissivity of 0.90 or above and can efficiently radiate heat generated by the tube in the space.

Growing community of inventors

Tokyo, Japan

Takeshi Azami