ELECTROLYTIC SOLUTION, SECONDARY BATTERY AND ELECTRICAL DEVICE CONTAINING SAME
An electrolytic solution includes a solvent. The solvent includes a compound represented by Formula (1) below, in which R1 is a fluorinated C1 to C6 alkyl or a fluorinated C2 to C6 alkenyl, and R2 and R3 each independently are a hydrogen atom, a fluorine atom, or a fluorinated C1 to C6 alkyl. The solvent further includes ethylene carbonate. Based on a total weight of the solvent, a weight percent of the ethylene carbonate is less than or equal to 25 wt %.
1 . An electrolytic solution, comprising a solvent, wherein the solvent comprises a compound represented by Formula (1) below and ethylene carbonate, wherein, based on a total weight of the solvent, a weight percent of the ethylene carbonate is less than or equal to 25 wt %,
in Formula (1), R1 is a fluorinated C1 to C6 alkyl or a fluorinated C2 to C6 alkenyl; and R2 and R3 each independently are a hydrogen atom, a fluorine atom, or a fluorinated C1 to C6 alkyl.
2 . The electrolytic solution according to claim 1 , wherein, based on the total weight of the solvent, the weight percent of the ethylene carbonate is 5 wt % to 25 wt %.
3 . The electrolytic solution according to claim 1 , wherein, based on the total weight of the solvent, the weight percent of the ethylene carbonate is 10 wt % to 20 wt %.
4 . The electrolytic solution according to claim 1 , wherein, based on the total weight of the solvent, a weight percent of the compound represented by Formula (1) is 5 wt % to 35 wt %.
5 . The electrolytic solution according to claim 1 , wherein, based on the total weight of the solvent, a weight percent of the compound represented by Formula (1) is 10 wt % to 30 wt %.
6 . The electrolytic solution according to claim 1 , wherein, in the compound represented by Formula (1), R1 is a perfluoro C1 to C6 alkyl.
7 . The electrolytic solution according to claim 1 , wherein:
in the compound represented by Formula (1), R1 is —CF 3 or —C2F 5 , and R2 and R3, each independently, are a hydrogen atom or a fluorine atom.
8 . The electrolytic solution according to claim 1 , wherein:
the solvent further comprises dimethyl carbonate and/or carboxylate, and the carboxylate is at least one of methyl formate, ethyl formate, ethyl acetate, ethyl propionate, or propyl formate.
9 . The electrolytic solution according to claim 8 , wherein:
based on the total weight of the solvent, a weight percent W1 of the compound represented by Formula (1) and a weight percent W2 of the dimethyl carbonate and/or carboxylate satisfy: 1.5≤W2/W1≤3.
10 . The electrolytic solution according to claim 8 , wherein:
based on the total weight of the solvent, a weight percent W1 of the compound represented by Formula (1) and a weight percent W2 of the dimethyl carbonate and/or carboxylate satisfy: 2≤W2/W1≤2.5.
11 . The electrolytic solution according to claim 1 , further comprising:
an electrolyte salt, wherein the electrolyte salt comprises lithium bisfluorosulfonimide and lithium hexafluorophosphate;
wherein a volumetric molar concentration C1 of the lithium bisfluorosulfonimide in the electrolyte salt and a volumetric molar concentration C2 of the lithium hexafluorophosphate in the electrolyte salt satisfy: 0.25≤C1/C2≤9.
12 . The electrolytic solution according to claim 1 , further comprising:
an electrolyte salt, wherein the electrolyte salt comprises lithium bisfluorosulfonimide and lithium hexafluorophosphate;
wherein a volumetric molar concentration C1 of the lithium bisfluorosulfonimide in the electrolyte salt and a volumetric molar concentration C2 of the lithium hexafluorophosphate in the electrolyte salt satisfy: 1≤C1/C2≤4.
13 . The electrolytic solution according to claim 11 , wherein 0.2 mol/L≤C1≤0.9 mol/L and/or 0.1 M/L≤C2≤0.8 M/L.
14 . The electrolytic solution according to claim 11 , wherein, based on a total weight of the electrolytic solution, a weight percent A1 of the compound represented by Formula (1) and a weight percent A2 of the lithium bisfluorosulfonimide satisfy: 0.3≤A1/A2≤8.4.
15 . The electrolytic solution according to claim 11 , wherein, based on a total weight of the electrolytic solution, a weight percent A1 of the compound represented by Formula (1) and a weight percent A2 of the lithium bisfluorosulfonimide satisfy: 0.4≤A1/A2≤3.
16 . The electrolytic solution according to claim 1 , further comprising:
an additive, wherein the additive comprises vinylene carbonate.
17 . The electrolytic solution according to claim 16 , wherein, based on a total weight of the electrolytic solution, a weight percent of the vinylene carbonate is less than or equal to 5 wt %.
18 . The electrolytic solution according to claim 1 , wherein a viscosity of the electrolytic solution at 25° C. is less than or equal to 5 mPa·s.
19 . A secondary battery, comprising the electrolytic solution according to claim 1 .
20 . An electrical device, comprising the secondary battery according to claim 19 .