公开(公告)号：US20210020928A1

公开(公告)日：2021-01-21

申请号：US16982959

申请日：2019-03-26

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Mayumi MIKAMI ,  Jun ISHIKAWA ,  Miku FUJITA ,  Kazuhei NARITA

IPC: H01M4/38 ,  H01M4/133 ,  H01M4/131 ,  H01M4/134 ,  H01M10/0525

Abstract: 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.

公开(公告)号：US20240379947A1

公开(公告)日：2024-11-14

申请号：US18690309

申请日：2022-09-05

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Jun ISHIKAWA ,  Mayumi MIKAMI ,  Miku FUJITA ,  Yohei MOMMA

IPC: H01M4/36 ,  H01M4/02 ,  H01M4/04 ,  H01M4/48 ,  H01M4/62

Abstract: An object of an embodiment of the present invention is to provide a negative electrode with high capacity. Another embodiment of the present invention is to provide a novel secondary battery. A surface treatment layer, specifically a metal film typified by a titanium film, is formed on the surface of a SiOx particle. Providing the surface treatment layer can suppress rapid volume expansion of SiOx, thereby reducing a change in volume of the negative electrode active material layer or reducing formation of a space between the negative electrode active materials. Furthermore, providing such a metal film on the particle surface can improve the conductivity. Moreover, a change in quality due to a reaction between the SiOx particle and the electrolyte solution can be reduced owing to the presence of the surface treatment layer.

公开(公告)号：US20250046799A1

公开(公告)日：2025-02-06

申请号：US18826241

申请日：2024-09-06

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Hiroyuki MIYAKE ,  Nobuhiro INOUE ,  Ryo YAMAUCHI ,  Mako MOTOYOSHI ,  Takahiro KAWAKAMI ,  Mayumi MIKAMI ,  Miku FUJITA ,  Shunpei YAMAZAKI

IPC: H01M4/36 ,  H01G11/06 ,  H01G11/28 ,  H01G11/30 ,  H01G11/36 ,  H01G11/50 ,  H01M4/134 ,  H01M4/38 ,  H01M4/62 ,  H01M10/0525

Abstract: A power storage device having high capacitance is provided. A power storage device with excellent cycle characteristics is provided. A power storage device with high charge and discharge efficiency is provided. A power storage device including a negative electrode with low resistance is provided. A negative electrode for a power storage device includes a number of composites in particulate forms. The composites include a negative electrode active material, a first functional material, and a compound. The compound includes a constituent element of the negative electrode active material and a constituent element of the first functional material. The negative electrode active material includes a region in contact with at least one of the first functional material or the compound.

公开(公告)号：US20170170466A1

公开(公告)日：2017-06-15

申请号：US15374048

申请日：2016-12-09

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Hiroyuki MIYAKE ,  Nobuhiro INOUE ,  Ryo YAMAUCHI ,  Mako MOTOYOSHI ,  Takahiro KAWAKAMI ,  Mayumi MIKAMI ,  Miku FUJITA ,  Shunpei YAMAZAKI

IPC: H01M4/36 ,  H01M4/62 ,  H01M4/134 ,  H01M10/0525 ,  H01M4/38

CPC classification number: H01M4/366 ,  H01G11/06 ,  H01G11/28 ,  H01G11/30 ,  H01G11/36 ,  H01G11/50 ,  H01M4/134 ,  H01M4/386 ,  H01M4/626 ,  H01M10/0525

Abstract: A power storage device having high capacitance is provided. A power storage device with excellent cycle characteristics is provided. A power storage device with high charge and discharge efficiency is provided. A power storage device including a negative electrode with low resistance is provided. A negative electrode for a power storage device includes a number of composites in particulate forms. The composites include a negative electrode active material, a first functional material, and a compound. The compound includes a constituent element of the negative electrode active material and a constituent element of the first functional material. The negative electrode active material includes a region in contact with at least one of the first functional material or the compound.