Electrolyte, electrochemical device and electronic device

An electrochemical device comprising:

• a cathode;
• an anode comprising an anode active substance;
• an isolation film disposed between the cathode and the anode;
• and
• an electrolyte, wherein the electrolyte comprises a fluoroethylene carbonate and a P—N bond-containing compound;
• and the P—N bond-containing compound comprises a compound having a structure shown in Formula I:
• wherein R0 represents On, wherein n is 0 or 1;
• R1, R2, R3, R4, R5, and R6 are each independently selected from C1-C6 alkyl, C2-C6 alkenyl, C2-C6 alkynyl, or C1-C6 alkoxy;
• or R1 and R2, R3 and R4, or R5 and R6 are interconnected to form, together with an N atom, a cyclic group with 2-5 carbon atoms;
• and
• based on a mass of the electrolyte, a mass percentage of the fluoroethylene carbonate in the electrolyte is a %, a mass percentage of the P—N bond-containing compound in the electrolyte is b %, and 0.1≤a/b≤200;
• wherein a ratio W:K is in a range of 0.12 to 1.15, W represents a content value of the compound of Formula I required per unit capacity in units of g/Ah,
• K represents a value of a specific surface area per unit mass of the anode active substance in units of m2/g, and 1.0≤K≤2.0.