公开(公告)号：US20200343530A1

公开(公告)日：2020-10-29

申请号：US16923494

申请日：2020-07-08

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Teruaki OCHIAI ,  Takahiro KAWAKAMI ,  Mayumi MIKAMI ,  Yohei MOMMA ,  Masahiro TAKAHASHI ,  Ayae TSURUTA

IPC: H01M4/131 ,  H01M4/1315 ,  H01M4/1391 ,  H01M4/62 ,  H01M4/13915 ,  H01M4/86

Abstract: A positive electrode active material which can improve cycle characteristics of a secondary battery is provided. Two kinds of regions are provided in a superficial portion of a positive electrode active material such as lithium cobaltate which has a layered rock-salt crystal structure. The inner region is a non-stoichiometric compound containing a transition metal such as titanium, and the outer region is a compound of representative elements such as magnesium oxide. The two kinds of regions each have a rock-salt crystal structure. The inner layered rock-salt crystal structure and the two kinds of regions in the superficial portion are topotaxy; thus, a change of the crystal structure of the positive electrode active material generated by charging and discharging can be effectively suppressed. In addition, since the outer coating layer in contact with an electrolyte solution is the compound of representative elements which is chemically stable, the secondary battery having excellent cycle characteristics can be obtained.

公开(公告)号：US20200328413A1

公开(公告)日：2020-10-15

申请号：US16910170

申请日：2020-06-24

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Yohei MOMMA ,  Takahiro KAWAKAMI ,  Teruaki OCHIAI ,  Masahiro TAKAHASHI

IPC: H01M4/46 ,  H01M4/1391 ,  H01M4/62 ,  H01M4/36 ,  H01M4/131 ,  H01M10/0525

Abstract: Provided is a positive electrode active material for a lithium ion secondary battery having favorable cycle characteristics and high capacity. A covering layer containing aluminum and a covering layer containing magnesium are provided on a superficial portion of the positive electrode active material. The covering layer containing magnesium exists in a region closer to a particle surface than the covering layer containing aluminum is. The covering layer containing aluminum can be formed by a sol-gel method using an aluminum alkoxide. The covering layer containing magnesium can be formed as follows: magnesium and fluorine are mixed as a starting material and then subjected to heating after the sol-gel step, so that magnesium is segregated.

公开(公告)号：US20200313178A1

公开(公告)日：2020-10-01

申请号：US16901118

申请日：2020-06-15

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Yohei MOMMA ,  Takahiro KAWAKAMI ,  Teruaki OCHIAI ,  Masahiro TAKAHASHI

IPC: H01M4/46 ,  H01M4/1391 ,  H01M4/62 ,  H01M4/36 ,  H01M4/131 ,  H01M10/0525

Abstract: Provided is a positive electrode active material for a lithium ion secondary battery having favorable cycle characteristics and high capacity. A covering layer containing aluminum and a covering layer containing magnesium are provided on a superficial portion of the positive electrode active material. The covering layer containing magnesium exists in a region closer to a particle surface than the covering layer containing aluminum is. The covering layer containing aluminum can be formed by a sol-gel method using an aluminum alkoxide. The covering layer containing magnesium can be formed as follows: magnesium and fluorine are mixed as a starting material and then subjected to heating after the sol-gel step, so that magnesium is segregated.

公开(公告)号：US20180366726A1

公开(公告)日：2018-12-20

申请号：US16114312

申请日：2018-08-28

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Takahiro KAWAKAMI ,  Teruaki OCHIAI ,  Shuhei YOSHITOMI ,  Takuya HIROHASHI ,  Mako MOTOYOSHI ,  Yohei MOMMA ,  Junya GOTO

IPC: H01M4/505 ,  H01M4/131 ,  H01M4/1391 ,  H01M4/36

Abstract: To increase capacity per weight of a power storage device, a particle includes a first region, a second region in contact with at least part of a surface of the first region and located on the outside of the first region, and a third region in contact with at least part of a surface of the second region and located on the outside of the second region. The first and the second regions contain lithium and oxygen. At least one of the first region and the second region contains manganese. At least one of the first and the second regions contains an element M. The first region contains a first crystal having a layered rock-salt structure. The second region contains a second crystal having a layered rock-salt structure. An orientation of the first crystal is different from an orientation of the second crystal.

