公开(公告)号：US20240097194A1

公开(公告)日：2024-03-21

申请号：US18039505

申请日：2021-12-03

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Kaori OGITA ,  Kazuya SHIMADA ,  Takashi HIRAHARA ,  Fumiko TANAKA ,  Shotaro MURATSUBAKI ,  Satoshi SEO

IPC: H01M10/0569 ,  C01G53/00 ,  H01M4/525 ,  H01M10/0525 ,  H01M10/0567

CPC classification number: H01M10/0569 ,  C01G53/66 ,  H01M4/525 ,  H01M10/0525 ,  H01M10/0567 ,  C01P2002/72 ,  C01P2002/76 ,  C01P2006/40 ,  H01M2004/028

Abstract: A novel ionic liquid is provided. A highly safe secondary battery with high charge and discharge capacity is provided. The ionic liquid includes a cation represented by General Formula (G1) and an anion represented by Structural Formula (200). In the formula, X1 to X3 each independently represent any one of fluorine, chlorine, bromine, and iodine. One of X1 to X3 may be hydrogen. In addition, n and m each independently represent 0 to 5. Furthermore, a secondary battery including the above-described ionic liquid is provided.

公开(公告)号：US20220359870A1

公开(公告)日：2022-11-10

申请号：US17734744

申请日：2022-05-02

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Mayumi MIKAMI ,  Jo SAITO ,  Kazuki TANEMURA ,  Tatsuyoshi TAKAHASHI ,  Yohei MOMMA ,  Kazuya SHIMADA ,  Kunihiro FUKUSHIMA

IPC: H01M4/525

Abstract: A positive electrode active material in which a discharge capacity decrease due to charge and discharge cycles is suppressed and a secondary battery including the positive electrode active material are provided. A positive electrode active material in which a change in a crystal structure, e.g., a shift in CoO2 layers is small between a discharged state and a high-voltage charged state is provided. For example, a positive electrode active material that has a layered rock-salt crystal structure belonging to the space group R-3m in a discharged state and a crystal structure belonging to the space group P2/m in a charged state where x in LixCoO2 is greater than 0.1 and less than or equal to 0.24 is provided. When the positive electrode active material is analyzed by powder X-ray diffraction, a diffraction pattern has at least diffraction peaks at 2θ of 19.47±0.10° and 2θ of 45.62±0.05°.

公开(公告)号：US20240347760A1

公开(公告)日：2024-10-17

申请号：US18293877

申请日：2022-07-26

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Kazuya SHIMADA ,  Yohei MOMMA ,  Shuhei YOSHITOMI ,  Fumiko TANAKA ,  Kazutaka KURIKI

IPC: H01M10/0525 ,  H01M4/02 ,  H01M4/525 ,  H01M4/587 ,  H01M10/0568 ,  H01M10/44

CPC classification number: H01M10/0525 ,  H01M4/525 ,  H01M4/587 ,  H01M10/0568 ,  H01M10/443 ,  H01M2004/021

Abstract: A lithium ion battery having an excellent discharge characteristics even at temperatures below freezing is to be provided. The lithium ion battery includes a positive electrode including a positive electrode active material, an electrolyte, and a negative electrode including a negative electrode active material that is a carbon material. In the lithium ion battery, a value of discharge capacity obtained by, after performing constant current charging at a charge rate of 0.1 C (where 1 C=200 mA/g) until a voltage reaches 4.5 V and then performing constant voltage charging at 4.5 V until a current value achieves 0.01 C in an environment of 25° C., performing constant current discharging at a discharge rate of 0.1 C until a voltage reaches 2.5 V in an environment of −40° C. is higher than or equal to 50% of a value of discharge capacity obtained by, after performing constant current charging at a charge rate of 0.1 C (where 1 C=200 mA/g) until a voltage reaches 4.5 V and then performing constant voltage charging at 4.5 V until a current value achieves 0.01 C in an environment of 25° C., performing constant current discharging at a discharge rate of 0.1 C until a voltage reaches 2.5V in an environment of 25° C.

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：US20250087684A1

公开(公告)日：2025-03-13

申请号：US18798072

申请日：2024-08-08

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Shuji FUKAI ,  Kazutaka KURIKI ,  Yumiko YONEDA ,  Yosiharu ASADA ,  Kazuya SHIMADA

IPC: H01M4/525 ,  C01G53/00 ,  H01M4/04 ,  H01M10/0525 ,  H01M10/0569

Abstract: A method for forming a positive electrode active material applicable to a lithium-ion battery having excellent charge and discharge characteristics even in a low-temperature environment is provided. The method for forming a positive electrode active material includes: a first step of heating lithium cobalt oxide with a median diameter of less than or equal to 10 μm; a second step of mixing a fluorine source and a magnesium source with the lithium cobalt oxide subjected to the first step, thereby forming a first mixture; a third step of heating the first mixture; a fourth step of mixing a nickel source and an aluminum source with the first mixture subjected to the third step, thereby forming a second mixture; and a fifth step of heating the second mixture. The third step and the fifth step are performed in a state where the first mixture is held to have a thickness of less than or equal to 2.0 mm in a first setter. The first step, the third step, and the fifth step are performed in an atmosphere containing oxygen.

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：US20220131146A1

公开(公告)日：2022-04-28

申请号：US17506864

申请日：2021-10-21

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Jo SAITO ,  Yohei MOMMA ,  Kunihiro FUKUSHIMA ,  Shunsuke HOSOUMI ,  Kazuki TANEMURA ,  Tetsuya KAKEHATA ,  Shunpei YAMAZAKI ,  Toshikazu OHNO ,  Mayumi MIKAMI ,  Tatsuyoshi TAKAHASHI ,  Kazuya SHIMADA

IPC: H01M4/58 ,  H01M10/0569 ,  H01M4/38 ,  H01M10/052

Abstract: The present invention relates to a secondary battery and an electronic device. The secondary battery includes a positive electrode active material which exhibits a broad peak at around 4.55 V in a dQ/dVvsV curve obtained when the charge depth is increased. The secondary battery includes a positive electrode active material which, even when the charge voltage is greater than or equal to 4.6 V and less than or equal to 4.8 V and the charge depth is greater than or equal to 0.8 and less than 0.9, does not have the H1-3 type structure and can maintain a crystal structure where a shift in CoO2 layers is inhibited. The broad peak at around 4.55 V in the dQ/dVvsV curve indicates that a change in the energy necessary for extraction of lithium at around the voltage is small and a change in the crystal structure is small. Accordingly, the positive electrode active material hardly suffers a shift in CoO2 layers and a volume change and is relatively stable even when the charge depth is large.