	US 12,237,470 B2
	Phosphate-based flame-retardant electrolyte and lithium-metal battery
Jun Chen, Tianjin (CN); Chunyu Zheng, Tianjin (CN); Yuankun Wang, Tianjin (CN); Yunpeng Hou, Tianjin (CN); Zhenhua Yan, Tianjin (CN); Haixia Li, Tianjin (CN); and Qing Zhao, Tianjin (CN)
Assigned to Nankai University, Tianjin (CN)
Filed by Nankai University, Tianjin (CN)
Filed on Jul. 20, 2023, as Appl. No. 18/355,460.
Claims priority of application No. 202310272422.3 (CN), filed on Mar. 21, 2023.
Prior Publication US 2024/0322248 A1, Sep. 26, 2024
Int. Cl. H01M 10/0568 (2010.01); H01M 4/38 (2006.01); H01M 10/0525 (2010.01); H01M 10/0567 (2010.01); H01M 10/0569 (2010.01); H01M 4/02 (2006.01)

CPC H01M 10/0568 (2013.01) [H01M 4/382 (2013.01); H01M 10/0525 (2013.01); H01M 10/0567 (2013.01); H01M 10/0569 (2013.01); H01M 2004/027 (2013.01); H01M 2300/0028 (2013.01)]

6 Claims

1. A phosphate-based flame-retardant electrolyte, consisting of a lithium salt, a phosphate solvent and a diluent, wherein,

the lithium salt is a fluorine-containing lithium salt;

the phosphate solvent is dimethyl (2-methoxyethoxy)methylphosphonate or diethyl (2-methoxyethoxy)methylphosphonate, and the phosphate solvent accounts for 10% to 90% of an overall electrolyte volume; and a volume ratio of the phosphate solvent to the diluent is 1 to 6:4 to 9; and

a local salt concentration is 1 mol/L to 6.6 mol/L, and an overall salt concentration is 0.7 mol/L to 3 mol/L;

wherein the lithium salt is one or more than two of lithium tetrafluoroborate, lithium bis(fluorosulfonyl)imide and lithium bis(trifluoromethanesulphonyl)imide; and

wherein the diluent is one or more than two of 1H,1H,5H-octafluoropentyl-1,1,2,2-tetrafluoroethyl ether, bis(2,2,2-trifluoroethyl) ether, methyl nonafluorobutyl ether and 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether.