公开(公告)号：US20210384751A1

公开(公告)日：2021-12-09

申请号：US17286088

申请日：2019-10-16

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Kei TAKAHASHI ,  Takayuki IKEDA ,  Takanori MATSUZAKI ,  Munehiro KOZUMA ,  Hiroki INOUE ,  Ryota TAJIMA ,  Yohei MOMMA ,  Mayumi MIKAMI ,  Kazutaka KURIKI ,  Shunpei YAMAZAKI

IPC: H02J7/00

Abstract: A battery control circuit with a novel structure, a battery protection circuit with a novel structure, and a power storage device including either of the battery circuits are provided. The power storage device includes a first circuit portion, a second circuit portion, a third circuit portion, and a secondary battery; the first circuit portion has a function of controlling charging of the secondary battery; the first circuit portion has a function of supplying the start time and the end time of the charging of the secondary battery to the third circuit portion; the second circuit portion has functions of generating a first voltage and a first current and supplying them to the third circuit portion; the third circuit portion has a function of generating a second voltage by charging the first current in a capacitor; and the third circuit portion has a function of comparing the first voltage and the second voltage.

公开(公告)号：US20210028456A1

公开(公告)日：2021-01-28

申请号：US17036740

申请日：2020-09-29

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

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

IPC: H01M4/525 ,  C01G51/00 ,  C01G53/00 ,  H01M10/0525

Abstract: A 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 charging and discharging as compared with those of a known positive electrode active material. In order to form the positive electrode active material having the pseudo-spinel crystal structure in the charged state, it is preferable that a halogen source such as a fluorine and a magnesium source be mixed with particles of a composite oxide containing lithium, a transition metal, and oxygen, which is synthesized in advance, and then the mixture be heated at an appropriate temperature for an appropriate time.

公开(公告)号：US20200343529A1

公开(公告)日：2020-10-29

申请号：US16923435

申请日：2020-07-08

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 ,  H01M4/86

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：US20200313228A1

公开(公告)日：2020-10-01

申请号：US16901121

申请日：2020-06-15

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Teruaki OCHIAI ,  Takahiro KAWAKAMI ,  Mayumi MIKAMI ,  Yohei MOMMA ,  Ayae TSURUTA ,  Masahiro TAKAHASHI

IPC: H01M10/0525 ,  H01M4/505 ,  H01M4/485 ,  H01M4/02 ,  H01M4/525

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：US20200176770A1

公开(公告)日：2020-06-04

申请号：US16624319

申请日：2018-06-14

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

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

IPC: H01M4/525 ,  C01G51/00 ,  C01G53/00 ,  H01M10/0525

Abstract: A 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 charging and discharging as compared with those of a known positive electrode active material. In order to form the positive electrode active material having the pseudo-spinel crystal structure in the charged state, it is preferable that a halogen source such as a fluorine and a magnesium source be mixed with particles of a composite oxide containing lithium, a transition metal, and oxygen, which is synthesized in advance, and then the mixture be heated at an appropriate temperature for an appropriate time.

公开(公告)号：US20180013130A1

公开(公告)日：2018-01-11

申请号：US15638449

申请日：2017-06-30

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Teruaki OCHIAI ,  Takahiro KAWAKAMI ,  Mayumi MIKAMI ,  Yohei MOMMA ,  Masahiro TAKAHASHI ,  Ayae TSURUTA

IPC: H01M4/131 ,  H01M4/86 ,  H01M10/0525

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：US20170170466A1

公开(公告)日：2017-06-15

申请号：US15374048

申请日：2016-12-09

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Hiroyuki MIYAKE ,  Nobuhiro INOUE ,  Ryo YAMAUCHI ,  Mako MOTOYOSHI ,  Takahiro KAWAKAMI ,  Mayumi MIKAMI ,  Miku FUJITA ,  Shunpei YAMAZAKI

IPC: H01M4/36 ,  H01M4/62 ,  H01M4/134 ,  H01M10/0525 ,  H01M4/38

CPC classification number: H01M4/366 ,  H01G11/06 ,  H01G11/28 ,  H01G11/30 ,  H01G11/36 ,  H01G11/50 ,  H01M4/134 ,  H01M4/386 ,  H01M4/626 ,  H01M10/0525

Abstract: A power storage device having high capacitance is provided. A power storage device with excellent cycle characteristics is provided. A power storage device with high charge and discharge efficiency is provided. A power storage device including a negative electrode with low resistance is provided. A negative electrode for a power storage device includes a number of composites in particulate forms. The composites include a negative electrode active material, a first functional material, and a compound. The compound includes a constituent element of the negative electrode active material and a constituent element of the first functional material. The negative electrode active material includes a region in contact with at least one of the first functional material or the compound.