公开(公告)号：US20160380271A1

公开(公告)日：2016-12-29

申请号：US15189517

申请日：2016-06-22

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Teruaki OCHIAI ,  Takahiro KAWAKAMI ,  Takuya MIWA

IPC: H01M4/66 ,  H01M4/505 ,  H01M10/0525 ,  H01M10/0587 ,  H02J7/02 ,  H01M2/34 ,  H01M10/0585 ,  H01M4/1391 ,  H01M4/04 ,  H01L29/786 ,  H01M4/131 ,  H01M2/30

Abstract: A novel electrode is provided. A novel power storage device is provided. A conductor having a sheet-like shape is provided. The conductor has a thickness of greater than or equal to 800 nm and less than or equal to 20 μm. The area of the conductor is greater than or equal to 25 mm2 and less than or equal to 10 m2. The conductor includes carbon and oxygen. The conductor includes carbon at a concentration of higher than 80 atomic % and oxygen at a concentration of higher than or equal to 2 atomic % and lower than or equal to 20 atomic %.

Abstract translation: 提供了一种新颖的电极。 提供了一种新颖的蓄电装置。 提供具有片状形状的导体。 导体具有大于或等于800nm且小于或等于20μm的厚度。 导体面积大于或等于25mm2且小于或等于10m2。 导体包括碳和氧。 导体包括浓度高于80原子％的碳和浓度高于或等于2原子％且低于或等于20原子％的氧。

公开(公告)号：US20150069390A1

公开(公告)日：2015-03-12

申请号：US14541165

申请日：2014-11-14

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Shunpei YAMAZAKI ,  Takahiro TSUJI ,  Teruaki OCHIAI ,  Koji KUSUNOKI ,  Hidekazu MIYAIRI

IPC: H01L29/786

CPC classification number: H01L29/7869 ,  H01L29/45

Abstract: An object is to provide a highly reliable transistor and a semiconductor device including the transistor. A semiconductor device including a gate electrode; a gate insulating film over the gate electrode; an oxide semiconductor film over the gate insulating film; and a source electrode and a drain electrode over the oxide semiconductor film, in which activation energy of the oxide semiconductor film obtained from temperature dependence of a current (on-state current) flowing between the source electrode and the drain electrode when a voltage greater than or equal to a threshold voltage is applied to the gate electrode is greater than or equal to 0 meV and less than or equal to 25 meV, is provided.

Abstract translation: 目的是提供一种高度可靠的晶体管和包括晶体管的半导体器件。 一种包括栅电极的半导体器件; 栅电极上的栅极绝缘膜; 栅极绝缘膜上的氧化物半导体膜; 以及氧化物半导体膜上的源电极和漏电极，其中当氧化物半导体膜的电压大于电压时，源电极和漏电极之间流过的电流（导通电流）的温度依赖性获得氧化物半导体膜的活化能 或等于施加到栅电极的阈值电压大于或等于0meV且小于或等于25meV。

公开(公告)号：US20150014581A1

公开(公告)日：2015-01-15

申请号：US14328251

申请日：2014-07-10

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Takahiro KAWAKAMI ,  Shuhei YOSHITOMI ,  Teruaki OCHIAI ,  Yumiko SAITO ,  Yohei MOMMA ,  Satoshi SEO

IPC: H01M4/505 ,  H01M4/36 ,  H01M4/58

CPC classification number: H01M4/505 ,  H01M4/364 ,  H01M4/485 ,  H01M4/525

Abstract: A positive electrode active material that achieves high capacity and high energy density of a secondary battery is provided. The positive electrode active material is represented by Li2Mn1-XAXO3 and contains a metal element, Si, or P as A. The positive electrode active material has higher discharge capacity than Li2MnO3.

