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：US20240243255A1

公开(公告)日：2024-07-18

申请号：US18442470

申请日：2024-02-15

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

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

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

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：US20240170993A1

公开(公告)日：2024-05-23

申请号：US18548353

申请日：2022-02-24

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Kazuki TANEMURA ,  Mayumi MIKAMI ,  Takeshi OSADA ,  Yohei MOMMA ,  Tetsuji ISHITANI ,  Haruki KATAGIRI

IPC: H02J7/04 ,  H01M4/525 ,  H01M10/44 ,  H02J7/00

CPC classification number: H02J7/04 ,  H01M4/525 ,  H01M10/443 ,  H02J7/0047 ,  H02J7/007182

Abstract: A power storage system with a high energy density is provided. A power storage system with a high degree of safety is provided. A secondary battery with a high energy density is provided. A secondary battery with a high degree of safety is provided. A charging unit has a function of controlling start and stop of charge of a secondary battery and a function of controlling a charge current of the secondary battery. The secondary battery includes a positive electrode, the positive electrode includes a positive electrode active material particle, the positive electrode active material particle is lithium cobalt oxide to which magnesium is added. The charging unit has a function of controlling charge of the secondary battery by a first step of starting constant current charge of the secondary battery at a time t1; and a second step of stopping the charge at a time t2. A crystal structure of the lithium cobalt oxide at the time t2, which is determined by powder X-ray diffraction, is a crystal structure represented by a space group R-3m.

公开(公告)号：US20240145687A1

公开(公告)日：2024-05-02

申请号：US18549274

申请日：2022-03-01

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Jo SAITO ,  Yohei MOMMA ,  Tatsuyoshi TAKAHASHI ,  Nao KUROSAWA ,  Kunihiko SUZUKI

IPC: H01M4/36 ,  H01M4/525 ,  H01M4/583 ,  H01M4/88 ,  H01M10/0525 ,  H01M10/0562

CPC classification number: H01M4/366 ,  H01M4/525 ,  H01M4/583 ,  H01M4/8882 ,  H01M10/0525 ,  H01M10/0562 ,  H01M2004/028

Abstract: A novel positive electrode active material, a novel positive electrode, and a novel lithium-ion secondary battery are to be provided. The lithium-ion secondary battery includes a positive electrode, a negative electrode, and an electrolyte. The positive electrode includes a positive electrode active material that includes a composite oxide containing lithium and cobalt. The positive electrode active material includes barium, magnesium, and aluminum in a surface portion. When being analyzed, the surface portion preferably includes a region where a first point of the highest barium concentration and a second point of the highest magnesium concentration exist closer to the surface than a third point of the highest aluminum concentration does.

公开(公告)号：US20240092658A1

公开(公告)日：2024-03-21

申请号：US18264266

申请日：2022-02-01

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Yusuke YOSHITANI ,  Takashi HIRAHARA ,  Noriko MIYAIRI ,  Masahiko HAYAKAWA ,  Yohei MOMMA

IPC: C01G53/00

CPC classification number: C01G53/50

Abstract: A positive electrode active material with high charge and discharge capacity is provided. A novel positive electrode active material is provided. The positive electrode active material is manufactured in such a manner that after a cobalt compound (also referred to as a precursor) containing nickel, cobalt, and manganese is obtained by a coprecipitation method, a mixture obtained by mixing a lithium compound and the cobalt compound is heated at a first temperature; after the mixture is ground or crushed, heating at a second temperature that is a temperature higher than the first temperature is further performed; and after an additive is mixed, third heat treatment is performed. The first temperature is higher than or equal to 400° C. and lower than or equal to 700° C. The second temperature is higher than 700° C. and lower than or equal to 1050° C.

公开(公告)号：US20230307628A1

公开(公告)日：2023-09-28

申请号：US18017893

申请日：2021-07-28

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Jo SAITO ,  Yohei MOMMA ,  Teruaki OCHIAI ,  Yusuke YOSHITANI ,  Kanta ABE ,  Kazuki TANEMURA ,  Shunpei YAMAZAKI

IPC: H01M4/525 ,  H01M4/505 ,  H01M4/62 ,  H01M4/04

CPC classification number: H01M4/525 ,  H01M4/0471 ,  H01M4/505 ,  H01M4/625 ,  H01M2004/028

Abstract: A positive electrode active material having a crystal structure that is unlikely to be broken by repeated charging and discharging is provided. A positive electrode active material with high charge and discharge capacity is provided. A projection is provided on the surface of the positive electrode active material. The projection preferably contains zirconium and yttrium and is a rectangular solid. The projection preferably has a crystal structure that is tetragonal, cubic, or a mixture of two phases, tetragonal and cubic. In the positive electrode active material, the transition metal is one or two or more selected from cobalt, nickel, and manganese, and the additive elements are at least two or more selected from magnesium, fluorine, aluminum, zirconium, and yttrium.

