Semiconductor Energy Laboratory Co., Ltd.

International Business Machines Corporation

Hitachi Global Storage Technologies Netherlands B.v.

Jvc Kenwood Corporation

Jun Ishikawa

Kyosuke Ito

Toru Itakura

Rie Yokoi

Shunpei Yamazaki

Hitoshi Tsujino

Kazuhei Narita

Teppei Oguni

Aya Uchida

Nobuhiro Inoue

Shinichi Kimura

Naoaki Kanada

Yasuhiro Jinbo

Junpei Momo

Tetsuya Kakehata

Sachiaki Tezuka

Masaki Yamakaji

Mayumi Mikami

David W Albrecht

Mutsuro Ohta

Satoshi Hayakawa

Kohji Takahashi

Kohichi Takeuchi

Masakazu Sasaki

Katsunori Ohshima

Kazuhiko Takada

Keiichiroh Yoshida

Masahiko Katoh

Miku Fujita

Wataru Fujisawa

Toshihiko Yuki

Keiichiro Yoshida

Katsumasa Nakatsukasa

Yoshiroh Amano

An electronic device having a novel structure is provided. A battery is provided in each component of an electronic device, whereby the electronic device includes two batteries. The electronic device including the two batteries and a display portion that can be called a flexible display and has a plurality of foldable portions is provided as a novel device.

Electronic device

A negative electrode active material with high capacity and excellent cycle performance and rate performance is provided. In addition, a secondary battery including the negative electrode active material, and an electronic device including the secondary battery are provided. Nanosilicon is mixed with a solid electrolyte containing lithium, titanium, phosphorus, and oxygen, and graphene oxide is further added thereto. Then, graphene oxide contained in the mixture is reduced with ethanol in which ascorbic acid and lithium hydroxide hydrate are dissolved, so that the negative electrode active material is manufactured.

Negative electrode active material, secondary battery, and electronic device

A semiconductor device having favorable electrical characteristics is provided. The semiconductor device includes a first oxide; a first conductor and a second conductor over the first oxide; a first insulator over the first conductor; a second insulator over the second conductor; a third insulator over the first insulator and the second insulator; a second oxide positioned over the first oxide and between the first conductor and the second conductor; a fourth insulator over the second oxide; a third conductor over the fourth insulator; a fifth insulator in contact with a top surface of the third insulator, a top surface of the second oxide, a top surface of the fourth insulator, and a top surface of the third conductor; a fourth conductor embedded in an opening formed in the first insulator, the third insulator, and the fifth insulator and in contact with the first conductor; and a fifth conductor embedded in an opening formed in the second insulator, the third insulator, and the fifth insulator and in contact with the second conductor. The third insulator includes, in the vicinity of an interface with the fourth conductor and in the vicinity of an interface with the fifth conductor, a region having a higher nitrogen concentration than a different region of the third insulator.

Method for manufacturing semiconductor device

A nonaqueous electrolyte of the present invention includes an ionic liquid including a first alicyclic quaternary ammonium cation having one or more substituents, a second alicyclic quaternary ammonium cation having an alicyclic skeleton that is the same as an alicyclic skeleton of the first alicyclic quaternary ammonium cation, and a counter anion to the first alicyclic quaternary ammonium cation and the second alicyclic quaternary ammonium cation and an alkali metal salt. In the second alicyclic quaternary ammonium cation, one of substituents bonded to a nitrogen atom in the alicyclic skeleton is a substituent including a halogen element. In the ionic liquid, the amount of a salt including the second alicyclic quaternary ammonium cation is less than or equal to 1 wt % per unit weight of the ionic liquid, or is less than or equal to 0.8 wt % per unit weight of the nonaqueous electrolyte.

Ionic liquid, nonaqueous electrolyte, and power storage device

A storage battery includes positive and negative electrodes and an electrolytic solution. The negative electrode includes a first element and carbon. The first element is any of silicon, tin, gallium, aluminum, germanium, lead, antimony, bismuth, silver, zinc, cadmium, and indium. The negative electrode includes an active material and a first layer in contact with a surface of the active material. The first layer has a thickness of 10 nm to 1000 nm inclusive. The electrolytic solution contains first and second cations. The first cation is one or more of a lithium ion, a sodium ion, a calcium ion, and a magnesium ion. The second cation is an imidazolium cation or a tertiary sulfonium cation.

