Electrolyte and electrochemical device comprising the same

An electrochemical device, comprising an electrode and an electrolyte, wherein the electrolyte comprising:

• a fluorinated cyclic carbonate, a chain carboxylate, a dinitrile compound and a multi-nitrile compound having an ether bond, wherein based on a total weight of the electrolyte, a weight percentage (Cf) of the fluorinated cyclic carbonate is greater than a weight percentage (Cn) of the multi-nitrile compound having an ether bond;
• wherein,
• the dinitrile compound comprises at least one selected from the group consisting of succinonitrile, adiponitrile, and ethylene glycol bis(2-cyanoethyl) ether;
• and,
• the multi-nitrile compound having an ether bond is selected from at least one of the group consisting of 1,2,3-tris(2-cyanoethoxy)propane, 1,2,4-tris(2-cyanoethoxy)butane, 1,1,1-tris(cyanoethoxymethylene)ethane, 1,1,1-tris(cyanoethoxymethylene)propane, 3-methyl-1,3,5-tris(cyanoethoxy)pentane, 1,2,7-tris(cyanoethoxy)heptane, 1,2,6-tris(cyanoethoxy)hexane, and 1,2,5-tris(cyanoethoxy)pentane;
• wherein the electrolyte further comprises at least one of a cyclic carbonate having a carbon-carbon double bond within the range of 0.01 wt % to 0.5 wt %, a fluorinated chain carbonate, and a compound having a sulfur-oxygen double bond.

An electronic device, comprising an electrochemical device, the electrochemical device comprising an electrode and an electrolyte, wherein the electrolyte comprising:

• a fluorinated cyclic carbonate, a chain carboxylate, a dinitrile compound and a multi-nitrile compound having an ether bond, wherein based on a total weight of the electrolyte, a weight percentage (Cf) of the fluorinated cyclic carbonate is greater than a weight percentage (Cn) of the multi-nitrile compound having an ether bond;
• wherein,
• the dinitrile compound comprises at least one selected from the group consisting of succinonitrile, adiponitrile, and ethylene glycol bis(2-cyanoethyl) ether;
• and,
• the multi-nitrile compound having an ether bond is selected from at least one of the group consisting of 1,2,3-tris(2-cyanoethoxy)propane, 1,2,4-tris(2-cyanoethoxy)butane, 1,1,1-tris(cyanoethoxymethylene)ethane, 1,1,1-tris(cyanoethoxymethylene)propane, 3-methyl-1,3,5-tris(cyanoethoxy)pentane, 1,2,7-tris(cyanoethoxy)heptane, 1,2,6-tris(cyanoethoxy)hexane, and 1,2,5-tris(cyanoethoxy)pentane;
• wherein the electrolyte further comprises at least one of a cyclic carbonate having a carbon-carbon double bond within the range of 0.01 wt % to 0.5 wt %, a fluorinated chain carbonate, and a compound having a sulfur-oxygen double bond.