The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 29, 2022
Filed:
Jul. 10, 2018
Samsung Sdi Co., Ltd., Yongin-si, KR;
Sangeun Park, Yongin-si, KR;
Jiyeon Kwak, Yongin-si, KR;
Yeongap Kim, Yongin-si, KR;
Youngugk Kim, Yongin-si, KR;
Uisong Do, Yongin-si, KR;
Yuntaek Oh, Yongin-si, KR;
Yongchan You, Yongin-si, KR;
Changui Jeong, Yongin-si, KR;
Inoh Cha, Yongin-si, KR;
Hee Seon Choi, Yongin-si, KR;
SAMSUNG SDI CO., LTD., Yongin-si, KR;
Abstract
The present invention relates to a negative active material for a lithium secondary battery, a preparation method therefor, and a lithium secondary battery including the same. The negative electrode active material is a negative electrode material for a secondary battery, the negative electrode active material comprising a silicon-carbon composite comprising: a core comprising crystalline carbon and silicon particles; and an amorphous carbon-containing coating layer disposed on a surface of the core, wherein the negative electrode active material comprises: silicon oxide formed on a surface of the silicon particles; and an oxide of crystalline carbon, formed on a surface of the crystalline carbon, the average particle diameter (D50) of the silicon particles having a nanometer size, the proportion of O relative to Si in the silicon oxide is 30%-50%, and the proportion of O relative to C in the oxide of the crystalline carbon is 4%-10%.