Nec Corporation

Other

Nec Tokin Tochigi, Ltd.

Yutaka Bannai

Masaharu Satoh

Hiroshi Yageta

Hironori Yamamoto

Masato Shirakata

Mariko Miyachi

Shigeyuki Iwasa

Etsuo Hasegawa

Kentaro Nakahara

Jiro Iriyama

Yukiko Morioka

Koji Utsugi

Mitsuhiro Mori

Tamaki Miura

Hidemasa Kawai

Ikiko Yamazaki

Tomokazu Kumeuchi

Norihide Ohyama

Kosuke Amano

Ryuichi Shimizu

A secondary battery includes an anode for a secondary battery, a cathode which absorbs and discharges lithium ions, and an electrolyte which is placed between the anode for the secondary battery and the cathode. The anode for the secondary battery includes an anode active material layer which absorbs and discharges lithium ions, the anode active material layer including a first layer including carbon as a chief ingredient, and a second layer including at least one first element having a theoretical capacity greater than a theoretical capacity of graphite, and at least one second element which has a theoretical capacity equal to or less than the theoretical capacity of graphite. The second layer includes particles, and the particles include the first element and the second element.

Anode for secondary battery and secondary battery using the same

Since a first layer (a carbon layer) whose chief ingredient is carbon and a second layer (Li absorbing layer) containing particles having a theoretical capacity greater than that of graphite are formed on anode collector, high capacity and high operation voltage can be realized. Since a element having a theoretical capacity equal to or less than that of graphite is added to the particles constituting this second layer, expansion and contraction of volume according to the charge and discharge are suppressed. This enables capacity deterioration to be suppressed even though cycles go on.

Negative electrode for secondary cell and secondary cell using the same

A radical compound may be used as an active material for an anode layerto provide a novel stable secondary battery with a higher energy density and a larger capacity. The radical compound used has, for example, a spin concentration of 10spins/g or more.

Secondary battery with a radical compound active material

A vacuum deposition apparatus is used for deposit evaporated substance from evaporation sources (and) on the desired position of a flexible substrate (). While the flexible substrate () is carried using rollers in a vacuum, shutters (and) are opened and closed to control the movement of the evaporated substance via openings. A film having a desired shape of pattern is formed on the flexible substrate () with higher controllability.

Device and method for vacuum film formation

An object of the present invention is to provide a negative electrode for a secondary battery which has large capacity and restrains a rise in resistance inside the battery and reduction in capacity even after cycles and the secondary battery using the same. A first active material layercomprising members occluding and releasing Li onto a collectoris formed and a second active material layeras an alloy layer containing metal forming alloy with lithium or lithium and metal not-forming alloy with lithium is formed thereon. The secondary battery is constituted using the negative electrode.

Secondary battery-use negative electrode and secondary battery using it

An anode with a multi-layer structure including a first layer () having carbon as a main component, and a second layer () having lithium-ion conductivity and including a material as a main component thereof which can insert and extract lithium ions, or a multi-layer structure including a third layer () containing lithium in addition to the first layer and the second layer, and a lithium secondary battery including the same. The lithium secondary battery can be provided in which the battery capacity is substantially enhanced in the voltage range where the battery is actually used while maintaining the higher charge-discharge efficiency and the excellent cycle performance.

Nonaqueous electrolyte cell

In a secondary battery comprising a positive electrode, a negative electrode and an electrolyte therebetween, active material of one of the positive electrode and the negative electrode includes a compound having boron radicals or sulfur radicals.

Secondary battery having radical compound electrode

A battery includes active material containing neutral carbon radical compound at one of or both of the electrodes, and the neutral carbon radicals participate in electrode reaction for generating current; the battery is light, because any heavy metal is not required for the active material, and the battery achieves large capacity without sacrifice of stability, because the unpaired electrons are localized at the carbon atoms in the neutral carbon radical compound.

Battery having active material containing neutral carbon radical compound

Secondary battery

In a film packed battery, a battery power source comprising, at least, a cathode, an anode, an electrolyte, and a separator is packed with a film. In a method for producing film packed battery, a pre-charging step for charging the film packed battery while pressure is applied, for example, by sandwiching it between two flat plates is included at least once.

Method for producing a pressurized package for a film packed battery

A battery with a laminated film as a casing encapsulating the battery power source is manufactured by the steps of: heat sealing the sealing area of the laminated film, whereby encapsulating the battery power source in the laminated film; and irradiating, with an electron beam, a portion of the heat sealed area, thereby the irradiated area crosses, in the direction along the peripheries of the heat sealed area, the overlapping areas of the heat sealed area and the leading electrodes projecting toward outside from the positive electrode and the negative electrode. According to this method, produced is a battery having a high peeling strength at the position of terminals of leading electrodes without sacrificing battery properties and therefore having high reliability and safety.

Method for production of battery

In a secondary battery wherein a positive electrode active material layer and a negative electrode active material layer are allowed to face each other via a liquid electrolyte solution , there is used, as the electrolyte solution , a basic solvent containing a halogenated polyolefin and an aliphatic polyolefin dissolved therein.

Liquid electrolyte solution including a halogenated and aliphatic polyolefin dissolved therein and secondary battery

A secondary battery has a positive electrode, an electrolyte, and a negative electrode. The electrolyte is made up of a high molecular gel electrolyte comprising a matrix polymer and an electrolyte solution included in the matrix polymer. The electrolyte solution is formed by dissolving an ionic compound in a nonaqueous organic solvent. The matrix polymer forms a high molecular network by dispersing (i) a compound containing at least two polymerizable functional groups, (ii) compound having a polymerizable functional group and containing one of a carbonyl group, an amido group, and an oxyalkylene group, and (iii) a vinylidene fluoride polymer and polymerizing them.

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Tokyo, Japan

Yutaka Bannai