Secondary battery and device comprising the same

A secondary battery, comprising:

• a negative electrode plate that comprises a negative electrode film, wherein the negative electrode film comprises a negative electrode active material;
• electrolyte that comprises an electrolyte salt, an organic solvent and an additive, wherein
• the negative electrode active material comprises a silicon-based material;
• the organic solvent comprises dimethyl carbonate (DMC), ethylene carbonate (EC), and ethyl methyl carbonate (EMC), wherein a mass ratio of the dimethyl carbonate (DMC) in the organic solvent is ≤20%, a mass ratio of the ethylene carbonate (EC) in the organic solvent is ≤15%, a mass ratio of the ethyl methyl carbonate (EMC) in the organic solvent is 65%˜95%;
• and
• the additive comprises one or more of compound shown in Formula 1 below, wherein a mass ratio of the compound shown in Formula 1 in the electrolyte is ≤1%;
• where, R1 is selected from one or more of C2˜C4 alkylene or halogenated alkylene, C2˜C4 alkenylene or halogenated alkenylene, C6˜C18 arylene and derivatives thereof.