公开(公告)号：US20240290974A1

公开(公告)日：2024-08-29

申请号：US18570495

申请日：2022-06-15

Applicant: ENEOS CORPORATION

Inventor： Takashi SUZUKI ,  Toshiyuki HIROKI ,  Zhen WANG ,  Keizo IKAI ,  Noriyuki KIUCHI ,  Takahiro SHIRAI

IPC: H01M4/587 ,  C01B32/205 ,  H01M4/02 ,  H01M10/0525

CPC classification number: H01M4/587 ,  C01B32/205 ,  H01M10/0525 ,  C01P2006/10 ,  C01P2006/12 ,  C01P2006/40 ,  H01M2004/027

Abstract: A method for producing an synthetic graphite material for lithium-ion secondary battery negative electrodes, including a step of performing a coking treatment on a raw material oil composition by carrying out a delayed coking process to generate a raw coke composition, a step of performing a heat treatment on the raw coke composition to obtain a heat-treated raw coke composition, a step of crushing the heat-treated raw coke composition to obtain heat-treated raw coke powder, a step of coating the heat-treated raw coke powder with a coating material to obtain coated heat-treated raw coke powder, and a step of graphitizing the coated heat-treated raw coke powder to obtain an synthetic graphite material for lithium-ion secondary battery negative electrodes, in which a specific surface area of the heat-treated raw coke powder is 10.5 m2/g or greater.

公开(公告)号：US20230216052A1

公开(公告)日：2023-07-06

申请号：US17927808

申请日：2021-06-18

Applicant: ENEOS CORPORATION

Inventor： Takashi SUZUKI ,  Toshiyuki HIROKI ,  Zhen WANG ,  Keizo IKAI ,  Noriyuki KIUCHI ,  Takahiro SHIRAI

IPC: H01M4/587 ,  H01M10/0525 ,  H01M4/133 ,  C01B32/205 ,  C01B32/21

CPC classification number: H01M4/587 ,  H01M10/0525 ,  H01M4/133 ,  C01B32/205 ,  C01B32/21 ,  H01M2004/027

Abstract: A method for producing an artificial graphite material for a lithium ion secondary battery negative electrode, including at least a step of performing a coking treatment on a raw material oil composition by performing a delayed coking process to generate a raw coke composition, a step of performing a heat treatment on the raw coke composition to obtain a heat-treated raw coke composition, a step of crushing the heat-treated raw coke composition to obtain heat-treated raw coke powder, a step of graphitizing the heat-treated raw coke powder to obtain graphite powder, and a step of crushing the graphite powder, in which a volatile content of the heat-treated raw coke powder is less than 3.71%, and a true density of the heat-treated raw coke powder is greater than 1.22 g/cm3 and less than 1.73 g/cm3.