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公开(公告)号：US09825297B2
公开(公告)日：2017-11-21
申请号：US14893029
申请日：2014-05-22
Inventor： Akira Kano , Nobuhiko Hojo , Masahisa Fujimoto
IPC: H01M4/587 , H01M4/133 , H01M10/054 , C01B31/02 , H01M4/02
CPC classification number: H01M4/587 , C01B32/05 , H01M10/054 , H01M2004/021 , H01M2004/027
Abstract: A negative-electrode active material for a sodium-ion secondary battery contains a porous carbon material which has a plurality of open pores that extend through to the surface, a plurality of closed pores that do not extend through to the surface, and a solid made of carbon material. The distance between (002) planes of the solid portion is not less than 0.340 nm and not more than 0.410 nm. The plurality of closed pores account for a volume ratio of not less than 0% and not more than 10% with respect to a total volume of the plurality of open pores, the plurality of closed pores, and the solid portion. The plurality of open pores account for a volume ratio of not less than 0% and not more than 50% with respect to a total volume of the plurality of open pores, the plurality of closed pores, and the solid portion.
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公开(公告)号：US09755237B2
公开(公告)日：2017-09-05
申请号：US14893027
申请日：2014-05-22
Inventor： Akira Kano , Nobuhiko Hojo , Masahisa Fujimoto
CPC classification number: H01M4/587 , C01B32/00 , C01B32/05 , C01B32/30 , C01B32/318 , H01M4/133 , H01M10/054 , H01M2004/021 , H01M2004/027
Abstract: A negative-electrode active material for a sodium-ion secondary battery contains a porous carbon material which has a plurality of open pores that extend through to the surface, a plurality of closed pores that do not extend through to the surface, and a solid portion made of carbon material. The distance between (002) planes of carbon in at least a part of the solid portion is 0.36 nm or more. The plurality of closed pores account for a volume ratio of not less than 30% and not more than 90% with respect to a total volume of the plurality of open pores, the plurality of closed pores, and the solid portion.
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公开(公告)号：US09728784B2
公开(公告)日：2017-08-08
申请号：US14569304
申请日：2014-12-12
Inventor： Kiyohiro Hine , Naomi Nishiki , Akira Kano , Masahisa Fujimoto
IPC: H01M4/88 , H01M4/587 , C01B31/04 , H01M10/054 , H01M4/02
CPC classification number: H01M4/587 , C01B32/20 , C01B32/205 , H01M10/054 , H01M2004/021
Abstract: A method for producing a vitreous carbon material which can serve as a carbon material for a power storage device. In the method, a polymer material, having six-membered ring structures in its basic carbon skeleton and having a nitrogen atom, is heated at a temperature of 1000° C. to 2100° C. under an inert gas environment, and then, the polymer material is pulverized, to thereby control graphitization and crystal growth of the carbon material, thus producing a vitreous carbon material which serves as a carbon material for a power storage device.
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公开(公告)号：US20250167307A1
公开(公告)日：2025-05-22
申请号：US18841780
申请日：2023-02-20
Inventor： Akira Kano , Takahiro Inoue
IPC: H01M10/0587 , H01M10/0525
Abstract: Disclosed is a non-aqueous electrolyte secondary battery including: a wound electrode group 10 in which a positive electrode 11 and a negative electrode 12 are spirally wound in a winding direction with a separator 13 interposed therebetween; and a non-aqueous electrolyte. The negative electrode 12 includes a reverse winding portion 12A at an end of the wound electrode group 10 at a starting side of winding, the reverse winding portion 12A being a portion that does not oppose the positive electrode 11 and is spirally wound in a direction opposite to the winding direction.
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公开(公告)号：US20250070255A1
公开(公告)日：2025-02-27
申请号：US18714368
申请日：2022-11-25
Inventor： Shoshi Terada , Akira Kano
IPC: H01M10/0569 , H01M10/0525
Abstract: A lithium secondary battery includes positive and negative electrodes, and a nonaqueous electrolyte having lithium-ion conductivity. In the lithium secondary battery, lithium metal deposits on the negative electrode during charging, and the lithium metal dissolves from the negative electrode during discharging. The nonaqueous electrolyte contains a lithium salt, and a solvent. The solvent includes a first solvent: a chain ether containing no fluorine element, a second solvent: a chain fluorinated ether having a fluorination rate of 60% or more, and a third solvent: a fluorinated ether having a fluorination rate of more than 0% and less than 60%. When the number of moles of the first solvent contained in the nonaqueous electrolyte is M1, and the number of moles of the third solvent contained in the nonaqueous electrolyte is M3, a molar ratio M1/M3 is 0.25 or more and less than 3.
