公开(公告)号：US20190237763A1

公开(公告)日：2019-08-01

申请号：US16312398

申请日：2017-06-19

Applicant: SHOWA DENKO K.K.

Inventor： Yasuaki WAKIZAKA ,  Yoshikuni SATO ,  Daisuke MIYAMOTO ,  Shunsuke YOSHIOKA ,  Daisuke KONO ,  Ayaka IKADO

IPC: H01M4/587 ,  H01M10/0525 ,  C01B32/20

CPC classification number: H01M4/587 ,  C01B32/20 ,  C01B32/205 ,  C01P2002/60 ,  C01P2004/32 ,  C01P2004/51 ,  C01P2004/60 ,  C01P2006/11 ,  C01P2006/12 ,  C01P2006/40 ,  H01M4/133 ,  H01M4/364 ,  H01M10/0525 ,  H01M2004/021 ,  H01M2004/027

Abstract: A graphite material, including high crystallinity graphite and spherical graphite, in which high crystallinity graphite: (1) a rhombohedral crystal ratio by X-ray diffractometry is 0.02 or less, (2) Lc is 90 nm or more, (3) when a pressure of 1 GPa for 10 seconds is applied to the high crystallinity graphite, the increment rate of the BET specific surface area after applying the pressure to the BET specific surface area before applying the pressure is 90% or less, and (4) D10 is 5.0 μm or more; and in which spherical graphite: (1) a median of the circularity is 0.90 or more, and (2) a tapping density is 1.20 g/cm3 or more; and the ratio by mass of the high crystallinity graphite and the spherical graphite is 95:5 to 40:60; an electrode using the graphite material as an electrode active material; and a lithium ion secondary battery using the electrode.

公开(公告)号：US20200227746A1

公开(公告)日：2020-07-16

申请号：US16637430

申请日：2018-08-08

Applicant: SHOWA DENKO K.K.

Inventor： Xu WANG ,  Ayaka IKADO ,  Akihisa TONEGAWA ,  Yasuaki WAKIZAKA

IPC: H01M4/587 ,  H01M10/0525 ,  H01M4/36 ,  C01B32/21

Abstract: A negative electrode active material for a secondary battery including an artificial flake graphite A and an artificial lump graphite B and having a ratio D50(A)/D50(B) of 50% particle diameter D50(A) of the artificial flake graphite A in a volume-based particle size distribution to 50% particle diameter D50(B) of the artificial lump graphite B in a volume-based particle size distribution is more than 0.6 and less than 1.0. The artificial flake graphite A has a surface roughness R of not less than 2.8 and not more than 5.1, the artificial lump graphite B has a surface roughness R of not less than 6.0 and not more than 9.0, and a ratio B/(A+B) of a mass of the artificial lump graphite B to the total mass of the artificial flake graphite A and the artificial lump graphite B is not less than 0.03 and not more than 0.30.

公开(公告)号：US20180019472A1

公开(公告)日：2018-01-18

申请号：US15545850

申请日：2016-01-26

Applicant: SHOWA DENKO K.K.

Inventor： Ayaka IKADO ,  Yasuaki WAKIZAKA ,  Takashi TERASHIMA ,  Yoshikuni SATO

IPC: H01M4/587 ,  H01M4/583

CPC classification number: H01M4/587 ,  C01B32/20 ,  C01B32/205 ,  C01B32/21 ,  C01B2204/04 ,  H01M4/5835 ,  H01M10/0525

Abstract: A method for manufacturing a graphite powder for a negative electrode material for a lithium-ion secondary battery, which includes a process of pulverizing a graphite precursor, and subjecting a mixture of the pulverized graphite precursor and an alkaline compound to graphitization treatment by heating the mixture at 2,800 to 3,500° C. Also disclosed is a graphite powder obtained by the manufacturing method, a negative electrode for a lithium-ion secondary battery containing the graphite powder and a lithium-ion battery provided with the negative electrode.