Patent ID: 8435679

Claim:
A lithium ion battery comprising: a liquid electrolyte; a positive electrode; and a negative electrode, wherein said liquid electrolyte comprises a solvent and a lithium salt wherein the solvent comprises a compound according to the formula R—O—C(═O)—O—R′, wherein R is C x H 2x+1 and x is an integer from 1 to 4, and wherein R′ is —C(R h 7 )(R h 8 )CFR f 1 (CF 2 CF 2 ) n CHFR f 7 , wherein R f 1 is fluorine or C p F 2p+1 and p is an integer from 1 to 4, R f 7 is F, C p F 2p+1 , or R f 3 O(R f 4 O) m —, wherein R f 3 is C y F 2y+1 , and y is an integer from 1 to 8, and R f 4 is C q F 2q , wherein q is an integer from 1 to 4, and R h 7 and R h 8 are independently H or an alkyl group and wherein R h 7 and R h 8 are not both alkyl groups, the alkyl groups having 1 to 4 carbon atoms, m is 0 or 1, and n is 0 or 1, and such that when R h 7 and R h 8 are both hydrogen and n is 0, then R f 7 is not fluorine.