US 12,334,561 B2
Lithium metal negative electrode and method of manufacturing the same
Kanako Okada, Royal Oak, MI (US); Jesse M. Roy, Madison Heights, MI (US); Li Yang, Troy, MI (US); and Mary E. Fortier, Troy, MI (US)
Assigned to GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US)
Filed by GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US)
Filed on Nov. 12, 2021, as Appl. No. 17/525,096.
Prior Publication US 2023/0155133 A1, May 18, 2023
Int. Cl. H01M 4/62 (2006.01); H01M 4/04 (2006.01); H01M 4/134 (2010.01); H01M 4/1395 (2010.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01); H01M 10/052 (2010.01)
CPC H01M 4/628 (2013.01) [H01M 4/0402 (2013.01); H01M 4/134 (2013.01); H01M 4/1395 (2013.01); H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 10/052 (2013.01); H01M 2300/0025 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A method of manufacturing a negative electrode for a secondary lithium metal battery, the method comprising:
applying a precursor solution to a major surface of a lithium metal substrate to form a protective interfacial layer thereon, the protective interfacial layer having a thickness in a range of 10 nanometers to 5 micrometers, a composite structure, and being chemically bonded to the lithium metal substrate via a plurality of silicon-oxygen bonds and alkoxide bonds, the composite structure including a polymeric matrix component and a lithium-containing dispersed component embedded in the polymeric matrix component, the polymeric matrix component comprising a plurality of siloxane bonds and the lithium-containing dispersed component comprising lithium fluoride,
wherein the precursor solution
applied to the major surface of the lithium metal substrate comprises an organic solvent, 10% to 50%, by weight, of a dioxolane, and 2% to 5%, by weight, of a fluorinated organosilane, the dioxolane being a chemical compound that contains a dioxolane ring, and the fluorinated organosilane having the formula: R′R″nSiX4-n, wherein n=0, 1, or 2, and wherein R′ is a polyfluorinated C1-C8 alkyl group having greater than or equal to 3 and less than or equal to 13 fluorine atoms, R″ is H or a methyl group, and X is a methoxy group or a chlorine atom.