公开(公告)号：US20220384808A1

公开(公告)日：2022-12-01

申请号：US17663383

申请日：2022-05-13

Applicant: FDK CORPORATION

Inventor： Yuki Ehara ,  Jun Ishida ,  Shota Ohata ,  Akira Saguchi ,  Masaru Kihara

IPC: H01M4/58 ,  H01M4/36 ,  H01M4/62

Abstract: A negative electrode for an alkaline storage battery that achieves both an improvement in cycle life and an improvement in low temperature discharge characteristics, and an alkaline storage battery including the negative electrode are disclosed. The negative electrode for an alkaline storage battery includes a negative electrode core body formed of metal, and a negative electrode mixture layer which contains at least a hydrogen storage alloy and yttrium fluoride, and is carried on the negative electrode core body. Particles of the yttrium fluoride are formed so that the average particle size thereof is equal to 1 μm or more and 7 μm or less.

公开(公告)号：US20220384779A1

公开(公告)日：2022-12-01

申请号：US17744647

申请日：2022-05-14

Applicant: FDK CORPORATION

Inventor： Shota Ohata ,  Akira Saguchi ,  Jun Ishida ,  Yuki Ehara ,  Masaru Kihara

IPC: H01M4/24 ,  H01M4/32 ,  H01M4/46 ,  H01M10/30 ,  H01M10/26 ,  H01M4/52

Abstract: A hydrogen absorbing alloy negative electrode is provided. The hydrogen absorbing alloy negative electrode has a hydrogen absorbing alloy, and an additive including yttrium fluoride. A mass of the yttrium fluoride is 0.1 parts by mass or more and 0.2 parts by mass or less based on a hydrogen absorbing alloy powder of 100 parts by mass.

公开(公告)号：US10693194B2

公开(公告)日：2020-06-23

申请号：US15317106

申请日：2015-06-23

Applicant: FDK CORPORATION

Inventor： Masaru Kihara ,  Akira Saguchi ,  Yusuke Shingai ,  Jun Ishida ,  Takuya Kai

IPC: H01M4/24 ,  H01M4/38 ,  H01M4/46 ,  H01M4/52 ,  H01M10/26 ,  H01M10/30 ,  H01M4/62 ,  H01M10/34

Abstract: A nickel hydrogen secondary battery accommodates an electrode group including a positive electrode and a negative electrode which are stacked one on top of another through a separator, together with an alkaline electrolyte. The battery contains Li, with a total amount of Li in the battery 2 of 15 to 50 mg/Ah, as determined as the mass in terms of LiOH per Ah of the positive electrode capacity. The negative electrode includes particles of rare earth-Mg—Ni-based hydrogen storage alloy which contains a rare earth element, Mg and Ni. The hydrogen storage alloy particles 44 includes, on the surface thereof, a rare earth hydroxide which is the hydroxide of a rare earth element and has a specific surface area of 0.1 to 0.5 m2/g.

公开(公告)号：US12300809B2

公开(公告)日：2025-05-13

申请号：US17660387

申请日：2022-04-22

Applicant: FDK CORPORATION

Inventor： Akira Saguchi ,  Shota Ohata ,  Jun Ishida ,  Yuki Ehara ,  Masaru Kihara

IPC: H01M4/36 ,  H01M4/62 ,  H01M10/30 ,  H01M4/02

Abstract: A nickel metal hydride secondary battery comprises an outer can and an electrode assembly housed in the outer can together with an alkaline electrolytic solution, wherein the electrode assembly is such that a positive electrode including a positive electrode mixture and a negative electrode including a negative electrode mixture are superimposed with a separator interposed therebetween, the positive electrode mixture includes nickel hydroxide forming a solid solution with zinc as a positive electrode active material and zinc oxide as a positive electrode additive, the negative electrode mixture includes hydrogen absorbing alloy particles and a negative electrode additive, the negative electrode additive is a composite in which yttrium fluoride is supported on carbon black, and a surface of the hydrogen absorbing alloy particles is partially coated with the composite.

公开(公告)号：US20220384786A1

公开(公告)日：2022-12-01

申请号：US17660387

申请日：2022-04-22

Applicant: FDK CORPORATION

Inventor： Akira Saguchi ,  Shota Ohata ,  Jun Ishida ,  Yuki Ehara ,  Masaru Kihara

IPC: H01M4/36 ,  H01M4/62 ,  H01M10/30

Abstract: A nickel metal hydride secondary battery comprises an outer can and an electrode assembly housed in the outer can together with an alkaline electrolytic solution, wherein the electrode assembly is such that a positive electrode including a positive electrode mixture and a negative electrode including a negative electrode mixture are superimposed with a separator interposed therebetween, the positive electrode mixture includes nickel hydroxide forming a solid solution with zinc as a positive electrode active material and zinc oxide as a positive electrode additive, the negative electrode mixture includes hydrogen absorbing alloy particles and a negative electrode additive, the negative electrode additive is a composite in which yttrium fluoride is supported on carbon black, and a surface of the hydrogen absorbing alloy particles is partially coated with the composite.

