Additive having cyano group for non-aqueous electrolyte and electrochemical device using the same
View Patent ↗Disclosed is an additive for a non-aqueous electrolyte, which is a compound having a double bond and at least two cyano groups, the two cyano groups being in a trans-formation to the double bond. Also, a non-aqueous electrolyte comprising the additive and an electrochemical device comprising the non-aqueous electrolyte are also disclosed. Further, an electrode comprising the cyano group-containing compound and an electrochemical device comprising the electrode are disclosed.
1. A non-aqueous electrolyte comprising:
an electrolyte salt;
an organic solvent; and
an additive for a non-aqueous electrolyte,
wherein the additive for a non-aqueous electrolyte is a compound represented by the following Formula 1 and having a double bond and at least two cyano groups, wherein the two of the at least two cyano groups are in a trans-formation to the double bond,
wherein the electrolyte salt is formed of a combination of (i) a cation selected from the group consisting of Li + , Na + and K + ; and (ii) an anion selected from the group consisting of PF 6 − , BF 4 − , Cl − , Br − , I − , ClO 4 − , AsF 6 − ; CH 3 CO 2 − , CF 3 SO 3 − , N(CF 3 SO 2 ) 2 − and C(CF 2 SO 2 ) 3 − ,
wherein the organic solvent is at least one solvent selected from the group consisting of cyclic carbonates, linear carbonates, lactones, ethers, esters, sulfoxides, acetonitriles, lactams, ketones and halogen derivatives thereof:
wherein the compound represented by the Formula 1 is 1,1,4,4-tetracyanobutene.
2. The non-aqueous electrolyte as claimed in claim 1 , wherein the additive is used in an amount of 0.01-10 wt % in the non-aqueous electrolyte.
3. The non-aqueous electrolyte as claimed in claim 1 , wherein the anion is BF 4 − .