Abstract translation: 提供了实现二次电池的高容量和高能量密度的正极活性物质。 正极活性物质由Li2Mn1-XAXO3表示，并含有金属元素Si或P为A.正极活性物质的放电容量高于Li2MnO3。

公开(公告)号：US20250140843A1

公开(公告)日：2025-05-01

申请号：US18927228

申请日：2024-10-25

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Mayumi MIKAMI ,  Jo SAITO ,  Teruaki OCHIAI ,  Masahiro TAKAHASHI ,  Tatsuyoshi TAKAHASHI ,  Yohei MOMMA ,  Kazutaka KURIKI ,  Kazune YOKOMIZO ,  Shunpei YAMAZAKI ,  Rihito WADA

IPC: H01M4/525 ,  H01M4/02 ,  H01M4/36 ,  H01M10/052 ,  H01M10/0568 ,  H01M10/0569

Abstract: To provide a positive electrode active material in which a phase transition is inhibited and a secondary battery including the positive electrode active material. An unprecedented synthesis method has been developed in which lithium cobalt oxide particles are treated with a molten salt of MgF2—LiF as a reaction accelerator to facilitate the diffusion and doping of magnesium into lithium cobalt oxide bulk and to form a stable coating layer in the particle surface portion. Ex situ XRD analysis confirms the inhibition of the harmful phase transition and the emergence of a novel phase as the modified LiCoO2 is charged up to 4.7 V. The modified LiCoO2 shows high electrochemical performance during high-voltage operation. This technology provides a guideline for suppressing fundamental degradation associated with phase transition and achieving ultra-high energy density LiCoO2 positive electrodes.

公开(公告)号：US20250055087A1

公开(公告)日：2025-02-13

申请号：US18724035

申请日：2022-12-16

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Kazutaka KURIKI ,  Seiya SAITO ,  Teruaki OCHIAI ,  Kengo AKIMOTO

IPC: H01M50/136 ,  H01G11/28 ,  H01G11/50 ,  H01M4/02 ,  H01M4/04 ,  H01M4/38 ,  H01M4/525 ,  H01M50/105

Abstract: The relative position shifts of a positive electrode and a negative electrode occur owing to bending in charge or discharge, whereby uneven distribution is caused and potential varies. Not graphite but a lithium metal film is used as the negative electrode. A lithium metal film is formed over one side of the negative electrode current collector by an evaporation method or a sputtering method, and a laminated body is formed such that surfaces of two negative electrode current collectors where no film is formed are in contact with each other.

公开(公告)号：US20240234718A1

公开(公告)日：2024-07-11

申请号：US18561360

申请日：2022-05-09

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Jo SAITO ,  Yohei MOMMA ,  Mayumi MIKAMI ,  Teruaki OCHIAI

IPC: H01M4/525 ,  C01G51/00 ,  H01M4/02 ,  H01M4/131 ,  H01M10/0525

CPC classification number: H01M4/525 ,  C01G51/42 ,  H01M4/131 ,  H01M10/0525 ,  C01P2002/72 ,  C01P2004/03 ,  C01P2004/04 ,  C01P2006/40 ,  H01M2004/028 ,  H01M2220/20

Abstract: A method for forming a positive electrode active material that is stable in a high potential state and/or a high temperature state is provided. The method for forming a positive electrode active material includes a step of mixing a composite oxide containing lithium and cobalt with a barium source, a magnesium source, and a fluorine source to fabricate a first mixture containing barium fluoride, magnesium fluoride, and lithium fluoride; a step of heating the first mixture at a temperature higher than or equal to 800° C. and lower than or equal to 1100° C. for longer than or equal to 2 hours; a step of mixing the first mixture with a nickel source and an aluminum source to fabricate a second mixture; and a step of heating the second mixture at a temperature higher than or equal to 800° C. and lower than or equal to 1100° C. for longer than or equal to 2 hours. When a molar ratio of magnesium fluoride to barium fluoride contained in the first mixture is MgF2:BaF2=y:1, y satisfies greater than or equal to 0.5 and less than or equal to 10.