Lithium-ion secondary battery and power consuming device

A power consuming device, comprising a lithium-ion secondary battery, wherein the lithium-ion secondary battery comprises a positive electrode, a negative electrode, and an electrolyte,

• wherein the positive electrode comprises a positive electrode current collector and an active layer coated on at least one surface of the positive electrode current collector, and the active layer comprises a positive electrode active material, the positive electrode active material comprising a lithium cobalt oxide material and a lithium nickel cobalt manganese oxide ternary material, with the mass content percentage of the lithium nickel cobalt manganese oxide ternary material being d % based on the total mass of the positive electrode active material, where 1≤d≤50;
• and wherein the electrolyte comprises a compound A, a compound B, and a compound C, wherein the compound B comprises a polyether nitrile compound, the compound C comprises 1,3,6-hexanetricarbonitrile;
• the compound A has a structure as represented by the following general formula:
• wherein L is O or a linking bond;
• R is selected from one of C2-C6alkyl which is unsubstituted or substituted with Ra, C2-C6alkenyl which is unsubstituted or substituted with Ra, C2-C6 alkynyl which is unsubstituted or substituted with Ra, C2-C6 nitrogen-containing heteroaryl which is unsubstituted or substituted with Ra, C6-C12 aryl which is unsubstituted or substituted with Ra, wherein each substituent Ra is independently selected from fluoro or C1-C6fluoroalkyl;
• and R1 is selected from one of fluoro or C1-C6 fluoroalkyl;
• based on the total mass of the electrolyte, the mass content percentage of the compound A is a %, where 0.1≤a≤15;
• the mass content percentage of the compound B is b %, where 0.1≤b≤5;
• and the mass content percentage of the compound C is 0.1≤c≤5;
• and 0.3≤d/(b+c)≤20 and 0.02≤a/(b+c)≤2 are satisfied.