公开(公告)号：US20240258497A1

公开(公告)日：2024-08-01

申请号：US18562365

申请日：2022-05-16

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Shunpei YAMAZAKI ,  Tetsuya KAKEHATA ,  Teppei OGUNI ,  Tatsuyoshi TAKAHASHI ,  Kazuya SHIMADA ,  Yohei MOMMA ,  Atsushi KAWATSUKI

IPC: H01M4/13 ,  H01G11/24 ,  H01G11/56 ,  H01G11/66 ,  H01M4/02 ,  H01M4/36 ,  H01M4/62

CPC classification number: H01M4/13 ,  H01G11/24 ,  H01G11/56 ,  H01G11/66 ,  H01M4/366 ,  H01M4/624 ,  H01M2004/021 ,  H01M2004/028 ,  H01M2220/10 ,  H01M2220/20 ,  H01M2220/30

Abstract: Electrodes and a secondary battery having high capacity density and being excellent in terms of rapid charging and rapid discharging are provided. The battery includes a positive electrode and a negative electrode. The positive electrode includes a current collector, a first layer overlapping with the current collector, and a second layer overlapping with the first layer. The first layer contains a first active material with a first particle diameter and the second layer contains a second active material with a second particle diameter. The first particle diameter is smaller than the second particle diameter. It is preferable that the second active material include a surface portion and an inner portion, the surface portion be a region within a depth of 10 nm or less from a surface of the second active material to the inner portion, and that the surface portion and the inner portion be topotaxy.

公开(公告)号：US20240429381A1

公开(公告)日：2024-12-26

申请号：US18692527

申请日：2022-09-09

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Jo SAITO ,  Atsushi KAWATSUKI ,  Yohei MOMMA ,  Shuhei YOSHITOMI ,  Kenta NAKANISHI ,  Tetsuya KAKEHATA

IPC: H01M4/525 ,  C01G51/00 ,  H01M10/0525 ,  H01M10/0569

Abstract: A method for forming a positive electrode active material that can be used for a lithium ion battery having excellent discharge characteristics even in a low-temperature environment is provided. The method includes a first step in which lithium cobalt oxide with a median diameter (D50) of less than or equal to 10 μm is heated at a temperature higher than or equal to 700° C. and lower than or equal to 1000° C. for longer than or equal to 1 hour and shorter than or equal to 5 hours, a second step in which a first mixture is formed by mixing a fluorine source and a magnesium source to the lithium cobalt oxide subjected to the first step, a third step in which the first mixture is heated at a temperature higher than or equal to 800° C. and lower than or equal to 1100° C. for longer than or equal to 1 hour and shorter than or equal to 10 hours, a fourth step in which a second mixture is formed by mixing a nickel source and an aluminum source to the first mixture subjected to the third step, and a fifth step in which the second mixture is heated at a temperature higher than or equal to 800° C. and lower than or equal to 950° C. for longer than or equal to 1 hour and shorter than or equal to 5 hours.

公开(公告)号：US20230387394A1

公开(公告)日：2023-11-30

申请号：US18249901

申请日：2021-10-13

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Shunpei YAMAZAKI ,  Tetsuya KAKEHATA ,  Shuhei YOSHITOMI ,  Atsushi KAWATSUKI

IPC: H01M4/36 ,  H01M4/525 ,  H01M4/58 ,  H01M4/48 ,  C01G53/00 ,  C01F7/02 ,  C01G49/00

CPC classification number: H01M4/366 ,  H01M4/525 ,  H01M4/5825 ,  H01M4/483 ,  C01G53/66 ,  C01F7/02 ,  C01G49/009 ,  H01M2004/028

Abstract: A positive electrode active material that is stable in a high potential state or a high temperature state and a highly safe secondary battery are provided. The positive electrode includes a first material and a second material and includes a region where at least part of a surface of the first material is covered with the second material. The first material includes a lithium cobalt oxide containing magnesium, fluorine, aluminum, and nickel. The second material includes a composite oxide (containing one or more selected from Fe, Ni, Co, and Mn) having an olivine crystal structure.

公开(公告)号：US20250015263A1

公开(公告)日：2025-01-09

申请号：US18763866

申请日：2024-07-03

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Atsushi KAWATSUKI ,  Naoto OKUZAWA ,  Mayumi MIKAMI ,  Yohei MOMMA

IPC: H01M4/36 ,  H01M4/02 ,  H01M4/38 ,  H01M4/58 ,  H01M4/60

Abstract: One embodiment of the present invention is to provide a high-capacity lithium ion secondary battery and a production method thereof. To perform surface modification, a spherical resin is subjected to first heat treatment at a temperature higher than or equal to 500° C. in an inert atmosphere. By the heating, the contraction of a particle, the void formation due to a gas release from an inside of the particle, the crack on a particle surface, and the like are caused so as to form a support for sulfur that is to be mixed later. Obtained spherical particles and sulfur powder are mixed and then stored in a container. The mixture in the container is subjected to second heat treatment at a temperature higher than or equal to 120° C. without being exposed to outside air.

