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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.:

US 12444808 B1

PDFFull Text
Date of Patent:
Oct. 14, 2025

Filed:

Sep. 14, 2023

Separator for rechargeable lithium battery and rechargeable lithium battery including the same

Applicant:

Samsung Sdi Co., Ltd., Yongin-si, KR;

Inventors:

Hyeonsun Choi, Suwon-si, KR;

Yongkyoung Kim, Suwon-si, KR;

Jungyoon Lee, Suwon-si, KR;

Yangseob Kim, Suwon-si, KR;

Assignee:

SAMSUNG SDI CO., LTD., Yongin-si, KR;

Attorney:

Lee IP Law, P.C.

Primary Examiner:

Jeremiah R Smith

Int. Cl.
CPC ...
H01M 50/446 (2021.01); H01M 8/0202 (2016.01); H01M 10/0525 (2010.01); H01M 50/417 (2021.01); H01M 50/42 (2021.01); H01M 50/451 (2021.01); H01M 50/454 (2021.01); H01M 50/457 (2021.01); H01M 50/46 (2021.01); H01M 50/489 (2021.01); H01M 4/02 (2006.01); H01M 50/411 (2021.01); H01M 50/431 (2021.01); H01M 50/434 (2021.01); H01M 50/443 (2021.01);
U.S. Cl.
CPC ...
H01M 50/446 (2021.01); H01M 8/0202 (2013.01); H01M 10/0525 (2013.01); H01M 50/417 (2021.01); H01M 50/42 (2021.01); H01M 50/451 (2021.01); H01M 50/454 (2021.01); H01M 50/457 (2021.01); H01M 50/461 (2021.01); H01M 50/489 (2021.01); H01M 2004/027 (2013.01); H01M 2004/028 (2013.01); H01M 50/411 (2021.01); H01M 50/431 (2021.01); H01M 50/434 (2021.01); H01M 50/443 (2021.01);
Abstract

A separator for a rechargeable lithium battery and a rechargeable lithium battery including the separator, the separator including a porous substrate, and a coating layer on at least one surface of the porous substrate, wherein the coating layer includes a heat resistant binder including a (meth)acryl copolymer including a first structural unit and a second structural unit, the first structural unit being a structural unit of a (meth)acrylamide and the second structural unit being a structural unit of a (meth)acrylic acid, a (meth)acrylate, a (meth)acrylonitrile, a (meth)acrylamido sulfonic acid, a (meth)acrylamido sulfonate salt, or a combination thereof; polyethylene particles; and first inorganic particles, and an average particle size (D50) of the first inorganic particles is larger than an average particle size (D50) of the polyethylene particles.

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