公开(公告)号：US20240421445A1

公开(公告)日：2024-12-19

申请号：US18718903

申请日：2022-12-02

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Tatsuyoshi TAKAHASHI ,  Ryota TAJIMA ,  Kazutaka KURIKI ,  Mayumi MIKAMI

IPC: H01M50/533 ,  H01M50/105 ,  H01M50/178

Abstract: To provide a battery in which electrode distortion is suppressed in connecting an electrode terminal and a current collector exposed portion. The battery includes an electrode, an exterior body surrounding the electrode, and a lead extending from the inside to the outside of the exterior body. The electrode includes a current collector and an active material layer. The electrode includes a first region where the active material layer is provided over the current collector, and a second region where the current collector is exposed. The second region of the electrode includes a third region where the current collector is folded. The lead is connected to the electrode in the third region.

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：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：US20230246198A1

公开(公告)日：2023-08-03

申请号：US17766336

申请日：2020-09-29

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Kaori OGITA ,  Hiroshi KADOMA ,  Tomoya HIROSE ,  Yumiko YONEDA ,  Yuji IWAKI ,  Tatsuyoshi TAKAHASHI ,  Shunpei YAMAZAKI ,  Mayumi MIKAMI ,  Kazuki TANEMURA

IPC: H01M4/62 ,  H01M4/525 ,  H01M4/131 ,  H01M10/0525

CPC classification number: H01M4/628 ,  H01M4/525 ,  H01M4/131 ,  H01M10/0525 ,  H01M2004/028

Abstract: A positive electrode for a secondary battery having excellent cycle performance is provided. The positive electrode for a secondary battery includes a positive electrode current collector layer, a base film, a positive electrode active material layer, and a cap layer; the base film contains titanium nitride; the positive electrode active material layer contains lithium cobalt oxide; and the cap layer contains titanium oxide. The use of titanium nitride for the base film can inhibit oxidation of the positive electrode current collector and diffusion of metal atoms while ensuring an adequate conductivity. The use of titanium oxide for the cap layer can inhibit a side reaction between the positive electrode active material layer and an electrolyte and collapse of a crystal structure of the electrode active material, improving the cycle performance.

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.

公开(公告)号：US20220416239A1

公开(公告)日：2022-12-29

申请号：US17780049

申请日：2020-11-26

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Kazutaka KURIKI ,  Yumiko YONEDA ,  Mayumi MIKAMI ,  Hiroshi KADOMA ,  Kunihiko SUZUKI ,  Shunpei YAMAZAKI

IPC: H01M4/525 ,  H01M10/0525 ,  H01M4/505 ,  H01M4/583 ,  H01M10/0567

Abstract: A secondary battery that can withstand at least high temperature is achieved by designing the structure of the secondary battery. The secondary battery uses: a positive electrode active material obtained by a formation method including a first step of forming a first mixture by pulverizing magnesium fluoride, lithium fluoride, a nickel source, and an aluminum source and then mixing the pulverized materials with powder of lithium cobalt oxide, and a second step of forming a second mixture by heating the first mixture at a temperature lower than an upper temperature limit of the lithium cobalt oxide; and an electrolyte solution to which LiBOB is added.

公开(公告)号：US20220263089A1

公开(公告)日：2022-08-18

申请号：US17729236

申请日：2022-04-26

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

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

IPC: H01M4/525 ,  C01G51/00 ,  C01G53/00 ,  H01M4/505 ,  H01M10/0525 ,  H01M10/0568 ,  H01M10/0569

Abstract: A positive electrode active material, which has higher capacity and excellent charge and discharge cycle performance, for a lithium-ion secondary battery is provided. The positive electrode active material includes lithium, cobalt, magnesium, oxygen, and fluorine; when a pattern obtained by powder X ray diffraction using a CuKα1 ray is subjected to Rietveld analysis, the positive electrode active material has a crystal structure having a space group R-3m, a lattice constant of an a-axis is greater than 2.814×10(−10th power) m and less than 2.817×10(−10th power) m, and a lattice constant of a c-axis is greater than 14.05×10(−10th power) m and less than 14.07×10(−10th power) m; and in analysis by X-ray photoelectron spectroscopy, a relative value of a magnesium concentration is higher than or equal to 1.6 and lower than or equal to 6.0 with the cobalt concentration regarded as 1.

公开(公告)号：US20220246931A1

公开(公告)日：2022-08-04

申请号：US17727300

申请日：2022-04-22

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

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

IPC: H01M4/525 ,  C01G51/00 ,  C01G53/00 ,  H01M4/505 ,  H01M10/0525 ,  H01M10/0568 ,  H01M10/0569

Abstract: A positive electrode active material, which has higher capacity and excellent charge and discharge cycle performance, for a lithium-ion secondary battery is provided. The positive electrode active material includes lithium, cobalt, magnesium, oxygen, and fluorine; when a pattern obtained by powder X ray diffraction using a CuKα1 ray is subjected to Rietveld analysis, the positive electrode active material has a crystal structure having a space group R-3m, a lattice constant of an a-axis is greater than 2.814×10(−10th power) m and less than 2.817×10(−10th power) m, and a lattice constant of a c-axis is greater than 14.05×10(−10th power) m and less than 14.07×10(−10th power) m; and in analysis by X-ray photoelectron spectroscopy, a relative value of a magnesium concentration is higher than or equal to 1.6 and lower than or equal to 6.0 with the cobalt concentration regarded as 1.

公开(公告)号：US20210384753A1

公开(公告)日：2021-12-09

申请号：US17283689

申请日：2019-10-15

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Munehiro KOZUMA ,  Takayuki IKEDA ,  Takanori MATSUZAKI ,  Kei TAKAHASHI ,  Mayumi MIKAMI ,  Shunpei YAMAZAKI

IPC: H02J7/00 ,  G11C11/401 ,  H01M10/48 ,  H01M10/42 ,  H01M10/613 ,  H01M10/615 ,  H01M10/633 ,  H01M10/625 ,  H01M10/0525

Abstract: The safety is ensured in such a manner that with an abnormality detection system of a secondary battery, abnormality of a secondary battery is detected, for example, a phenomenon that lowers the safety of the secondary battery is detected early, and a user is warned or the use of the secondary battery is stopped. The abnormality detection system of the secondary battery determines whether the temperature of the secondary battery is within a temperature range in which normal operation can be performed on the basis of temperature data obtained with a temperature sensor. In the case where the temperature of the secondary battery is high, a cooling device is driven by a control signal from the abnormality detection system of the secondary battery. The abnormality detection system of the secondary battery includes at least a memory means. The memory means has a function of holding an analog signal and includes a transistor using an oxide semiconductor for a semiconductor layer.