Patents by Inventor Yohei Momma

Yohei Momma has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20240063387
    Abstract: A positive electrode active material having a high charge-discharge capacity and high safety and a secondary battery including the positive electrode active material are provided. The positive electrode active material includes lithium, a transition metal M, an additive element, and oxygen. The powder volume resistivity of the positive electrode active material is higher than or equal to 1.0×105 ?·cm at a temperature of higher than or equal to 180° C. and lower than or equal to 200° C. and at a pressure of higher than or equal to 0.3 MPa and lower than or equal to 2 MPa. The median diameter of the positive electrode active material is preferably greater than or equal to 3 ?m and less than or equal to 10 ?m.
    Type: Application
    Filed: August 14, 2023
    Publication date: February 22, 2024
    Inventors: Shunpei YAMAZAKI, Tetsuya KAKEHATA, Shuhei YOSHITOMI, Yohei MOMMA, Atsushi KAWATSUKI, Mayumi MIKAMI, Junya MARUYAMA, Akio ENDO, Kaori OGITA
  • Patent number: 11901548
    Abstract: A positive electrode active material, which has a high capacity and excellent charge and discharge cycle performance, for a lithium-ion secondary battery is provided. Alternatively, a positive electrode active material that inhibits a decrease in capacity in charge and discharge cycles when used in a lithium-ion secondary battery is provided. Alternatively, a high-capacity secondary battery is provided. Alternatively, a highly safe or reliable secondary battery is provided. The positive electrode active material contains a first substance including a first crack and a second substance positioned inside the first crack. The first substance contains one or more of cobalt, manganese, and nickel, lithium, oxygen, magnesium, and fluorine. The second substance contains phosphorus and oxygen.
    Type: Grant
    Filed: June 11, 2019
    Date of Patent: February 13, 2024
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Kazuhito Machikawa, Yohei Momma, Teruaki Ochiai, Mayumi Mikami
  • Publication number: 20240047691
    Abstract: A secondary battery with little deterioration is provided. A highly reliable secondary battery is provided. A positive electrode active material included in the secondary battery includes a crystal of lithium cobalt oxide. The positive electrode active material includes a first region including a surface parallel to the (00l) plane of the crystal and a second region including a surface parallel to a plane intersecting with the (00l) plane. The positive electrode active material contains magnesium. The first region includes a portion with a magnesium concentration that is higher than or equal to 0.5 atomic % and lower than or equal to 10 atomic %. The second region includes a portion with a magnesium concentration that is higher than the magnesium concentration in the first region and is higher than or equal to 4 atomic % and lower than or equal to 30 atomic %.
    Type: Application
    Filed: July 27, 2023
    Publication date: February 8, 2024
    Inventors: Jo SAITO, Yohei MOMMA, Kunihiro FUKUSHIMA, Teppei OGUNI
  • Publication number: 20240030429
    Abstract: A positive electrode active material in which the number of defects that cause deterioration is small or progress of the defect is suppressed is provided. The positive electrode active material is used for a secondary battery. The positive electrode active material contains lithium cobalt oxide containing an additive element. After a cycle test is performed on a cell that uses the positive electrode active material for a positive electrode and a lithium electrode as a counter electrode, the positive electrode active material includes a defect and contains at least the same element as the additive element in a region in the vicinity of the defect. The additive element is contained also in a surface portion of the positive electrode active material.
    Type: Application
    Filed: October 28, 2021
    Publication date: January 25, 2024
    Inventors: Shunpei YAMAZAKI, Ryo ARASAWA, Shunichi ITO, Shiori SAGA, Yohei MOMMA, Jo SAITO, Kunihiko SUZUKI, Teppei OGUNI, Yuji IWAKI, Kanta ABE
  • Patent number: 11881578
    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.
    Type: Grant
    Filed: December 21, 2022
    Date of Patent: January 23, 2024
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Takahiro Kawakami, Yohei Momma, Teruaki Ochiai, Tatsuya Ikenuma
  • Patent number: 11843113
    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.
    Type: Grant
    Filed: December 4, 2019
    Date of Patent: December 12, 2023
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Takahiro Kawakami, Teruaki Ochiai, Yohei Momma, Ayae Tsuruta, Masahiro Takahashi, Mayumi Mikami
  • Publication number: 20230361290
    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.
    Type: Application
    Filed: June 21, 2023
    Publication date: November 9, 2023
    Inventors: Takahiro KAWAKAMI, Teruaki OCHIAI, Shuhei YOSHITOMI, Takuya HIROHASHI, Mako MOTOYOSHI, Yohei MOMMA, Junya GOTO
  • Publication number: 20230361267
    Abstract: To provide a positive electrode active material with which the cycle performance of a secondary battery can be improved and a manufacturing method thereof. When a secondary battery is fabricated using, for a positive electrode, a positive electrode active material obtained by depositing a solid electrolyte on a lithium compound with the use of a graphene compound by spray-drying treatment and volatilizing carbon from the graphene compound by heat treatment, the decomposition of an electrolyte solution in contact with the positive electrode active material can be inhibited, contributing to improvement in the cycle performance of the secondary battery.
    Type: Application
    Filed: July 13, 2023
    Publication date: November 9, 2023
    Applicant: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Yohei Momma, Mayumi MIKAMI, Aya UCHIDA, Kazuhito MACHIKAWA
  • Publication number: 20230343924
    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.
