ELECTROLYTE SOLUTION AND LITHIUM-ION BATTERY COMPRISING SAME
The embodiments of the present application provide an electrolyte solution and a lithium-ion battery comprising the same. The electrolyte solution includes a solvent, a lithium salt and a first additive, and the first additive has a molecular formula of wherein R is at least one of an H element, a halogen element or an alkyl group having 1 to 3 carbon atoms. The electrolyte solution provided in the embodiments of the present application has the advantages of having a long shelf life, avoiding the problem of the performance decline of lithium-ion batteries due to deterioration of electrolyte solutions, being capable of inhibiting an increase of internal resistance of the lithium-ion batteries in low-temperature cycles, and improving the performance of the lithium-ion batteries.
1 . An electrolyte solution, comprising:
a solvent, a lithium salt and a first additive;
the first additive having a molecular formula of
wherein R is at least one of an H element, a halogen element or an alkyl group having 1 to 3 carbon atoms.
2 . The electrolyte solution according to claim 1 , wherein the R is the H element, and the first additive is 1,2,4-triazole.
3 . The electrolyte solution according to claim 1 , wherein based on 100 parts by weight of the electrolyte solution, the amount of the first additive is 0.1-3 parts by weight.
4 . The electrolyte solution according to claim 1 , further comprising a second additive which is ethylene sulfate.
5 . The electrolyte solution according to claim 4 , wherein based on 100 parts by weight of the electrolyte solution, the amount of the second additive is 0.1-1 part by weight.
6 . The electrolyte solution according to claim 1 , wherein a molar concentration of the lithium salt in the solvent is 0.8-1.5 mol/L.
7 . The electrolyte solution according to claim 1 , wherein the solvent comprises at least one of diethyl carbonate, methyl ethyl carbonate, propylene carbonate, dimethyl carbonate, ethylene carbonate, ethyl acetate and ethyl propionate.
8 . The electrolyte solution according to claim 6 , wherein the solvent comprises ethylene carbonate and diethyl carbonate, and a mass ratio of the ethylene carbonate to the diethyl carbonate is 3:7.
9 . A lithium-ion battery comprising the electrolyte solution according to claim 1 .