公开(公告)号：US20230420656A1

公开(公告)日：2023-12-28

申请号：US18035024

申请日：2021-11-02

Applicant: GS Yuasa International Ltd.

Inventor： Daisuke ENDO ,  Naoki INOUE

IPC: H01M4/36 ,  H01M4/58 ,  H01M4/62 ,  H01M4/136 ,  H01M10/0525 ,  H01G11/26 ,  H01G11/32

CPC classification number: H01M4/366 ,  H01M4/5825 ,  H01M4/625 ,  H01M2004/028 ,  H01M10/0525 ,  H01G11/26 ,  H01G11/32 ,  H01M4/136

Abstract: A positive electrode for nonaqueous electrolyte energy storage device according to an aspect of the present invention includes a positive composite layer containing a composite positive active material in which at least part of a surface of a positive active material is coated with carbon, a proportion of a pore specific surface area of the carbon to a pore specific surface area of the composite positive active material is 20% or more and 50% or less, a density of the positive composite layer is 1.80 g/cm3 or more and 2.10 g/cm3 or less, and the positive active material is a compound represented by the following Formula 1.


LiFexMn(1-x)PO4(0≤x≤1)  1

公开(公告)号：US20230130712A1

公开(公告)日：2023-04-27

申请号：US17909473

申请日：2021-03-03

Applicant: GS Yuasa International Ltd.

Inventor： Daisuke ENDO ,  Naoki INOUE ,  Takanori MAHARA

IPC: H01M4/58 ,  H01M4/62 ,  H01M10/0525

Abstract: The positive active material for an energy storage device according to one aspect of the present invention has an olivine-type crystal structure, has a surface at least partially coated with carbon, and satisfies either (A) or (B) below. (A) a pore volume in a range of a pore size of 60 nm or more and 200 nm or less determined by a BJH method from a desorption isotherm using a nitrogen gas adsorption method is 0.05 cm3/g or more and 0.25 cm3/g or less, and a pore specific surface area in a range of a pore size of 10 nm or more and 200 nm or less using a nitrogen gas adsorption method is 5 m2/g or more; (B) a full width at half maximum ratio (200)/(131) of a peak corresponding to a (200) plane to a peak corresponding to a (131) plane by a powder X-ray diffraction method using a CuKα ray in a charged state is 1.10 or less.

公开(公告)号：US20230102905A1

公开(公告)日：2023-03-30

申请号：US17774537

申请日：2020-06-16

Applicant: GS Yuasa International Ltd.

Inventor： Naoki INOUE ,  Fumiya KONDO ,  Takashi KANEKO ,  Takashi SHIMIZU ,  Akihito TANOI ,  Heisuke NISHIKAWA

IPC: H01M50/489 ,  H01M4/38 ,  H01M50/417 ,  H01M10/0525

Abstract: An aspect of the present invention is a nonaqueous electrolyte energy storage device including: a negative electrode including a negative active material layer with a thickness expansion rate of 10% or more due to charge; and a separator, in which the absolute value (|dR/dP|) of an increase in resistance (dR) to a change in pressure (dP) in pressurization is 0.15 Ω·cm2/MPa or less in the separator impregnated with a measurement electrolyte solution, the measurement electrolyte solution contains an ethylene carbonate and an ethyl methyl carbonate as a solvent, and a lithium hexafluorophosphate as an electrolyte salt, the volume ratio between the ethylene carbonate and the ethyl methyl carbonate is 30:70, and the concentration of the lithium hexafluorophosphate is 1.0 mol/L.

公开(公告)号：US20200249278A1

公开(公告)日：2020-08-06

申请号：US16758433

申请日：2018-10-22

Applicant: GS Yuasa International Ltd.

Inventor： Naoki INOUE

IPC: G01R31/3835 ,  H01M4/48 ,  H01M10/0525 ,  H01M10/48 ,  H02J7/00

Abstract: An estimation apparatus estimates an internal state of an energy storage device having a positive electrode, a negative electrode including a negative active material that contains SiOx, and a nonaqueous electrolyte, the energy storage device changing from a positive-electrode limiting type, in which a discharge capacity is limited by the positive electrode, to a negative-electrode limiting type, in which the discharge capacity is limited by the negative electrode. The estimation apparatus estimates the internal state of the energy storage device by using a voltage value and an energization amount in a predetermined voltage range of the energy storage device or at a predetermined measured voltage value, or based on information on the shape of a discharge curve of the energy storage device.