Electrolyte having eutectic mixture and electrochemical device containing the same

摘要

An electrolyte includes a eutectic mixture comprising (a) an alkoxy alkyl group-containing amide compound having a specific chemistry formula 1 or 2:;wherein each of X, R, R1, R2, m and n is defined;and (b) an ionizable lithium salt. The eutectic mixture-containing electrolyte exhibits excellent high temperature stability as well as inherent characteristics of eutectic mixtures, including excellent thermal and chemical stability, thus contributing to improved high temperature stability and decreased lowest limit of electrochemical window. The electrolyte is useful in electrochemical devices comprising various anode materials.

主权项

1. An electrolyte, comprising a eutectic mixture comprising:
(a) an alkoxy alkyl group-containing amide compound expressed by the following Chemistry FIG. 1 or 2; and (b) an ionizable lithium salt, wherein the eutectic mixture contains the alkoxy alkyl group-containing compound and the lithium salt at a mole ratio of 1:1 to 8:1, wherein R1 is an alkoxy alkyl group expressed by CH3—(CH2)p-O(CH2)q, where p is an integer of 0 to 8 and q is an integer of 1 to 8, wherein R2 is hydrogen, halogen or any one selected from the group consisting of alkyl group, alkylamine group, alkenyl group and aryl group having 1 to 20 carbons, independently, among which at least one is an alkoxy alkyl group expressed by CH3—(CH2)p-O(CH2)q, where p is an integer of 0 to 8 and q is an integer of 1 to 8, wherein R is hydrogen, halogen or any one selected from the group consisting of alkyl group, alkylamine group, alkenyl group and aryl group having 1 to 20 carbons, and wherein X is any one selected from the group consisting of carbon, silicon, oxygen, phosphorus, sulfur and hydrogen, wherein i) m is 0 when X is hydrogen, ii) m is 1 when X is oxygen or sulfur, iii) m is 2 when X is phosphorus, and iv) m is 3 when X is carbon or silicon; wherein R is hydrogen, or any one selected from the group consisting of alkyl group, alkylamine group, alkenyl group, aryl group and allyl group having 1 to 20 carbons, wherein R1 is an alkoxy alkyl group expressed by CH3—(CH2)p-O(CH2)q, where p is an integer of 0 to 8 and q is an integer of 1 to 8, wherein X is any one selected from the group consisting of carbon, silicon, oxygen, phosphorus and sulfur, wherein i) m is 0 when X is oxygen or sulfur, ii) m is 1 when X is phosphorus, and iii) m is 2 when X is carbon or silicon, and where n is an integer of 1 to 10, and wherein the eutectic mixture has a viscosity of 200 cP or less.