公开(公告)号：US20230307634A1

公开(公告)日：2023-09-28

申请号：US18190365

申请日：2023-03-27

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Jo SAITO ,  Kaori OGITA ,  Yohei MOMMA ,  Kazutaka KURIKI ,  Shuhei YOSHITOMI ,  Yasuhiro JINBO ,  Tetsuya KAKEHATA ,  Shunpei YAMAZAKI

IPC: H01M4/525 ,  H01M10/0525 ,  H01M10/0569 ,  H01M4/131

CPC classification number: H01M4/525 ,  H01M10/0525 ,  H01M10/0569 ,  H01M4/131 ,  H01M2300/004

Abstract: A lithium ion battery having excellent charge characteristics and discharge characteristics even in a low-temperature environment is provided. The lithium ion battery includes a positive electrode active material and an electrolyte. The positive electrode active material contains cobalt, oxygen, magnesium, aluminum, and nickel. The electrolyte contains lithium hexafluorophosphate, ethylene carbonate, ethyl methyl carbonate, and dimethyl carbonate. Second discharge capacity of the lithium ion battery is higher than or equal to 70% of first discharge capacity. The first discharge capacity is obtained by performing first charge and first discharge at 20° C., and the second discharge capacity is obtained by performing second charge and second discharge at −40° C. The first discharge and the second discharge are constant current discharge with 20 mA/g per positive electrode active material weight.

公开(公告)号：US20230295005A1

公开(公告)日：2023-09-21

申请号：US18041424

申请日：2021-08-06

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Shunpei YAMAZAKI ,  Tetsuya KAKEHATA ,  Tetsuji ISHITANI ,  Yohei MOMMA

IPC: C01G51/00 ,  H01M4/525

CPC classification number: C01G51/42 ,  H01M4/525 ,  C01P2006/40 ,  C01P2002/52 ,  C01P2002/77 ,  C01P2002/72

Abstract: A method of forming a highly purified positive electrode active material is provided. A method of forming a positive electrode active material whose crystal structure is not easily broken even when charge and discharge are repeated is provided. The method of forming a positive electrode active material including lithium and a transition metal includes a first step of preparing a lithium source and a transition metal source and a second step of crushing and mixing the lithium source and the transition metal source to form a composite material. In the first step, a material with a purity of greater than or equal to 99.99% is prepared as the lithium source and a material with a purity of greater than or equal to 99.9% is prepared as the transition metal source. In the second step, crushing and mixing are performed using dehydrated acetone.

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：US20230197921A1

公开(公告)日：2023-06-22

申请号：US18085682

申请日：2022-12-21

Applicant: Semiconductor Energy Laboratory Co., Ltd.

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

IPC: H01M4/04 ,  H01M4/13 ,  H01M4/139 ,  H01M4/62

CPC classification number: H01M4/0404 ,  H01M4/13 ,  H01M4/0471 ,  H01M4/139 ,  H01M4/625 ,  H01M2220/30

Abstract: In manufacturing a storage battery electrode, a method for manufacturing a storage battery electrode with high capacity and stability is provided. As a method for preventing a mixture for forming an active material layer from becoming strongly basic, a first aqueous solution is formed by mixing an active material exhibiting basicity with an aqueous solution exhibiting acidity and including an oxidized derivative of a first conductive additive; a first mixture is formed by reducing the oxidized derivative of the first conductive additive by drying the first aqueous solution; a second mixture is formed by mixing a second conductive additive and a binder; a third mixture is formed by mixing the first mixture and the second mixture; and a current collector is coated with the third mixture. The strong basicity of the mixture for forming an active material layer is lowered; thus, the binder can be prevented from becoming gelled.

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：US20230055781A1

公开(公告)日：2023-02-23

申请号：US17759165

申请日：2021-01-19

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Yohei MOMMA ,  Toshikazu OHNO ,  Yoshihiro KOMATSU ,  Shunpei YAMAZAKI

IPC: H01M4/525 ,  H01M10/0525

Abstract: The breakage or cracking of a positive electrode active material due to pressure application, repeated charging and discharging, or the like is likely to cause dissolution of a transition metal, an excessive side reaction, and the like. With a crack, unevenness, a step, roughness, or the like on the surface of a positive electrode active material, stress tends to be concentrated on part, which easily causes breakage. By contrast, with a smooth surface and a nearly spherical shape, stress concentration is alleviated; thus, breakage is unlikely to occur. Therefore, a positive electrode active material with a smooth surface and little unevenness is formed. For example, when the positive electrode active material is subjected to image analysis using a microscope image, the median value of the solidity is larger than or equal to 0.96. Alternatively, the median value of the fractal dimension of the positive electrode active material is smaller than or equal to 1.143. Alternatively, the median value of the circularity of the positive electrode active material is larger than or equal to 0.7.

公开(公告)号：US20230051128A1

公开(公告)日：2023-02-16

申请号：US17976925

申请日：2022-10-31

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

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

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

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：US20220352510A1

公开(公告)日：2022-11-03

申请号：US17852407

申请日：2022-06-29

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

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

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

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：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.