公开(公告)号：US20210320290A9

公开(公告)日：2021-10-14

申请号：US17064724

申请日：2020-10-07

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

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

IPC: H01M4/134 ,  H01M4/131 ,  H01M4/525 ,  H01M4/36 ,  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：US20210313571A1

公开(公告)日：2021-10-07

申请号：US17264701

申请日：2019-07-24

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

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

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

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：US20210305553A1

公开(公告)日：2021-09-30

申请号：US17345565

申请日：2021-06-11

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.

公开(公告)号：US20210143404A1

公开(公告)日：2021-05-13

申请号：US17086959

申请日：2020-11-02

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Mayumi MIKAMI ,  Kazuhei NARITA ,  Teruaki OCHIAI ,  Yumiko YONEDA

IPC: H01M4/1397 ,  H01M4/04 ,  H01M4/62 ,  H01M4/58 ,  H01M10/0525 ,  H01M4/136

Abstract: A method for manufacturing a lithium-ion secondary battery more safely at a lower cost is provided. A method for manufacturing a positive electrode for a secondary battery includes a step of forming slurry by mixing graphene oxide, a binder, and a positive electrode active material in a solvent containing water; a step of applying the slurry on a positive electrode current collector; and a step of reducing graphene oxide by at least one of chemical reduction and thermal reduction. As a reducing agent for the chemical reduction, ascorbic acid can be used.

公开(公告)号：US20210083281A1

公开(公告)日：2021-03-18

申请号：US16611791

申请日：2018-05-11

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Mayumi MIKAMI ,  Aya UCHIDA ,  Yumiko YONEDA ,  Yohei MOMMA ,  Masahiro TAKAHASHI ,  Teruaki OCHIAI

IPC: H01M4/525 ,  H01M4/131 ,  H01M4/134 ,  H01M4/133 ,  H01M4/505 ,  H01M4/36 ,  H01M4/139 ,  H01M10/0525 ,  C01G53/00

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：US20180198130A1

公开(公告)日：2018-07-12

申请号：US15914612

申请日：2018-03-07

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

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

IPC: H01M4/62 ,  H01M4/04 ,  H01M4/139 ,  H01M10/052

CPC classification number: H01M4/625 ,  H01M4/0404 ,  H01M4/139 ,  H01M4/621 ,  H01M4/623 ,  H01M10/052 ,  H01M2220/30 ,  Y02E60/122 ,  Y02P70/54

Abstract: In manufacture of a storage battery electrode containing graphene as a conductive additive, the efficiency of reduction of graphene oxide under mild conditions is increased, and cycle characteristics and rate characteristics of a storage battery are improved. Provided is a manufacturing method of a storage battery electrode. In the manufacturing method, a first mixture containing an active material, graphene oxide, and a solvent is formed; a reducing agent is added to the first mixture and the graphene oxide is reduced to form a second mixture; a binder is mixed with the second mixture to form a third mixture; and the third mixture is applied to a current collector and the solvent is evaporated to form an active material layer.

公开(公告)号：US20180145368A1

公开(公告)日：2018-05-24

申请号：US15810989

申请日：2017-11-13

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

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

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

CPC classification number: H01M10/0525 ,  H01M4/02 ,  H01M4/366 ,  H01M4/485 ,  H01M4/505 ,  H01M4/525 ,  H01M2004/028 ,  Y02E60/13

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：US20170092929A1

公开(公告)日：2017-03-30

申请号：US15273131

申请日：2016-09-22

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Yohei MOMMA ,  Takahiro KAWAKAMI ,  Teruaki OCHIAI

IPC: H01M4/04 ,  H01M4/62

CPC classification number: H01M4/04 ,  H01M4/505 ,  H01M4/621 ,  H01M4/623 ,  H01M4/625 ,  H01M10/052 ,  H01M2220/30 ,  Y02E60/122 ,  Y02P70/54

Abstract: A storage battery electrode with high capacity is stably manufactured with the use of a strongly basic active material. The basicity of a mixture of a strongly basic active material and graphene oxide, the mixture subjected to heat treatment, or the mixture subjected to reduction by addition of a reducing agent is measured. Only in the case where the measured basicity falls within a predetermined range, a binder such as polyvinylidene fluoride (PVdF) is mixed to form a slurry. Thus, gelation of the binder can be prevented.

公开(公告)号：US20150155556A1

公开(公告)日：2015-06-04

申请号：US14553674

申请日：2014-11-25

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

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

IPC: H01M4/505 ,  H01M4/525

CPC classification number: H01M4/505 ,  C01G45/1228 ,  C01G53/50 ,  C01P2002/80 ,  C01P2002/85 ,  C01P2002/89 ,  C01P2004/04 ,  H01M4/366 ,  H01M4/525 ,  H01M4/5825

Abstract: To increase the amount of lithium ions that can be received in and released from a positive electrode active material to achieve high capacity and high energy density of a secondary battery. A lithium manganese oxide particle includes a first region and a second region. The valence number of manganese in the first region is lower than the valence number of manganese in the second region. The lithium manganese oxide has high structural stability and high capacity characteristics.

Abstract translation: 为了增加可以从正极活性物质接收和释放的锂离子的量，以实现二次电池的高容量和高能量密度。 锂锰氧化物颗粒包括第一区域和第二区域。 第一区域中的锰的价数低于第二区域中的锰的价数。 锂锰氧化物具有高结构稳定性和高容量特性。

公开(公告)号：US20250125349A1

公开(公告)日：2025-04-17

申请号：US18687367

申请日：2022-08-23

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Teruaki OCHIAI ,  Kazutaka KURIKI

IPC: H01M4/525 ,  H01M4/02 ,  H01M4/04 ,  H01M4/62

Abstract: A positive electrode and a secondary battery that are stable in a high potential state and/or a high temperature state are provided. Alternatively, a positive electrode and a secondary battery that have excellent cycle performance are provided. The positive electrode includes a positive electrode active material and a conductive material; at least part of a surface of the positive electrode active material is covered with the conductive material; the positive electrode active material includes lithium cobalt oxide containing magnesium, fluorine, aluminum, and nickel; the lithium cobalt oxide includes a region in which at least one or more concentrations of the magnesium, the fluorine, and the aluminum are the maximum in a surface portion; and the conductive material contains carbon. The conductive material is preferably one or more selected from carbon black, graphene, and a graphene compound.