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:
Dec. 30, 2025
Filed:
Oct. 21, 2021
Lg Energy Solution, Ltd., Seoul, KR;
Seong-Hee Noh, Daejeon, KR;
Su-Jin Park, Daejeon, KR;
LG ENERGY SOLUTION, LTD., Seoul, KR;
Abstract
A separator for a lithium secondary battery and a lithium secondary battery including the separator, including a porous polymer substrate; and a porous coating layer on at least one surface of the porous polymer substrate. The porous coating layer includes first inorganic particles surface-treated with a polyphenol-containing compound, second inorganic particles surface-treated with an organic acid, and a binder polymer. The first inorganic particles have an average particle diameter of 100 nm to 700 nm, and the second inorganic particles have an average particle diameter of 30 nm to 80 nm. The separator for a lithium secondary battery uses two types of surface-treated inorganic particles having a different average particle diameter. Therefore, the inorganic particles have improved dispersibility, and the separator has high thermal safety and can prevent separation of the inorganic particles.