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：US20200148598A1

公开(公告)日：2020-05-14

申请号：US16631046

申请日：2018-07-19

Applicant: SHOWA DENKO K.K.

Inventor： Daisuke MIYAMOTO ,  Kosuke SHIOI

IPC: C04B35/581 ,  C04B35/626 ,  C04B35/63 ,  C04B35/634 ,  C04B35/638 ,  C04B35/64 ,  H01L23/15 ,  H01L21/48 ,  H01L23/373

Abstract: An aluminum nitride sintered compact containing aluminum nitride crystal grains and composite oxide crystal grains containing a rare earth element and an aluminum element, wherein a median diameter of the aluminum nitride crystal grains is 2 μm or less; 10 to 200 intergrain voids having a longest diameter of 0.2 to 1 μm are dispersed in a region of a cross section of 100 μm in square; and the carbon atom content is less than 0.10% by mass. Also disclosed is a method of producing the aluminum nitride sintered compact.

公开(公告)号：US20180069260A1

公开(公告)日：2018-03-08

申请号：US15573176

申请日：2016-05-10

Applicant: SHOWA DENKO K.K.

Inventor： Yasuaki WAKIZAKA ,  Yoshikuni SATO ,  Daisuke MIYAMOTO

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

CPC classification number: H01M10/0525 ,  C01B32/20 ,  H01M4/587

Abstract: A method for producing a graphite powder for a negative electrode of a lithium ion secondary battery, including a process of graphitizing a mixture of a carbon raw material powder and a silicon carbide powder, wherein a 90% particle diameter in a volume-based cumulative particle size distribution by laser diffraction method, D90, is 1 to 40 μm, a silicon carbide content in a total mass of a carbon raw material and silicon carbide (mass of silicon carbide/total mass of the carbon raw material and silicon carbide) is 1 to 35 mass %, the ratio of a 50% particle diameter in a volume-based cumulative particle size distribution by laser diffraction method, D50, of the carbon raw material powder to D50 of silicon carbide powder (D50 of the carbon raw material powder/D50 of silicon carbide powder) is 0.40 to 4.0.