US 12,148,889 B2
Non-aqueous electrolyteincluding lithium bis(fluorosulfonyl)imide, fluorinated acyclic carboxylic acid ester, organic carbonate and electrolyte salt
Daniel Hancock, Media, PA (US); Du-Hyun Won, Cheongju-si (KR); Hyuncheol Lee, Gyeonggi-do (KR); Hyung Kwon Hwang, Seoul (KR); and Eun-Ji Moon, Seoul (KR)
Assigned to SYENSQO SA, Brussels (BE)
Appl. No. 16/960,594
Filed by SYENSQO SA, Brussels (BE); and Margaret A. Hancock
PCT Filed Jan. 11, 2019, PCT No. PCT/EP2019/050660
§ 371(c)(1), (2) Date Jul. 8, 2020,
PCT Pub. No. WO2019/138056, PCT Pub. Date Jul. 18, 2019.
Claims priority of provisional application 62/616,510, filed on Jan. 12, 2018.
Claims priority of application No. 18158776 (EP), filed on Feb. 27, 2018.
Prior Publication US 2020/0335825 A1, Oct. 22, 2020
Int. Cl. H01M 10/0569 (2010.01); H01M 10/0525 (2010.01); H01M 10/0567 (2010.01); H01M 10/0568 (2010.01)
CPC H01M 10/0569 (2013.01) [H01M 10/0525 (2013.01); H01M 10/0567 (2013.01); H01M 10/0568 (2013.01); H01M 2300/0034 (2013.01)] 14 Claims
OG exemplary drawing
 
1. An electrolyte composition comprising:
from 50 to about 80% by weight of a fluorinated solvent,
lithium bis (fluorosulfonyl) imide (LiFSI), in an amount of from 0.3% to about 5.0% by weight, based on the total weight of the electrolyte composition;
at least one linear or cyclic organic carbonate, that is fluorinated or non-fluorinated in an amount of from about 20% to about 40% by weight of the electrolyte composition; and
a main electrolyte different from LiFSI and in a greater amount than LiFSI, at a concentration ranging from 0.5 to 1.2M, and selected from the group consisting of lithium hexafluorophosphate (LiPF6), lithium bis (trifluoromethanesulfonyl) imide, lithium bis (perfluoroethanesulfonyl) imide, lithium (fluorosulfonyl) (nonafluorobutanesulfonyl) imide, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium trifluoromethanesulfonate, lithium tris (trifluoromethanesulfonyl) methide, Li2B12F12-xHx where x is equal to 0 to 8, mixtures of lithium fluoride and anion receptor B (OC6F5)3 and mixtures thereof,
wherein the fluorinated solvent is an acyclic carboxylic acid esters represented by the formula:
R1—COO—R2
wherein
i) R1 is an alkyl group;
ii) R2 is a fluoroalkyl group; and
iii) R1 and R2, taken as a pair, comprise at least two carbon atoms but not more than seven carbon atoms.