A secondary battery, comprising a negative electrode plate and an electrolyte, wherein the negative electrode plate comprises a negative electrode current collector and a negative electrode film disposed on at least one surface of the negative electrode current collector and comprising a negative electrode active material, and the electrolyte 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 ethylene carbonate and diethyl carbonate, a mass ratio of EC in the organic solvent is less than or equal to 20%, and a mass ratio of DEC in the organic solvent is less than or equal to 20%; the organic solvent further comprises ethyl methyl carbonate, and a mass ratio of EMC in the organic solvent is greater than 50%; the additive comprises an additive A and an additive B; and the additive A is selected from one or more of compounds represented by Formula 1 or Formula 2: wherein a value of n 1 is 0, 1, 2, 3, 4, or 5; a value of n 2 is 0, 1, 2, 3, 4, 5, 6, 7, 8, or 9; R 11, R 12, R 13, R 14, R 21, R 22, R 23, and R 24 are each independently selected from H, F, Cl, Br, I, substituted or unsubstituted C1~C10 chain alkyls, substituted or unsubstituted C1~C10 chain alkenyls, substituted or unsubstituted C1~C10 chain alkynyls, C1~C10 aliphatic groups, substituted or unsubstituted C3~C9 cyclic alkyls, substituted or unsubstituted C1~C10 alkoxies, substituted or unsubstituted C6~C20 aryls, or substituted or unsubstituted C3~C20 heteroaryls; and a substituent is selected from one or more of F, Cl, or Br; and the additive B is selected from one or more of compounds represented by Formula 3: wherein R 31, R 32, R 33, R 34, R 35, R 36, R 37, R 38 and R 39 are each independently selected from one or more of substituted or unsubstituted C1~C20 alkyls, substituted or unsubstituted C2~C20 alkenyls, substituted or unsubstituted C2~C20 alkynyls, or substituted or unsubstituted C6~C20 aryls, and a substituent is selected from one or more of F, Cl, or Br. the negative electrode active material comprises a silicon-based material; the organic solvent comprises ethylene carbonate and diethyl carbonate, a mass ratio of EC in the organic solvent is less than or equal to 20%, and a mass ratio of DEC in the organic solvent is less than or equal to 20%; the organic solvent further comprises ethyl methyl carbonate, and a mass ratio of EMC in the organic solvent is greater than 50%; the additive comprises an additive A and an additive B; and the additive A is selected from one or more of compounds represented by Formula 1 or Formula 2: wherein a value of n 1 is 0, 1, 2, 3, 4, or 5; a value of n 2 is 0, 1, 2, 3, 4, 5, 6, 7, 8, or 9; R 11, R 12, R 13, R 14, R 21, R 22, R 23, and R 24 are each independently selected from H, F, Cl, Br, I, substituted or unsubstituted C1~C10 chain alkyls, substituted or unsubstituted C1~C10 chain alkenyls, substituted or unsubstituted C1~C10 chain alkynyls, C1~C10 aliphatic groups, substituted or unsubstituted C3~C9 cyclic alkyls, substituted or unsubstituted C1~C10 alkoxies, substituted or unsubstituted C6~C20 aryls, or substituted or unsubstituted C3~C20 heteroaryls; and a substituent is selected from one or more of F, Cl, or Br; and the additive B is selected from one or more of compounds represented by Formula 3: wherein R 31, R 32, R 33, R 34, R 35, R 36, R 37, R 38 and R 39 are each independently selected from one or more of substituted or unsubstituted C1~C20 alkyls, substituted or unsubstituted C2~C20 alkenyls, substituted or unsubstituted C2~C20 alkynyls, or substituted or unsubstituted C6~C20 aryls, and a substituent is selected from one or more of F, Cl, or Br.