公开(公告)号：US20230135556A1

公开(公告)日：2023-05-04

申请号：US17906450

申请日：2021-03-17

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Kazuhei NARITA ,  Yohei MOMMA ,  Shunpei YAMAZAKI

IPC: H01M4/36 ,  H01M4/485

Abstract: A method for manufacturing a positive electrode active material with high charge and discharge capacity is provided. Alternatively, a method for manufacturing a positive electrode active material with high charge and discharge voltage is provided. Alternatively, a method for manufacturing a power storage device with little deterioration is provided. Alternatively, a method for manufacturing a highly safe power storage device is provided. Alternatively, a method for manufacturing a novel power storage device is provided. A method for manufacturing a secondary battery including a positive electrode active material is provided. A method for manufacturing the positive electrode active material includes a first step of synthesizing a first lithium source and a first transition metal source to form a first composite oxide; a second step of synthesizing an impurity source to provide an impurity layer for the first composite oxide after the first step; and a third step of synthesizing a second lithium source and a second transition metal source to form a second composite oxide after the second step and providing the second composite oxide over the first composite oxide provided with the impurity layer.

公开(公告)号：US20230129659A1

公开(公告)日：2023-04-27

申请号：US17905298

申请日：2021-03-09

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Kanta ABE ,  Yohei MOMMA ,  Yuji IWAKI ,  Shunpei YAMAZAKI

IPC: H01M4/36 ,  H01M4/525 ,  H01M4/505 ,  H01M4/58 ,  H01M10/0525 ,  C01G51/00 ,  C01G53/00

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 power storage device that hardly deteriorates is provided. A highly safe power storage device is provided. A novel power storage device is provided. A positive electrode active material containing lithium, a plurality of transition metals, oxygen, and an impurity element. The positive electrode active material includes a first region including a surface portion and a second region provided inward from the first region, and the concentration of a transition metal is higher in the first region than in the second region. An impurity region is included between the first region and the second region.

公开(公告)号：US20230052866A1

公开(公告)日：2023-02-16

申请号：US17788844

申请日：2020-12-15

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Mayumi MIKAMI ,  Jo SAITO ,  Teruaki OCHIAI ,  Yohei MOMMA ,  Yoshimi NAKASHIMA ,  Yoshiharu ASADA ,  Kazuki TANEMURA

IPC: H01M4/525 ,  H01M10/0525 ,  H01M4/36

Abstract: A positive electrode active material having a crystal structure that is unlikely to be broken by repeated charging and discharging is provided. A positive electrode active material with high charge and discharge capacity is provided. A positive electrode active material including lithium, cobalt, nickel, magnesium, and oxygen, in which the a-axis lattice constant of an outermost surface layer of the positive electrode active material is larger than the a-axis lattice constant of an inner portion and in which the c-axis lattice constant of the outermost surface layer is larger than the c-axis lattice constant of the inner portion. A rate of change between the a-axis lattice constant of the outermost surface layer and the a-axis lattice constant of the inner portion is preferably larger than 0 and less than or equal to 0.12, and a rate of change between the c-axis lattice constant of the outermost surface layer and the c-axis lattice constant of the inner portion is preferably larger than 0 and less than or equal to 0.18.

公开(公告)号：US20220371906A1

公开(公告)日：2022-11-24

申请号：US17621792

申请日：2020-06-16

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

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

IPC: C01D15/02 ,  H01M10/0525 ,  H01M4/40 ,  C01G51/00 ,  C01G53/00 ,  C01F7/162 ,  C01F7/78

Abstract: A positive electrode active material that has high capacity and excellent charge and discharge cycle performance for a secondary battery is provided. The positive electrode active material includes a group of particles including a first group of particles and a second group of particles. The group of particles includes lithium, cobalt, nickel, aluminum, magnesium, oxygen, and fluorine. When the number of cobalt atoms included in the group of particles is taken as 100, the number of nickel atoms is greater than or equal to 0.05 and less than or equal to 2, the number of aluminum atoms is greater than or equal to 0.05 and less than or equal to 2, and the number of magnesium atoms is greater than or equal to 0.1 and less than or equal to 6. When particle size distribution in the group of particles is measured by a laser diffraction and scattering method, the first group of particles has a first peak and the second group of particles has a second peak; the first peak has a local maximum value at longer than or equal to 2 μm and shorter than or equal to 4 μm, and the second peak has a local maximum value at longer than or equal to 9 μm and shorter than or equal to 25 μm.