公开(公告)号：US20170187032A1

公开(公告)日：2017-06-29

申请号：US15149520

申请日：2016-05-09

Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY

Inventor： Won Young CHANG ,  Byung Won CHO ,  Kyung Yoon CHUNG ,  Si Hyoung OH ,  Young Sun SHIN ,  Sooyeon HWANG ,  Yoon Bong OH

IPC: H01M4/134 ,  H01M4/62 ,  H01M4/1395 ,  H01M10/0568 ,  H01M10/0525 ,  H01M10/0585 ,  H01M2/16 ,  H01M10/0569 ,  H01M4/38 ,  H01M4/04

CPC classification number: H01M4/134 ,  H01M4/0471 ,  H01M4/1395 ,  H01M4/366 ,  H01M4/386 ,  H01M4/62 ,  H01M4/625 ,  H01M10/052

Abstract: Disclosed is a silicon-based anode active material for a lithium secondary battery. The silicon-based anode active material imparts high capacity and high power to the lithium secondary battery, can be used for a long time, and has good thermal stability. Also disclosed is a method for preparing the silicon-based anode active material. The method includes (A) binding metal oxide particles to the entire surface of silicon particles or portions thereof to form a silicon-metal oxide composite, (B) coating the surface of the silicon-metal oxide composite with a polymeric material to form a silicon-metal oxide-polymeric material composite, and (C) heat treating the silicon-metal oxide-polymeric material composite under an inert gas atmosphere to convert the coated polymeric material layer into a carbon coating layer.