Storage battery, battery control unit, and electronic device

A power storage device with high capacity is provided. Alternatively, a power storage device with high energy density is provided. Alternatively, a highly reliable power storage device is provided. Alternatively, a long-life power storage device is provided. A power storage device is characterized by comprising a separator, a first electrode, a second electrode, an electrolytic solution, in which the separator is provided between the first electrode and the second electrode, the first electrode includes an active material layer and a current collector, the first electrode includes a pair of coating films between which the current collector is sandwiched, the active material layer includes a region in contact with the current collector, the active material layer includes a region in contact with at least one of the pair of coating films, and the electrolytic solution includes an alkali metal salt and an ionic liquid.

Power storage device and electronic device

When cellulose is used as a separator, the cellulose is impregnated with an ionic liquid. Charge and discharge are repeated with this separator touching a surface of a current collector; then, the separator is changed in color. Thus, it is an object to provide a power storage device with a structure in which a side reaction other than a battery reaction, e.g., a change in color of separator, is unlikely to occur. In the power storage device, a separator impregnated with an ionic liquid is not in contact with a surface of a current collector. The separator has a tubular shape, a bag-like shape, or a sheet-like shape. The separator includes cellulose. The power storage device including the ionic liquid is non-volatile and non-flammable. The power storage device can be bent.

Power storage device including separator surrounding electrode

A power storage device with high capacity, a power storage device with high energy density, a highly reliable power storage device, and a long-life power storage device are provided. The power storage device includes a positive electrode, a separator, a negative electrode, and an electrolytic solution. The electrolytic solution contains an alkali metal salt and an ionic liquid. The separator is located between the positive electrode and the negative electrode. At least part of the positive electrode overlaps with the negative electrode. At least part of an end portion of the negative electrode is located inside a region between end portions of the positive electrode.

A power storage device with reduced initial irreversible capacity is provided. The power storage device includes a positive electrode including a positive electrode current collector and a positive electrode active material layer, a negative electrode including a negative electrode current collector and a negative electrode active material layer, and an electrolyte solution. In the negative electrode active material layer, the content percentage of a carbon material with an R value of 1.1 or more is less than 2 wt %. The R value refers to a ratio of a peak intensity Ito a peak intensity I(I/I). The peak intensity Iand the peak intensity Iare observed by Raman spectrometry at a Raman shift of 1360 cmand a Raman shift of 1580 cm, respectively. The electrolyte solution contains a lithium ion and an ionic liquid composed of an organic cation and an anion.

Power storage device

To provide an ionic liquid which has at least one of properties such as high ionic conductivity, a small reduction in ionic conductivity at a low temperature, a low melting point, and a low viscosity. To provide a power storage device having higher initial charge and discharge efficiency than a power storage device containing a conventional ionic liquid. A cyclic quaternary ammonium salt is liquid at room temperature and contains a quaternary spiro ammonium cation having an asymmetrical structure including two aliphatic rings and one or more substituents bonded to one or both of the two aliphatic rings and an anion corresponding to the quaternary spiro ammonium cation. The power storage device includes a positive electrode, a negative electrode, and a nonaqueous electrolyte containing the cyclic quaternary ammonium salt as a nonaqueous solvent.

Cyclic quaternary ammonium salt, nonaqueous solvent, nonaqueous electrolyte, and power storage device

Provided is a MEMS optical scanner that stably performs a scan with light by rotary moving a mirror centering on a V-axis in coincidence with a resonant frequency that enables ramp wave driving while securing shock resistance. The MEMS optical scanner includes a first substrate, a driving portion that drives the mirror by a piezoelectric film in a first axial direction where the piezoelectric film is installed on the first substrate, a frame that supports a driving portion, a second substrate, a support portion that supports the first substrate, a frame portion spaced from and surrounding the support portion, and an axis portion that supports the support portion and the frame portion along a second axial direction. It also includes a rigidity giving portion fixed to the second substrate at both ends thereof along the second axial direction and that drives the support portion in the second axial direction.

MEMS optical scanner

Growing community of inventors

Kanagawa, Japan

Jun Ishikawa