    Type: Application
    Filed: May 30, 2023
    Publication date: October 26, 2023
    Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
    Inventors: Teruaki OCHIAI, Takahiro KAWAKAMI, Mayumi MIKAMI, Yohei MOMMA, Masahiro TAKAHASHI, Ayae TSURUTA
  • Publication number: 20230343952
    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 positive electrode active material that hardly deteriorates is provided. The positive electrode active material is formed through a plurality of heating steps. The second and subsequent heating steps are preferably performed at a temperature higher than or equal to 742° C. and lower than or equal to 920° C. for longer than or equal to an hour and shorter than or equal to 10 hours. Through the heating, magnesium, fluorine, and the like are distributed in a surface portion of the positive electrode active material with preferable concentrations. The crystal structure of general lithium cobalt oxide is easily broken because it becomes the H1-3 phase type crystal structure when being charged at 4.
    Type: Application
    Filed: June 15, 2021
    Publication date: October 26, 2023
    Inventors: Yohei MOMMA, Mayumi MIKAMI, Teruaki OCHIAI
  • Patent number: 11799080
    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.
    Type: Grant
    Filed: May 11, 2018
    Date of Patent: October 24, 2023
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Mayumi Mikami, Aya Uchida, Yumiko Yoneda, Yohei Momma, Masahiro Takahashi, Teruaki Ochiai
  • Publication number: 20230335733
    Abstract: A conduction path in an all-solid-state secondary battery is difficult to keep with a volume change in an active material due to charging and discharging in some cases. A positive electrode active material with a small volume change between the charged state and the discharged state is used for an all-solid-state secondary battery. For example, a positive electrode active material that has a layered rock-salt crystal structure in the discharged state and a crystal structure similar to the cadmium chloride type crystal structure in the charged state with a depth of charge of approximately 0.8 changes less in its volume and crystal structure between charging and discharging than known positive electrode active materials.
    Type: Application
    Filed: April 25, 2023
    Publication date: October 19, 2023
    Inventors: Mayumi MIKAMI, Yohei MOMMA, Kazutaka KURIKI, Kazuhei NARITA
  • Publication number: 20230327088
    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.
    Type: Application
    Filed: June 1, 2023
    Publication date: October 12, 2023
    Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
    Inventors: Takahiro KAWAKAMI, Teruaki OCHIAI, Yohei MOMMA, Ayae TSURUTA, Masahiro Takahashi, Mayumi MIKAMI
  • Publication number: 20230327073
    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.
    Type: Application
    Filed: May 30, 2023
    Publication date: October 12, 2023
    Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
    Inventors: Teruaki OCHIAI, Takahiro KAWAKAMI, Mayumi MIKAMI, Yohei MOMMA, Masahiro TAKAHASHI, Ayae TSURUTA
  • Publication number: 20230327095
    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.
    Type: Application
    Filed: June 1, 2023
    Publication date: October 12, 2023
    Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
    Inventors: Yohei MOMMA, Takahiro KAWAKAMI, Teruaki OCHIAI, Masahiro TAKAHASHI
  • Publication number: 20230327075
    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.
    Type: Application
    Filed: June 1, 2023
    Publication date: October 12, 2023
    Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
    Inventors: Teruaki OCHIAI, Takahiro KAWAKAMI, Mayumi MIKAMI, Yohei MOMMA, Masahiro TAKAHASHI, Ayae TSURUTA
  • Publication number: 20230317940
    Abstract: A secondary battery and a positive electrode active material each having high energy density per weight and per volume are provided. The secondary battery includes a positive electrode, the positive electrode includes lithium cobalt oxide, and the lithium cobalt oxide has a projection containing at least one or two or more selected from Hf, V, Nb, Ce, and Sm. The projection may further contain Mg, F, Ni, or Al as an additive element. The secondary battery is manufactured through a step of forming a mixed solution by mixing the lithium cobalt oxide and a metal alkoxide containing one or two or more selected from Hf, V, Nb, Ce, and Sm. With such a positive electrode active material, a secondary battery with a high charge voltage can be provided.
    Type: Application
    Filed: July 26, 2021
    Publication date: October 5, 2023
    Applicant: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Jo Saito, Yohei MOMMA, Teruaki OCHIAI, Yusuke YOSHITANI, Mayumi MIKAMI
  • Patent number: 11777089
    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.
    Type: Grant
    Filed: April 26, 2022
    Date of Patent: October 3, 2023
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Mayumi Mikami, Aya Uchida, Yumiko Yoneda, Yohei Momma, Masahiro Takahashi, Teruaki Ochiai
  • Publication number: 20230307634
    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.
    Type: Application
    Filed: March 27, 2023
    Publication date: September 28, 2023
    Inventors: Jo SAITO, Kaori OGITA, Yohei MOMMA, Kazutaka KURIKI, Shuhei YOSHITOMI, Yasuhiro JINBO, Tetsuya KAKEHATA, Shunpei YAMAZAKI
  • Publication number: 20230307628
    Abstract: A positive electrode active material having a crystal structure that is unlikely to be broken by repeated charging and discharging is provided. A positive electrode active material with high charge and discharge capacity is provided. A projection is provided on the surface of the positive electrode active material. The projection preferably contains zirconium and yttrium and is a rectangular solid. The projection preferably has a crystal structure that is tetragonal, cubic, or a mixture of two phases, tetragonal and cubic. In the positive electrode active material, the transition metal is one or two or more selected from cobalt, nickel, and manganese, and the additive elements are at least two or more selected from magnesium, fluorine, aluminum, zirconium, and yttrium.
    Type: Application
    Filed: July 28, 2021
    Publication date: September 28, 2023
    Inventors: Jo SAITO, Yohei MOMMA, Teruaki OCHIAI, Yusuke YOSHITANI, Kanta ABE, Kazuki TANEMURA, Shunpei YAMAZAKI