公开(公告)号：US20150014605A1

公开(公告)日：2015-01-15

申请号：US14318727

申请日：2014-06-30

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Takahiro KAWAKAMI ,  Shuhei YOSHITOMI ,  Teruaki OCHIAI ,  Yumiko SAITO ,  Yohei MOMMA ,  Satoshi SEO ,  Mayumi MIKAMI ,  Shunsuke ADACHI

IPC: H01M4/505 ,  H01M4/525

CPC classification number: H01M4/505 ,  H01B1/08 ,  H01M4/362 ,  H01M4/525 ,  H01M10/052 ,  H01M10/0525 ,  H01M2004/028 ,  H01M2220/20 ,  H01M2220/30 ,  Y02E60/122

Abstract: The amount of lithium ions that can be received and released in and from a positive electrode active material is increased, and high capacity and high energy density of a secondary battery are achieved. Provided is a lithium-manganese composite oxide represented by LixMnyMzOw, where M is a metal element other than Li and Mn, or Si or P, and y, z, and w satisfy 0≦x/(y+z) 0, z>0, 0.26≦(y+z)/w

Abstract translation: 能够在正极活性物质中吸收和释放的锂离子的量增加，二次电池的高容量和高能量密度得以实现。 提供了由LixMnyMzOw表示的锂锰复合氧化物，其中M是除Li和Mn以外的金属元素，或Si或P，y，z和w满足0＆lt; nlE; x /（y + z）<2，y > 0，z> 0,0.26和nlE;（y + z）/ w <0.5和0.2

公开(公告)号：US20250140843A1

公开(公告)日：2025-05-01

申请号：US18927228

申请日：2024-10-25

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Mayumi MIKAMI ,  Jo SAITO ,  Teruaki OCHIAI ,  Masahiro TAKAHASHI ,  Tatsuyoshi TAKAHASHI ,  Yohei MOMMA ,  Kazutaka KURIKI ,  Kazune YOKOMIZO ,  Shunpei YAMAZAKI ,  Rihito WADA

IPC: H01M4/525 ,  H01M4/02 ,  H01M4/36 ,  H01M10/052 ,  H01M10/0568 ,  H01M10/0569

Abstract: To provide a positive electrode active material in which a phase transition is inhibited and a secondary battery including the positive electrode active material. An unprecedented synthesis method has been developed in which lithium cobalt oxide particles are treated with a molten salt of MgF2—LiF as a reaction accelerator to facilitate the diffusion and doping of magnesium into lithium cobalt oxide bulk and to form a stable coating layer in the particle surface portion. Ex situ XRD analysis confirms the inhibition of the harmful phase transition and the emergence of a novel phase as the modified LiCoO2 is charged up to 4.7 V. The modified LiCoO2 shows high electrochemical performance during high-voltage operation. This technology provides a guideline for suppressing fundamental degradation associated with phase transition and achieving ultra-high energy density LiCoO2 positive electrodes.

公开(公告)号：US20240396357A1

公开(公告)日：2024-11-28

申请号：US18687412

申请日：2022-08-22

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Takeshi OSADA ,  Haruki KATAGIRI ,  Kyoichi MUKAO ,  Mayumi MIKAMI ,  Kazutaka KURIKI ,  Kazuki TANEMURA

IPC: H02J7/00 ,  H01M10/42

Abstract: A secondary battery management system for achieving a secondary battery capable of being used even at low temperatures. The secondary battery management system includes a secondary battery that is charged and discharged at higher than or equal to −50° C. and lower than or equal to 0° C., a first circuit having a function of measuring a voltage of the secondary battery, a second circuit having a function of measuring a current of the secondary battery, and a control circuit to which information on voltage from the first circuit or information on current from the second circuit is input. The control circuit starts charging to the secondary battery. The control circuit performs arithmetic operation of data showing battery characteristics on the basis of a value input from the first circuit or the second circuit. The control circuit detects a local maximum value of the data. The control circuit stops the charging when detecting the local maximum value.