Nitrile-substituted silanes and electrolyte compositions and electrochemical devices containing them
View Patent ↗Described herein are liquid, organosilicon compounds that including a substituent that is a cyano (—CN), cyanate (—OCN), isocyanate (—NCO), thiocyanate (—SCN) or isothiocyanate (—NCS). The organosilicon compounds are useful in electrolyte compositions and can be used in any electrochemical device where electrolytes are conventionally used.
1. An electrolyte composition comprising a compound of Formula III,
wherein R 1 , R 2 , and R 3 are the same or different and are independently selected from the group consisting of C 1 to C 6 linear or branched alkyl and fluorine, and wherein at least one of R 1 , R 2 , or R 3 is fluorine;
“Spacer” is selected from the group consisting of C 3 to C 6 linear or branched alkylene, alkenylene, or alkynylene; and
R 4 is selected from the group consisting of cyano (—CN), cyanate (—OCN), isocyanate (—NCO), thiocyanate (—SCN) and isothiocyanate (—NCS);
in combination with a lithium-containing salt.
2. The electrolyte composition of claim 1 , wherein R 4 is cyano.
3. The electrolyte composition of claim 1 , wherein R 1 , R 2 , and R 3 are selected from the group consisting of C 1 to C 3 alkyl, and fluoro.
4. The electrolyte composition of claim 1 , wherein at least two of R 1 , R 2 , and R 3 are fluorine.
5. The electrolyte composition of claim 1 , wherein “Spacer” is a C3 to C 4 linear or branched alkylene.
6. An electrochemical device comprising an electrolyte composition as recited in claim 1 .
7. The electrochemical device of claim 6 , wherein R 4 is cyano.
8. The electrochemical device of claim 6 , wherein R 1 , R 2 , and R 3 are selected from the group consisting of C 1 to C 3 alkyl, and fluoro.
9. The electrochemical device of claim 6 , wherein at least two of R 1 , R 2 , and R 3 are fluorine.
10. The electrochemical device of claim 6 , wherein “Spacer” is a C3 to C 4 linear or branched alkylene.