公开(公告)号：US20220399538A1

公开(公告)日：2022-12-15

申请号：US17775477

申请日：2020-11-10

Applicant: SHOWA DENKO K.K.

Inventor： Akihisa TONEGAWA ,  Hirofumi INOUE ,  Daisuke KOHNO ,  Jinseok BAEK

IPC: H01M4/36 ,  H01M10/0525 ,  H01M4/38 ,  H01M4/485 ,  H01M4/583

Abstract: An object of the present invention is to provide a composite material usable as a negative electrode material of a lithium-ion secondary battery.
A composite material of the present invention includes: a carbonaceous material; and a metal oxide layer coating a surface of the carbonaceous material, in which the metal oxide layer coats the surface of the carbonaceous material, forming a sea-island structure in which the metal oxide layer is scattered in islands, and a coating rate of the carbonaceous material with the metal oxide layer is 20% or more and 80% or less.
A composite material of the present invention includes: a carbonaceous material; and a metal oxide layer and amorphous carbon layer coating the surface of the carbonaceous material, in which the metal oxide layer is scattered in islands on the surface of the carbonaceous material.
A composite material of the present invention includes: a carbonaceous material; and a metal oxide layer coating the surface of the carbonaceous material, in which the metal oxide layer has at least a portion having a thickness of more than 10 nm, and in a coated area with the metal oxide, an area percentage of a portion having a thickness of 10 nm or less is 70% or more and 99% or less, and an area percentage of the portion having a thickness of more than 10 nm is 1% or more and 30% or less. A composite material of the present invention also includes: a carbonaceous material; and a metal oxide layer and amorphous carbon layer coating the surface of the carbonaceous material, in which the metal oxide layer has at least a portion having a thickness of more than 10 nm, and in a coated area with the metal oxide layer, an area percentage of a portion having a thickness of 10 nm or less is 30% or more and 70% or less, and an area percentage of the portion having a thickness of more than 10 nm is 30% or more and 70% or less.

公开(公告)号：US20180029891A1

公开(公告)日：2018-02-01

申请号：US15552830

申请日：2016-02-16

Applicant: SHOWA DENKO K.K.

Inventor： Akihisa TONEGAWA ,  Daisuke KOHNO ,  Daisuke HARADA ,  Yasuaki WAKIZAKA

IPC: C01B32/205 ,  H01M10/0525 ,  H01M4/133 ,  H01M4/66 ,  H01M4/62 ,  H01M4/525 ,  H01M4/505 ,  H01M10/0569 ,  H01M4/583

Abstract: The present provides a carbon material containing 50 to 1,000 ppm by mass of vanadium (V), wherein a mean particle diameter D50 is 3 to 7 μm; a tapping density after 400 times of tapping is 0.40 to 1.00 g/cm3; a BET specific surface area is 4.0 to 12.0 m2/g; an R value (ID/IG) measured in the spectrum observed by Raman spectroscopy is 0.10 to 0.30; and an interplanar spacing d002 of plane (002) (nm) and Lc002 (nm) as being the size in the c-axis direction of the graphite crystals satisfy the relationship represented by the following formulae (1) and (2) 0.3362≦d002≦0.3370   (1) −23660×d002+8010≦Lc002≦−23660×d002+8025   (2); which is suitable for a non-aqueous electrolytic secondary battery having a low resistance and a high coulomb efficiency; a method for producing the same; a carbon material for a battery electrode; an electrode; and a lithium-ion secondary battery using the above-described carbon material.