Functionalized silanes and electrolyte compositions and electrochemical devices containing them
Described are compounds of the structure R 4-a —Si-(Sp-Y) a —Z b , wherein “a” is an integer from 1 to 4; “b” is an integer from 0 to (3×a); “Z,” which is absent when “b”=0, is “R” or wherein each “R” is halogen, C 1-6 linear or branched alkyl, alkenyl, or alkynyl or C 1-6 linear or branched halo-alkyl, halo-alkenyl, or halo-alkynyl; each “Sp” C 1-15 linear or branched alkylenyl or C 1-15 linear or branched halo-alkylenyl; and each “Y” an organic polar group. Also described are electrolyte compositions containing one or more of these compounds.
1. A compound selected from the group consisting of:
(R) 4-a —Si-((Sp-Y)—Z b ) a (Formula I)
wherein:
“a” is 1; “b” is 0 to 3;
“Z,” which is absent when “b”=0, is selected from the group consisting of halogen, C 1-6 linear or branched alkyl, alkenyl, and alkynyl, and
where each “R” is independently selected from the group consisting of halogen, C 1-6 linear or branched alkyl, alkenyl, and alkynyl, provided that at least one R is fluorine;
each “Sp” in Formulas I and II is independently selected from the group consisting of C 2 alkylenyl; and
each “Y” in Formula I is
2. The compound of claim 1 , wherein “b” is 1 and “Z” is selected from the group consisting of halogen, C 1-6 linear or branched alkyl, alkenyl, and alkynyl.
3. An electrolyte composition comprising a compound as recited in Claim 1 , in combination with a salt.
4. The electrolyte composition of claim 3 , wherein the salt is a lithium-containing salt.
5. An electrochemical device comprising an electrolyte composition as recited in claim 3 .