公开(公告)号：US20250062349A1

公开(公告)日：2025-02-20

申请号：US18935745

申请日：2024-11-04

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Ryota TAJIMA ,  Yumiko YONEDA ,  Yohei MOMMA ,  Shunpei YAMAZAKI

IPC: H01M4/583 ,  H01M4/02 ,  H01M4/38 ,  H01M4/62 ,  H01M10/0525 ,  H01M10/0562

Abstract: Use of silicon as a negative electrode active material particle causes a problem of expansion and contraction of the negative electrode active material particle due to charging and discharging. A negative electrode active material particle or a plurality of negative electrode active material particles are bound or fixed using a graphene compound to inhibit expansion and contraction of the negative electrode active material particle due to charging and discharging. In an all-solid-state secondary battery, an interface between a solid electrolyte and a negative electrode or an interface between the solid electrolyte and a positive electrode has the highest resistance. In order to reduce the interface resistance, at least the negative electrode active material particle is surrounded by a graphene compound to increase the conductivity. Alternatively, a positive electrode active material particle is surrounded by a graphene compound to increase the conductivity. Carrier ions, e.g., lithium ions, pass through a graphene compound, and thus the graphene compound does not hinder the transfer of lithium ions between the positive electrode and the negative electrode in charging or discharging.

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：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：US20240347760A1

公开(公告)日：2024-10-17

申请号：US18293877

申请日：2022-07-26

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Kazuya SHIMADA ,  Yohei MOMMA ,  Shuhei YOSHITOMI ,  Fumiko TANAKA ,  Kazutaka KURIKI

IPC: H01M10/0525 ,  H01M4/02 ,  H01M4/525 ,  H01M4/587 ,  H01M10/0568 ,  H01M10/44

CPC classification number: H01M10/0525 ,  H01M4/525 ,  H01M4/587 ,  H01M10/0568 ,  H01M10/443 ,  H01M2004/021

Abstract: A lithium ion battery having an excellent discharge characteristics even at temperatures below freezing is to be provided. The lithium ion battery includes a positive electrode including a positive electrode active material, an electrolyte, and a negative electrode including a negative electrode active material that is a carbon material. In the lithium ion battery, a value of discharge capacity obtained by, after performing constant current charging at a charge rate of 0.1 C (where 1 C=200 mA/g) until a voltage reaches 4.5 V and then performing constant voltage charging at 4.5 V until a current value achieves 0.01 C in an environment of 25° C., performing constant current discharging at a discharge rate of 0.1 C until a voltage reaches 2.5 V in an environment of −40° C. is higher than or equal to 50% of a value of discharge capacity obtained by, after performing constant current charging at a charge rate of 0.1 C (where 1 C=200 mA/g) until a voltage reaches 4.5 V and then performing constant voltage charging at 4.5 V until a current value achieves 0.01 C in an environment of 25° C., performing constant current discharging at a discharge rate of 0.1 C until a voltage reaches 2.5V in an environment of 25° C.

公开(公告)号：US20240266502A1

公开(公告)日：2024-08-08

申请号：US18442424

申请日：2024-02-15

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Masahiro TAKAHASHI ,  Teruaki OCHIAI ,  Yohei MOMMA ,  Ayae TSURUTA

IPC: H01M4/36 ,  H01M4/02 ,  H01M4/505 ,  H01M4/525

CPC classification number: H01M4/364 ,  H01M4/505 ,  H01M4/525 ,  H01M2004/028

Abstract: A positive electrode active material particle with little deterioration is provided. A power storage device with little deterioration is provided. A highly safe power storage device is provided. The positive electrode active material particle includes a first crystal grain, a second crystal grain, and a crystal grain boundary positioned between the crystal grain and the second crystal grain; the first crystal grain and the second crystal grain include lithium, a transition metal, and oxygen; the crystal grain boundary includes magnesium and oxygen; and the positive electrode active material particle includes a region where the ratio of the atomic concentration of magnesium in the crystal grain boundary to the atomic concentration of the transition metal in first crystal grain and the second crystal grain is greater than or equal to 0.010 and less than or equal to 0.50.

公开(公告)号：US20240092655A1

公开(公告)日：2024-03-21

申请号：US18263740

申请日：2022-01-21

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Shunpei YAMAZAKI ,  Yusuke YOSHITANI ,  Yohei MOMMA ,  Kunihiro FUKUSHIMA ,  Tetsuya KAKEHATA

IPC: C01G51/00

CPC classification number: C01G51/42

Abstract: A novel method for forming a positive electrode active material is provided. In the method for forming a positive electrode active material, a cobalt source and an additive element source are mixed to form an acidic solution; the acidic solution and an alkaline solution are made to react to form a cobalt compound; the cobalt compound and a lithium source are mixed to form a mixture; and the mixture is heated. The additive element source is a compound containing one or more selected from gallium, aluminum, boron, nickel, and indium.

公开(公告)号：US20230361290A1

公开(公告)日：2023-11-09

申请号：US18212440

申请日：2023-06-21

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

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

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

CPC classification number: H01M4/505 ,  H01M4/366 ,  H01M4/131 ,  H01M4/1391 ,  H01M2220/30

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：US20230327073A1

公开(公告)日：2023-10-12

申请号：US18203085

申请日：2023-05-30

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 ,  H01M4/134 ,  H01M4/36 ,  H01M4/525 ,  H01M4/86

CPC classification number: H01M4/131 ,  H01M4/1315 ,  H01M4/1391 ,  H01M4/625 ,  H01M4/13915 ,  H01M4/134 ,  H01M4/366 ,  H01M4/525 ,  H01M4/8657 ,  H01M2004/021

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：US20230299274A1

公开(公告)日：2023-09-21

申请号：US18201818

申请日：2023-05-25

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

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

IPC: H01M4/36 ,  H01M4/04 ,  H01M4/62 ,  H01G11/24 ,  H01G11/86 ,  H01G11/50 ,  H01G11/60 ,  H01M4/505 ,  H01M4/525

CPC classification number: H01M4/366 ,  H01M4/0471 ,  H01M4/62 ,  H01G11/24 ,  H01G11/86 ,  H01G11/50 ,  H01G11/60 ,  H01M4/505 ,  H01M4/525 ,  H01M4/628 ,  H01M10/0525

Abstract: Provided is a positive electrode active material which suppresses a reduction in capacity due to charge and discharge cycles when used in a lithium ion secondary battery. A covering layer is formed by segregation on a superficial portion of the positive electrode active material. The positive electrode active material includes a first region and a second region. The first region exists in an inner portion of the positive electrode active material. The second region exists in a superficial portion of the positive electrode active material and part of the inner portion thereof. The first region includes lithium, a transition metal, and oxygen. The second region includes magnesium, fluorine, and oxygen.

公开(公告)号：US20230014507A1

公开(公告)日：2023-01-19

申请号：US17782835

申请日：2020-12-01

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

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

IPC: F27B7/18 ,  H01M4/04 ,  F27B7/36 ,  F27B7/42 ,  F27D5/00 ,  C01G53/00

Abstract: To provide a method of forming a positive electrode active material with high productivity. To provide a manufacturing apparatus capable of forming a positive electrode active material with high productivity. Provided is a method of forming a positive electrode active material including lithium, a transition metal, oxygen, and fluorine. An adhesion preventing step is performed during heating of an object. Examples of the adhesion preventing step include stirring by rotating a furnace during the heating, stirring by vibrating a container containing an object during the heating, and crushing performed between the plurality of heating steps. By these manufacturing methods, a positive electrode active material having favorable distribution of an additive at the surface portion can be formed.