公开(公告)号：US20240413342A1

公开(公告)日：2024-12-12

申请号：US18810764

申请日：2024-08-21

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Tatsuya IKENUMA ,  Takahiro KAWAKAMI ,  Yohei MOMMA ,  Teruaki OCHIAI

IPC: H01M4/62 ,  H01M4/04 ,  H01M4/139 ,  H01M10/052

Abstract: In manufacture of a storage battery electrode containing graphene as a conductive additive, the efficiency of reduction of graphene oxide under mild conditions is increased, and cycle characteristics and rate characteristics of a storage battery are improved. Provided is a manufacturing method of a storage battery electrode. In the manufacturing method, a first mixture containing an active material, graphene oxide, and a solvent is formed; a reducing agent is added to the first mixture and the graphene oxide is reduced to form a second mixture; a binder is mixed with the second mixture to form a third mixture; and the third mixture is applied to a current collector and the solvent is evaporated to form an active material layer.

公开(公告)号：US20240186486A1

公开(公告)日：2024-06-06

申请号：US18442450

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：US20230343924A1

公开(公告)日：2023-10-26

申请号：US18203148

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: H01M4/1315 ,  H01M4/134 ,  H01M4/36 ,  H01M4/525 ,  H01M4/1391 ,  H01M4/62 ,  H01M4/13915 ,  H01M4/131 ,  H01M4/86

CPC classification number: H01M4/131 ,  H01M4/1315 ,  H01M4/134 ,  H01M4/1391 ,  H01M4/13915 ,  H01M4/366 ,  H01M4/525 ,  H01M4/625 ,  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：US20230317940A1

公开(公告)日：2023-10-05

申请号：US18019563

申请日：2021-07-26

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Jo Saito ,  Yohei MOMMA ,  Teruaki OCHIAI ,  Yusuke YOSHITANI ,  Mayumi MIKAMI

IPC: H01M4/525 ,  H01M10/0525 ,  H01M4/04 ,  H01M10/0587

CPC classification number: H01M4/525 ,  H01M10/0525 ,  H01M4/0471 ,  H01M4/0416 ,  H01M10/0587 ,  H01M2220/20 ,  H01M2004/028

Abstract: A secondary battery and a positive electrode active material each having high energy density per weight and per volume are provided. The secondary battery includes a positive electrode, the positive electrode includes lithium cobalt oxide, and the lithium cobalt oxide has a projection containing at least one or two or more selected from Hf, V, Nb, Ce, and Sm. The projection may further contain Mg, F, Ni, or Al as an additive element. The secondary battery is manufactured through a step of forming a mixed solution by mixing the lithium cobalt oxide and a metal alkoxide containing one or two or more selected from Hf, V, Nb, Ce, and Sm. With such a positive electrode active material, a secondary battery with a high charge voltage can be provided.

公开(公告)号：US20230299265A1

公开(公告)日：2023-09-21

申请号：US18202480

申请日：2023-05-26

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：US20220255076A1

公开(公告)日：2022-08-11

申请号：US17729170

申请日：2022-04-26

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：US20220199984A1

公开(公告)日：2022-06-23

申请号：US17690057

申请日：2022-03-09

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Yohei MOMMA ,  Takahiro KAWAKAMI ,  Teruaki OCHIAI ,  Masahiro TAKAHASHI

IPC: H01M4/36 ,  H01M10/0525 ,  H01M4/525 ,  H01M4/62 ,  C01G51/00

Abstract: Provided is a positive electrode active material for a lithium ion secondary battery having favorable cycle characteristics and high capacity. A covering layer containing aluminum and a covering layer containing magnesium are provided on a superficial portion of the positive electrode active material. The covering layer containing magnesium exists in a region closer to a particle surface than the covering layer containing aluminum is. The covering layer containing aluminum can be formed by a sol-gel method using an aluminum alkoxide. The covering layer containing magnesium can be formed as follows: magnesium and fluorine are mixed as a starting material and then subjected to heating after the sol-gel step, so that magnesium is segregated.

公开(公告)号：US20220190332A1

公开(公告)日：2022-06-16

申请号：US17442195

申请日：2020-03-23

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

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

IPC: H01M4/525 ,  H01M4/04 ,  C01G51/00 ,  H01G11/86 ,  H01G11/50

Abstract: A method for forming a positive electrode active material of a lithium ion secondary battery is provided. In the method for forming a positive electrode active material, a first container that includes a mixture of lithium oxide, fluoride, and a magnesium compound and fluoride that is outside the first container are provided in a heating furnace, and the heating furnace is heated at a temperature higher than or equal to a temperature at which the fluoride is volatilized or sublimated. It is further preferable that the fluoride be lithium fluoride and the magnesium compound be magnesium fluoride.

公开(公告)号：US20220181619A1

公开(公告)日：2022-06-09

申请号：US17601250

申请日：2020-03-30

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

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

IPC: H01M4/525 ,  H01M4/36 ,  H01M4/04 ,  H01M4/505 ,  H01M4/58

Abstract: Provided is a positive electrode active material that achieves improvement in load resistance such as rate performance and output resistance when used as a positive electrode active material in a lithium-ion secondary battery, achieves improvement in powder properties, has a short manufacturing cycle time, and is low in cost. The positive electrode active material is manufactured by a first step of forming a first mixture by separately pulverizing a compound containing one or more elements selected from magnesium, calcium, zirconium, lanthanum, and barium; a compound containing halogen and an alkali metal; and a fluoride containing one or more metals selected from nickel, aluminum, manganese, titanium, vanadium, iron, and chromium, and then mixing them with metal oxide powder; and a second step of performing heating at a temperature higher than or equal to 700° C. and lower than or equal to 950° C.

公开(公告)号：US20220059830A1

公开(公告)日：2022-02-24

申请号：US17274880

申请日：2019-09-17

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

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

IPC: H01M4/505 ,  C01G53/00 ,  H01M4/525 ,  H01M4/36 ,  H01M10/0525 ,  H01M50/204 ,  H01M50/249

Abstract: A positive electrode material for a lithium-ion secondary battery which has high capacity and excellent charge and discharge cycle performance, and a manufacturing method thereof are provided, or a method of manufacturing a positive electrode material with high productivity is provided. The positive electrode material for a lithium-ion secondary battery includes a crystal represented by a crystal structure with a space group R-3m, a first region, and a second region, which is in contact with at least part of an outer side of the first region and whose outer edge corresponds to a surface of the first particle. The ratio of manganese atoms to cobalt atoms in the first region is lower than the ratio of manganese atoms to cobalt atoms in the second region. The ratio of fluorine atoms to oxygen atoms in the first region is lower than the ratio of fluorine atoms to oxygen atoms in the second region.