公开(公告)号：US20240322159A1

公开(公告)日：2024-09-26

申请号：US18580290

申请日：2022-07-08

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Yusuke YOSHITANI ,  Daichi HIGO ,  Takashi HIRAHARA ,  Noriko MIYAIRI

IPC: H01M4/525 ,  H01M4/02 ,  H01M4/04 ,  H01M4/505

CPC classification number: H01M4/525 ,  H01M4/0471 ,  H01M4/505 ,  H01M2004/028

Abstract: A positive electrode active material with high charge and discharge capacity is provided. Alternatively, a novel positive electrode active material is provided. A compound containing nickel, cobalt, manganese, and aluminum (also referred to as a precursor) is obtained by using a coprecipitation method, and then, a mixture in which a lithium compound and the compound containing nickel, cobalt, manganese, and aluminum are mixed is heated at a first heating temperature. After the mixture is ground or crushed, the mixture is further heated at a second heating temperature, and an additive is mixed therein. Then, a third heat treatment is performed to manufacture a positive electrode active material.

公开(公告)号：US20250023105A1

公开(公告)日：2025-01-16

申请号：US18712499

申请日：2022-11-17

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Shunpei YAMAZAKI ,  Tetsuji ISHITANI ,  Noriko MIYAIRI ,  Daichi HIGO ,  Kaori OGITA ,  Takashi HIRAHARA

IPC: H01M10/0569 ,  H01M10/0525 ,  H01M10/0567 ,  H01M10/0568 ,  H01M50/105

Abstract: A nonaqueous solvent that can be used in a wide temperature range, has a low viscosity, has high lithium ion conductivity at low temperatures, or has high heat resistance is provided. The nonaqueous solvent containing an ionic liquid and an organic electrolyte for low-temperature use has a low viscosity even at low temperatures and has high carrier ion conductivity. As the organic electrolyte for low-temperature use, an electrolyte in which methyl ethyl carbonate accounts for greater than or equal to 30 volume % and less than or equal to 65 volume % can be used. A battery using the nonaqueous solvent as an electrolyte can be used in a wide temperature range and thus is preferable.

公开(公告)号：US20230327092A1

公开(公告)日：2023-10-12

申请号：US18004700

申请日：2021-07-01

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Kazutaka KURIKI ,  Tatsuyoshi TAKAHASHI ,  Yoshiharu ASADA ,  Daichi HIGO ,  Yuji IWAKI ,  Shunpei YAMAZAKI ,  Taisuke NAKAO ,  Teppei OGUNI

IPC: H01M4/38 ,  H01M4/587 ,  H01M4/134 ,  H01M4/133

CPC classification number: H01M4/386 ,  H01M4/133 ,  H01M4/134 ,  H01M4/587

Abstract: An electrode with little deterioration or a secondary battery with little deterioration is provided. An electrode includes a first region and a second region. The first region includes a particle containing silicon. The second region includes a particle containing silicon and a graphene compound. The second region is in contact with the first region to cover at least part thereof. Alternatively, an electrode includes a plurality of particles containing silicon and a graphene compound. Each of the plurality of particles containing silicon includes a functional group containing oxygen and carbon, a functional group containing oxygen, or a fluorine atom in at least part of the surface. The graphene compound includes at least one of carbon terminated with hydrogen and carbon terminated with fluorine in a plane of the graphene compound. The graphene compound is in contact with the plurality of particles containing silicon to closely cling thereto. The particle containing silicon preferably contains amorphous silicon or polycrystalline silicon.

公开(公告)号：US20230246190A1

公开(公告)日：2023-08-03

申请号：US18001349

申请日：2021-06-07

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Shunpei YAMAZAKI ,  Kanta ABE ,  Daichi HIGO

IPC: H01M4/583 ,  H01M4/133 ,  C01B32/194

CPC classification number: H01M4/5835 ,  H01M4/133 ,  C01B32/194 ,  C01B2204/22 ,  C01P2002/77 ,  C01P2002/78

Abstract: A carbon material with excellent characteristics is provided. An electrode having excellent characteristics can be provided. A novel carbon material can be provided. A novel electrode can be provided. A graphene compound including a vacancy includes a plurality of carbon atoms and one or more fluorine atoms, and the vacancy is formed with the plurality of carbon atoms and one or more fluorine atoms. The vacancy includes a ring-shaped region composed of the plurality of carbon atoms, and one or more fluorine atoms terminated in the ring-shaped region, and the ring-shaped region is a 18- or more-membered ring.