公开(公告)号：US20200373567A1

公开(公告)日：2020-11-26

申请号：US16917190

申请日：2020-06-30

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

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

IPC: H01M4/46 ,  H01M10/0525 ,  H01M4/131 ,  H01M4/62 ,  H01M4/36 ,  H01M4/1391

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：US20200350576A1

公开(公告)日：2020-11-05

申请号：US16934201

申请日：2020-07-21

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

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

IPC: H01M4/505 ,  H01M4/36 ,  H01M4/131 ,  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：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：US20200313177A1

公开(公告)日：2020-10-01

申请号：US16900108

申请日：2020-06-12

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

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

IPC: H01M4/46 ,  H01M4/1391 ,  H01M4/62 ,  H01M4/36 ,  H01M4/131 ,  H01M10/0525

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：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：US20200076223A1

公开(公告)日：2020-03-05

申请号：US16610931

申请日：2018-05-11

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Kazutaka KURIKI ,  Ryota TAJIMA ,  Hideaki SHISHIDO ,  Yusuke YOSHITANI ,  Haruki KATAGIRI ,  Yohei MOMMA

IPC: H02J7/04 ,  H02J7/02 ,  H02J7/00 ,  H02J50/20 ,  H02J50/80 ,  B60L53/12 ,  B60L50/60 ,  B60L53/62 ,  G05B13/02 ,  H01M10/46 ,  H01M10/44

Abstract: A charging control device using machine learning is provided. A high-security charging control device is provided. A charging control system with little deterioration is provided. A storage battery having excellent characteristics is provided.An approximate charging end time is calculated. A result obtained when it is different from the estimated charging end time is fed back and learned, and accordingly the charging end can be precisely estimated after the next time. That is, the portable information terminal makes a charging plan with the use of artificial intelligence and the secondary battery is charged based on information about the charging plan. The charging plan is made to reduce the retention time of the full charging (SOC 100%) and charging is executed. Charging history information is stored in the portable information terminal and made use of to make the next charging plan.

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：US20170352864A1

公开(公告)日：2017-12-07

申请号：US15538049

申请日：2015-12-25

Applicant: Semiconductor Energy Laboratory Co., Ltd.

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

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

CPC classification number: H01M4/0404 ,  H01M4/0471 ,  H01M4/13 ,  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：US20160248077A1

公开(公告)日：2016-08-25

申请号：US15046877

申请日：2016-02-18

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Junpei MOMO ,  Yohei MOMMA

IPC: H01M4/04 ,  H01M4/485 ,  H01M4/587 ,  H01M10/0525

CPC classification number: H01M4/0452 ,  H01M4/485 ,  H01M4/587 ,  H01M10/0525 ,  H01M2220/30

Abstract: A lithium-ion secondary battery having stable charge characteristics and lifetime characteristics is manufactured. Before the secondary battery is completed, a positive electrode is subjected to an electrochemical reaction in a large amount of electrolyte solution in advance, so that the positive electrode can have stability. The use of the positive electrode enables the secondary battery to be highly reliable. If a negative electrode is also subjected to an electrochemical reaction in a large amount of electrolyte solution in advance, the secondary battery can be more highly reliable.

Abstract translation: 制造具有稳定的电荷特性和寿命特性的锂离子二次电池。 在二次电池完成之前，预先使正极在大量的电解液中进行电化学反应，使正极具有稳定性。 使用正极使二次电池具有高可靠性。 如果负极也预先在大量的电解液中进行电化学反应，则二次电池可以更加可靠。