公开(公告)号：US20240396048A1

公开(公告)日：2024-11-28

申请号：US18697576

申请日：2022-09-26

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Yusuke YOSHITANI ,  Noriko MIYAIRI ,  Mayumi MIKAMI ,  Kazuki TANEMURA ,  Kanta ABE ,  Tatsuyoshi TAKAHASHI ,  Kenta NAKANISHI ,  Shunpei YAMAZAKI

IPC: H01M4/62 ,  H01M4/02 ,  H01M4/36 ,  H01M4/525 ,  H01M4/58

Abstract: A secondary battery includes a positive electrode active material layer including a primary particle containing lithium, nickel, cobalt, and manganese and a secondary particle formed by aggregation of the primary particles, and calcium is contained between adjacent primary particles of the secondary particle. With such a structure, calcium inhibits oxygen release from the primary particle in charging and discharging, whereby the reliability of the secondary battery is improved.

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.

公开(公告)号：US20240079583A1

公开(公告)日：2024-03-07

申请号：US18262126

申请日：2022-01-13

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Kazuya SHIMADA ,  Kousuke SASAKI ,  Takashi HIRAHARA ,  Yusuke YOSHITANI ,  Mayumi MIKAMI ,  Yohei MOMMA

IPC: H01M4/525 ,  C01G51/00

CPC classification number: H01M4/525 ,  C01G51/42 ,  C01P2002/60 ,  C01P2002/72 ,  C01P2004/03 ,  C01P2006/40 ,  H01M2004/028

Abstract: A novel method for forming a positive electrode active material is provided. The method for forming a positive electrode active material includes causing a reaction between a cobalt aqueous solution and an alkaline aqueous solution to form a cobalt compound; mixing the cobalt compound and a lithium compound and performing a first heat treatment to form a first composite oxide; mixing the first composite oxide and a compound containing a first additive element and performing a second heat treatment to form a second composite oxide; and mixing the second composite oxide and a compound containing a second additive element and performing a third heat treatment. The first heat treatment is performed at a temperature higher than or equal to 700° C. and lower than or equal to 1100° C. The second heat treatment is performed at a temperature higher than or equal to 700° C. and lower than or equal to 1000° C. The third heat treatment is performed at a temperature equal to the temperature of the second heat treatment or at a temperature lower than the temperature of the second heat treatment.

公开(公告)号：US20230361267A1

公开(公告)日：2023-11-09

申请号：US18221776

申请日：2023-07-13

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Yohei Momma ,  Mayumi MIKAMI ,  Aya UCHIDA ,  Kazuhito MACHIKAWA

IPC: H01M4/04 ,  H01M4/485 ,  H01M4/505 ,  H01M4/525 ,  H01M4/583 ,  H01M10/0525

CPC classification number: H01M4/0471 ,  H01M4/0419 ,  H01M4/485 ,  H01M4/505 ,  H01M4/525 ,  H01M4/5835 ,  H01M10/0525 ,  H01M2004/027

Abstract: To provide a positive electrode active material with which the cycle performance of a secondary battery can be improved and a manufacturing method thereof. When a secondary battery is fabricated using, for a positive electrode, a positive electrode active material obtained by depositing a solid electrolyte on a lithium compound with the use of a graphene compound by spray-drying treatment and volatilizing carbon from the graphene compound by heat treatment, the decomposition of an electrolyte solution in contact with the positive electrode active material can be inhibited, contributing to improvement in the cycle performance of the secondary battery.

公开(公告)号：US20230327075A1

公开(公告)日：2023-10-12

申请号：US18204432

申请日：2023-06-01

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 ,  H01M2004/021 ,  H01M4/134 ,  H01M4/366 ,  H01M4/525 ,  H01M4/8657 ,  H01M4/13915

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：US20230216079A1

公开(公告)日：2023-07-06

申请号：US18121065

申请日：2023-03-14

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

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

IPC: H01M4/583 ,  H01M10/0525 ,  H01M4/58 ,  H01M10/0568 ,  H01M10/0569

CPC classification number: H01M4/583 ,  H01M10/0525 ,  H01M4/5825 ,  H01M10/0568 ,  H01M10/0569 ,  H01M2004/021

