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:
Jun. 09, 2020
Filed:
Dec. 19, 2017
GM Global Technology Operations Llc, Detroit, MI (US);
Xiaosong Huang, Novi, MI (US);
Hamid G. Kia, Bloomfield Hills, MI (US);
GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US);
Abstract
A thermally-stable composite separator for an electrochemical cell that cycles lithium ions is provided, along with methods of making the composite separator. The method includes contacting one or more surface regions of a coated substrate with a coagulant. The coated substrate includes an insulating porous substrate and at least one non-porous polymeric layer including a polymer, one or more nanoparticles, one or more sub-micron particles, and a solvent. Contacting the coated substrate with the coagulant medium removes the solvent causing the polymer to precipitate forming at least one substantially uniform porous polymer layer in place of the at least one non-porous polymeric layer. The coagulant medium has a viscosity greater than that of the solvent and a solubility parameter distance between the polymer and the coagulant medium is less than that between the polymer and water.