公开(公告)号：US20240266594A1

公开(公告)日：2024-08-08

申请号：US18562562

申请日：2022-05-24

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Shuhei YOSHITOMI ,  Kaori OGITA ,  Shotaro MURATSUBAKI ,  Atsushi KAWATSUKI ,  Mayumi MIKAMI ,  Yohei MOMMA ,  Tetsuya KAKEHATA ,  Shunpei YAMAZAKI

IPC: H01M10/0562 ,  H01M4/02 ,  H01M4/505 ,  H01M4/525 ,  H01M4/583 ,  H01M10/0525

CPC classification number: H01M10/0562 ,  H01M4/505 ,  H01M4/525 ,  H01M4/583 ,  H01M10/0525 ,  H01M2004/027 ,  H01M2004/028 ,  H01M2220/30

Abstract: Provided is a secondary battery having a favorable interface contact between an active material and an electrolyte. The secondary battery includes a positive electrode layer, a negative electrode layer, and an electrolyte layer positioned between the positive electrode layer and the negative electrode layer. The positive electrode layer contains a positive electrode active material and a first solid electrolyte, the negative electrode layer contains a negative electrode active material and a second solid electrolyte, the electrolyte layer contains a third solid electrolyte and an ionic liquid, and a space in the third solid electrolyte is impregnated with the ionic liquid. The secondary battery is bendable.

公开(公告)号：US20240063387A1

公开(公告)日：2024-02-22

申请号：US18449140

申请日：2023-08-14

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Shunpei YAMAZAKI ,  Tetsuya KAKEHATA ,  Shuhei YOSHITOMI ,  Yohei MOMMA ,  Atsushi KAWATSUKI ,  Mayumi MIKAMI ,  Junya MARUYAMA ,  Akio ENDO ,  Kaori OGITA

IPC: H01M4/525 ,  C01G51/00 ,  H01M50/109 ,  H01M4/62 ,  H01M4/66 ,  H01M50/417

CPC classification number: H01M4/525 ,  C01G51/42 ,  H01M50/109 ,  H01M4/625 ,  H01M4/623 ,  H01M4/661 ,  H01M50/417 ,  C01P2002/52 ,  C01P2006/40 ,  C01P2004/61 ,  C01P2004/04 ,  C01P2002/90 ,  C01P2002/77 ,  C01P2002/72

Abstract: A positive electrode active material having a high charge-discharge capacity and high safety and a secondary battery including the positive electrode active material are provided. The positive electrode active material includes lithium, a transition metal M, an additive element, and oxygen. The powder volume resistivity of the positive electrode active material is higher than or equal to 1.0×105 Ω·cm at a temperature of higher than or equal to 180° C. and lower than or equal to 200° C. and at a pressure of higher than or equal to 0.3 MPa and lower than or equal to 2 MPa. The median diameter of the positive electrode active material is preferably greater than or equal to 3 μm and less than or equal to 10 μm.

公开(公告)号：US20240030413A1

公开(公告)日：2024-01-25

申请号：US18256478

申请日：2021-11-29

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Shunpei YAMAZAKI ,  Tetsuya KAKEHATA ,  Shuhei YOSHITOMI ,  Atsushi KAWATSUKI

IPC: H01M4/36 ,  H01M4/04 ,  H01M4/485 ,  H01M4/62 ,  H01M4/525 ,  H01M4/58 ,  H01M4/1315 ,  H01G11/46 ,  H01G11/86

CPC classification number: H01M4/366 ,  H01M4/0471 ,  H01M4/0404 ,  H01M4/485 ,  H01M4/625 ,  H01M4/525 ,  H01M4/5825 ,  H01M4/1315 ,  H01G11/46 ,  H01G11/86 ,  H01M2004/028

Abstract: A positive electrode and a secondary battery with little deterioration due to charge and discharge are provided. A positive electrode and a secondary battery with high electrode density are provided. Alternatively, a positive electrode and a secondary battery with excellent rate characteristics are provided. The positive electrode contains a positive electrode active material and a coating material. The coating material covers at least part of a surface of the positive electrode active material, and the positive electrode active material contains lithium cobalt oxide containing magnesium, fluorine, aluminum, and nickel. The lithium cobalt oxide includes a region with the highest concentration of one or more selected from the magnesium, the fluorine, and the aluminum in a surface portion. The coating material is preferably one or more selected from glass, carbon black, graphene, and a graphene compound.