Electrolyte and electrochemical device

An electrochemical device, wherein the electrochemical device comprises electrodes and an electrolyte comprising a dinitrile compound, a trinitrile compound, and propyl propionate;

• wherein, based on the total weight of the electrolyte, the weight percentage of the dinitrile compound is X and the weight percentage of the trinitrile compound is Y, and a weight percentage of the propyl propionate is Z;
• wherein,
• About 2 wt %<(X+Y)≤about 11 wt %,
• about 0.1≤(X/Y)≤about 4,
• about 30 wt %≤Z≤about 50 wt %,
• about 2 wt %<X≤about 6 wt %, and
• about 0.01<(Y/Z)≤about 0.3;
• wherein the trinitrile compound comprises at least one selected from the group consisting of:
• 1,3,5-pentanetricarbonitrile;
• 1,2,3-propanetrinitrile;
• 1,3,6-hexanetricarbonitrile;
• 1,2,6-hexanetricarbonitrile;
• 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.

An electronic device, comprising an electrochemical device that includes electrodes and an electrolyte comprising a dinitrile compound, a trinitrile compound, and propyl propionate;

• wherein, based on the total weight of the electrolyte, the weight percentage of the dinitrile compound is X and the weight percentage of the trinitrile compound is Y and a weight percentage of the propyl propionate is Z;
• wherein,
• about 2 wt %<(X+Y)≤about 11 wt %;
• about 0.1≤(X/Y)≤about 4,
• about 30 wt %≤Z≤about 50 wt %,
• about 2 wt %<X≤about 6 wt %, and
• about 0.01<(Y/Z)≤about 0.3;
• wherein the trinitrile compound comprises at least one selected from the group consisting of:
• 1,3,5-pentanetricarbonitrile;
• 1,2,3-propanetrinitrile;
• 1,3,6-hexanetricarbonitrile;
• 1,2,6-hexanetricarbonitrile;
• 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.