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Patent Agency Ranking
公开(公告)号：US20240347864A1
公开(公告)日：2024-10-17
申请号：US18292678
申请日：2022-07-27
Inventor： Shinichiro Kondo , Ryohei Miyamae , Akira Kano
IPC: H01M50/477 , H01M10/0525 , H01M10/0587 , H01M50/474 , H01M50/486
CPC classification number: H01M50/477 , H01M10/0525 , H01M10/0587 , H01M50/474 , H01M50/486
Abstract: A lithium secondary battery includes a positive electrode, a negative electrode facing the positive electrode, a separator disposed between the positive electrode and the negative electrode, a nonaqueous electrolyte having lithium ion conductivity, and a spacer disposed between the negative electrode and the separator. Lithium metal deposits on the negative electrode during charging and the lithium metal dissolves from the negative electrode during discharging. The spacer has a plurality of spot-like projection portions.
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公开(公告)号：US20240021907A1
公开(公告)日：2024-01-18
申请号：US18037228
申请日：2021-11-25
Inventor： Chifumi Murayama , Hirotaka Ogino , Akira Kano
IPC: H01M10/653 , H01M50/213 , H01M50/474 , H01M10/0568 , H01M10/643
CPC classification number: H01M10/653 , H01M50/213 , H01M50/474 , H01M10/0568 , H01M10/643 , H01M10/052
Abstract: A battery module, including: a plurality of lithium secondary batteries aligned side by side; and a heat absorbing material disposed in contact with side surfaces of the plurality of lithium secondary batteries, wherein the lithium secondary battery includes an electrode plate group, a non-aqueous electrolyte having lithium ion conductivity, and a battery case housing the electrode plate group and the non-aqueous electrolyte, the electrode plate group includes a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode, and at the negative electrode, a lithium metal deposits during charge and the lithium metal dissolves during discharge. This can suppress the increase in battery temperature in the event of abnormality.
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公开(公告)号：US20230378792A1
公开(公告)日：2023-11-23
申请号：US18028360
申请日：2021-09-10
Inventor： Takahiro Fukuoka , Akira Kano
CPC classification number: H02J7/00712 , H01M10/46 , H01M10/44
Abstract: A method of charging a lithium secondary battery including: a step of charging the lithium secondary battery based on any of a first charging profile and a second charging profile, wherein the first charging profile includes at least two charging steps, the second charging profile includes more charging steps than the first charging profile, at a starting point of the step of charging the secondary battery, the first charging profile is selected when the secondary battery has a depth of discharge of less than a predetermined threshold, and the second charging profile is selected when the secondary battery has a depth of discharge of the threshold or more.
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公开(公告)号：US20230361367A1
公开(公告)日：2023-11-09
申请号：US17802195
申请日：2021-02-18
Inventor： Takahiro Fukuoka , Akira Kano
IPC: H01M10/44 , H01M4/04 , H01M4/525 , H01M4/66 , H01M10/0525
CPC classification number: H01M10/448 , H01M4/0404 , H01M4/525 , H01M4/662 , H01M10/0525 , H01M2004/028
Abstract: A charging and discharging method for a non-aqueous electrolyte secondary battery. The battery includes a positive electrode, a negative electrode including a negative electrode current collector, and a non-aqueous electrolyte, in which a lithium metal deposits on the negative electrode during charge, and the lithium metal dissolves in the non-aqueous electrolyte during discharge. The method includes a charging step, and a discharging step performed after the charging step. The charging step includes a first step of performing a constant-current charging at a first current I1 having a current density of 1.0 mA/cm2 or less, and a second step of performing a constant-current charging at a second current I2 larger that the first current I1, after the first step. In the discharging step, an amount of electricity corresponding to 20% or more and 80% or less of a full charge amount is discharged.
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公开(公告)号：US20220407047A1
公开(公告)日：2022-12-22
申请号：US17638545
申请日：2020-07-28
Inventor： Akira Kano , Ryohei Miyamae
IPC: H01M4/134 , H01M4/62 , H01M10/0569 , H01M10/0525
Abstract: A lithium secondary battery includes a positive electrode, a negative electrode, a lithium ion conductive nonaqueous electrolyte, and a separator disposed between the positive electrode and the negative electrode. On the negative electrode, lithium metal deposits during charging, and the lithium metal is dissolved during discharging; the negative electrode includes a negative electrode current collector, and a plurality of layers stacked on the negative electrode current collector; the plurality of layers include a first layer, a second layer, and a third layer; of the first to third layers, the first layer is closest to the negative electrode current collector, and the third layer is farthest from the negative electrode current collector; the first layer contains a material capable of storing lithium ions; the second layer contains lithium metal, and the third layer has an insulation property and a lithium ion permeability.
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