Abstract: Positive electrode active material particles that inhibit a decrease in capacity due to charge and discharge cycles are provided. A high-capacity secondary battery, a secondary battery with excellent charge and discharge characteristics, or a highly-safe or highly-reliable secondary battery is provided. A novel material, active material particles, and a storage device are provided. The positive electrode active material particle includes a first region and a second region in contact with the outside of the first region. The first region contains lithium, oxygen, and an element M that is one or more elements selected from cobalt, manganese, and nickel. The second region contains the element M, oxygen, magnesium, and fluorine. The atomic ratio of lithium to the element M (Li/M) measured by X-ray photoelectron spectroscopy is 0.5 or more and 0.85 or less. The atomic ratio of magnesium to the element M (Mg/M) is 0.2 or more and 0.5 or less.

公开(公告)号：US20230207800A1

公开(公告)日：2023-06-29

申请号：US18083622

申请日：2022-12-19

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Kazuki TANEMURA ,  Yumiko YONEDA ,  Mayumi MIKAMI ,  Kazutaka KURIKI

IPC: H01M4/525 ,  H01M4/66 ,  H01M10/0525

CPC classification number: H01M4/525 ,  H01M4/667 ,  H01M4/661 ,  H01M10/0525 ,  H01M2004/028

Abstract: To provide a positive electrode active material film that does not have a (003) orientation and has a layered rock-salt crystal structure even though an inexpensive substrate such as a glass substrate is used, and a positive electrode including the positive electrode active material film. The positive electrode includes a substrate, a positive electrode current collector film, and the positive electrode active material film. The positive electrode current collector film has a stacked structure of a titanium film and a titanium nitride film. The titanium film has a crystal structure belonging to a space group P63/mmc and a (101) orientation, the titanium nitride film has a crystal structure belonging to a space group Fm-3m and a (311) orientation, and the positive electrode active material film has a layered rock-salt crystal structure and a (116) orientation.

公开(公告)号：US20230163289A1

公开(公告)日：2023-05-25

申请号：US17995374

申请日：2021-03-31

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Kunihiko SUZUKI ,  Yohei MOMMA ,  Mayumi MIKAMI ,  Tatsuyoshi TAKAHASHI ,  Yuji IWAKI

IPC: H01M4/485 ,  H01M4/04 ,  H01M4/62 ,  H01M10/0525

CPC classification number: H01M4/485 ,  H01M4/0404 ,  H01M4/625 ,  H01M10/0525 ,  H01M2004/028

Abstract: A positive electrode active material with high charge and discharge capacity is provided. A positive electrode active material with high charge and discharge voltage is provided. A secondary battery which hardly deteriorates is provided. A highly safe power storage device is provided. A novel secondary battery is provided. The positive electrode active material contains cobalt, oxygen, and fluorine and includes a bond of the cobalt and the fluorine in a surface portion or the vicinity of a grain boundary. By having the bond with fluorine, at least part of cobalt is high-spin (paramagnetic) Co2+. Thus, in ESR analysis, the spin concentration at 113 K is higher than the spin concentration at 300 K by 1.1×10−5 spins/g or more.

公开(公告)号：US20220285681A1

公开(公告)日：2022-09-08

申请号：US17750436

申请日：2022-05-23

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Mayumi MIKAMI ,  Aya UCHIDA ,  Yumiko YONEDA ,  Yohei MOMMA ,  Masahiro TAKAHASHI ,  Teruaki OCHIAI

IPC: H01M4/525 ,  C01G53/00 ,  H01M4/131 ,  H01M4/133 ,  H01M4/134 ,  H01M4/139 ,  H01M4/36 ,  H01M4/505 ,  H01M10/0525 ,  H01M6/16

Abstract: A positive electrode active material having high capacity and excellent cycle performance is provided. The positive electrode active material has a small difference in a crystal structure between the charged state and the discharged state. For example, the crystal structure and volume of the positive electrode active material, which has a layered rock-salt crystal structure in the discharged state and a pseudo-spinel crystal structure in the charged state at a high voltage of approximately 4.6 V, are less likely to be changed by charge and discharge as compared with those of a known positive electrode active material.

公开(公告)号：US20220285673A1

公开(公告)日：2022-09-08

申请号：US17690073

申请日：2022-03-09

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

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.