US 11,990,585 B2
Electrolyte formulations for optimal performance in Si-containing lithium ion batteries
Benjamin Yong Park, Irvine, CA (US); Heidi Anderson, Irvine, CA (US); Hong Zhao, Irvine, CA (US); Vincent Giordani, Irvine, CA (US); Sung Ju Cho, Irvine, CA (US); Myunghwan Jeong, Irvine, CA (US); Daniel Sylvinson Muthiah Ravinson, Irvine, CA (US); Samuel Keene, Irvine, CA (US); and Mya Le Thai, Irvine, CA (US)
Assigned to Enevate Corporation, Irvine, CA (US)
Filed by Enevate Corporation, Irvine, CA (US)
Filed on Aug. 18, 2022, as Appl. No. 17/890,543.
Prior Publication US 2024/0079653 A1, Mar. 7, 2024
Int. Cl. H01M 10/0569 (2010.01); H01M 4/38 (2006.01); H01M 10/0525 (2010.01); H01M 10/0567 (2010.01); H01M 4/02 (2006.01)
CPC H01M 10/0569 (2013.01) [H01M 10/0525 (2013.01); H01M 10/0567 (2013.01); H01M 2004/027 (2013.01); H01M 4/386 (2013.01)] 20 Claims
 
1. An energy storage device comprising:
a first electrode and a second electrode, wherein one or both of the first electrode and the second electrode is a Si-based electrode;
a separator between the first electrode and the second electrode; and
an electrolyte composition;
wherein said electrolyte composition comprises two or more lithium salts,
10-50 wt % of one or more fluorinated solvents,
50-90 wt % of one or more non-fluorinated solvents, and
one or more additives comprising a total of between 0.25-1.5 wt % of the total electrolyte composition; and
wherein said one or more additives are selected from the group consisting of PES (prop-1-ene-1,3-sultone), TMSP (tris(trimethylsilyl)phosphite), TMS (trimethylene sulfate), TMSO (3-trimethylsilyl-2-oxazolidinone), and PMS (propargyl methanesulfonate);
said Si-based electrode is a silicon dominant electrode where the amount of silicon in the active material comprises 70% or more by weight; and
said one or more fluorinated solvents comprises fluorobenzene (FB).