公开(公告)号：US20230187614A1

公开(公告)日：2023-06-15

申请号：US17907017

申请日：2021-10-18

申请人： GRAPSIL CO., LTD.

发明人： Huijin KIM ,  Hyunki PARK ,  Yohan HONG ,  Jungsu PARK ,  Jonggeun LEE

IPC分类号： H01M4/36 ,  H01M4/38 ,  H01M4/583 ,  H01M4/04 ,  H01M10/052

CPC分类号： H01M4/366 ,  H01M4/386 ,  H01M4/583 ,  H01M4/0471 ,  H01M10/052 ,  H01M2004/027

摘要： The present invention relates to an anode active material comprising a silicon composite, a preparation method therefor, and a lithium secondary battery comprising same to have excellent lifespan characteristics, output characteristics and safety, the silicon composite comprising: a core formed by coating a first crystalline carbon on the surface of needle-shaped silicon nanoparticles and plate-shaped silicon nanoparticles that differ in aspect ratio; and a shell that surrounds the core and comprises amorphous carbon, in which a second crystalline carbon is positioned on the entire surface of the shell or a part thereof.

公开(公告)号：US20240120464A1

公开(公告)日：2024-04-11

申请号：US18263857

申请日：2022-04-25

申请人： GRAPSIL CO., LTD.

发明人： Huijin KIM ,  Hyunki PARK ,  Jungsu PARK

IPC分类号： H01M4/36 ,  C01B32/21 ,  C01B33/02 ,  H01M4/38 ,  H01M4/583 ,  H01M4/62 ,  H01M10/052

CPC分类号： H01M4/364 ,  C01B32/21 ,  C01B33/02 ,  H01M4/386 ,  H01M4/583 ,  H01M4/625 ,  H01M10/052 ,  H01M2004/027

摘要： Disclosed are a method of preparing a carbon-silicon composite powder including A) adding crystalline carbon and a precursor of amorphous carbon to a silicon slurry containing silicon particles and a dispersion medium to prepare a first mixed solution containing silicon particles, crystalline carbon and the precursor of amorphous carbon in a weight ratio of 20 to 70:20 to 70:1 to 19, B) spray drying the first mixed solution to prepare a first composite powder, C) adding the first composite powder to an aqueous solvent containing carbon fibers to prepare a second mixed solution, D) subjecting the second mixed solution to cold isostatic pressing, followed by drying to prepare a second composite powder, and E) screening the second composite powder without pulverization to prepare a carbon-silicon composite powder, a carbon-silicon composite powder produced using the same, and a lithium secondary battery including the same.

公开(公告)号：US20240105919A1

公开(公告)日：2024-03-28

申请号：US18263843

申请日：2022-07-26

申请人： GRAPSIL CO., LTD.

发明人： Huijin KIM ,  Hyunki PARK

IPC分类号： H01M4/36 ,  H01M4/04 ,  H01M4/38 ,  H01M4/583 ,  H01M10/052

CPC分类号： H01M4/366 ,  H01M4/0419 ,  H01M4/386 ,  H01M4/583 ,  H01M10/052 ,  H01M2004/027

摘要： Disclosed are an anode active material having a multilayered structure including a core including a carbon material, a first shell surrounding the core and including silicon particles, and a second shell surrounding the first shell and including a first crystalline carbon layer, a first amorphous carbon layer, a second crystalline carbon layer, and a second amorphous carbon layer, a method of preparing the same, and a lithium secondary battery including the same.