公开(公告)号：US20190319260A1

公开(公告)日：2019-10-17

申请号：US16383048

申请日：2019-04-12

Applicant: FDK CORPORATION

Inventor： Toshiki Sato ,  Jun Ishida ,  Akira Saguchi ,  Shota Ohata

IPC: H01M4/24 ,  H01M10/28 ,  H01M4/36 ,  H01M4/62 ,  H01M4/38

Abstract: A battery comprises an electrode group including a separator, a positive electrode and a negative electrode. The negative electrode comprises a negative electrode core, negative electrode mixture layers retained to the negative electrode core, and a fluorine resin layer disposed on the surface of the negative electrode mixture layers. The negative electrode mixture layers include a first outermost peripheral region located at the outermost periphery of the electrode group and a second outermost peripheral region located opposite to the first outermost peripheral region. When the amount of the fluorine resin constituting a first fluorine resin layer in a portion of the first outermost peripheral region is represented by A, and the amount of the fluorine resin constituting a second fluorine resin layer in a portion of the second outermost peripheral region is represented by B, a relation A>B is satisfied.

公开(公告)号：US20190148723A1

公开(公告)日：2019-05-16

申请号：US16180646

申请日：2018-11-05

Applicant: FDK CORPORATION

Inventor： Akira Saguchi ,  Jun Ishida ,  Shota Ohata

IPC: H01M4/38 ,  H01M4/24 ,  H01M4/62 ,  H01M10/30

Abstract: A nickel hydrogen secondary battery 2 has an electrode group 22 including a separator 28, a positive electrode 24, and a negative electrode 26. The negative electrode 26 has a negative electrode core, and a negative electrode mixture held on the negative electrode core. The negative electrode mixture contains a hydrogen absorbing alloy and a water repellent. The hydrogen absorbing alloy has a composition represented by the general formula: Ln1-xMgxNiy-a-bAlaMb, where Ln represents at least one element selected from rare earth elements, Ti and Zr; M represents at least one element selected from V, Nb, Ta, and the like, and the subscripts a, b, x and y satisfy relations represented by 0.05≤a≤0.30, 0≤b≤0.50, 0≤x

公开(公告)号：US20220294025A1

公开(公告)日：2022-09-15

申请号：US17653282

申请日：2022-03-02

Applicant: FDK CORPORATION

Inventor： Akira Saguchi

IPC: H01M10/28 ,  H01M4/24

Abstract: An electrode has a band-shaped core and an electrode mixture layer carried by the core to form a spiral electrode assembly with a gas generating electrode and a separator for an alkaline secondary battery. The electrode in the spiral shape has a first circumference portion, an intermediate portion, and an outermost circumference portion. The first circumference portion is a starting portion for winding into the spiral shape. The intermediate portion is a second and following circumferences of the spiral shape. The outermost circumference portion has an inner surface only which faces the gas generating electrode. The electrode mixture layer includes a reactant that develops a reaction consuming gas generated from the gas generating electrode. An amount of the reactant in the first circumference portion is more than those in the intermediate portion and/or the outermost circumference portion.

公开(公告)号：US11355753B2

公开(公告)日：2022-06-07

申请号：US16832811

申请日：2020-03-27

Applicant: FDK CORPORATION

Inventor： Jun Ishida ,  Akira Saguchi ,  Shota Ohata

IPC: H01M4/52 ,  C22C1/04 ,  C22C19/00 ,  H01M4/24 ,  H01M4/32 ,  H01M4/36 ,  H01M4/38 ,  H01M4/62 ,  H01M10/30 ,  H01M10/34 ,  H01M4/02

Abstract: A negative electrode used in a nickel metal hydride secondary battery includes a negative electrode core body and a negative electrode mixture carried on the negative electrode core body. The negative electrode mixture includes hydrogen storage alloy powder which is an aggregate of hydrogen storage alloy particles, a binder, and a thickener. The hydrogen storage alloy particles have a volume mean particle size of 40 μm or less and a concentration of chlorine of not less than 180 ppm to not more than 780 ppm.

公开(公告)号：US11038161B2

公开(公告)日：2021-06-15

申请号：US16357050

申请日：2019-03-18

Applicant: FDK CORPORATION

Inventor： Shota Ohata ,  Jun Ishida ,  Toshiki Sato ,  Akira Saguchi

IPC: H01M4/38 ,  H01M10/34 ,  H01M4/24 ,  H01M4/62 ,  H01M4/36 ,  H01M4/60 ,  H01M4/02

Abstract: A nickel-hydrogen secondary battery includes an electrode group which contains a positive electrode, a negative electrode, and a separator, wherein the negative electrode includes a negative electrode core, and a negative electrode mixture layer held by the negative electrode core, wherein the negative electrode mixture layer contains a fluororesin; a quantity of the fluororesin, expressed by a mass applied per unit area of the negative electrode, is within a range of 0.2 mg/cm2 or more and 2.0 mg/cm2 or less; and a fluororesin content which is a ratio of the fluororesin contained in a unit volume of the negative electrode mixture layer is higher in an inner layer portion than in an outer layer portion in the negative electrode mixture layer.