Lithium ion electrolytic solution preventing over charge and lithium ion battery made therefrom

[0014] Mix ethylene carbonate, dimethyl carbonate, and methyl ethyl carbonate in a ratio of 1:1:1, add a certain amount of lithium hexafluorophosphate to it to prepare a 1mol / L electrolyte, and then add the The additive N-phenylimide is dissolved to prepare the electrolyte solution of the present invention. Based on the weight of the electrolyte, the composition of the additive is:

[0015] N-phenylimide 1wt.%.

[0016] Preparation of positive electrode: a certain amount of LiCoO 2 and acetylene black are evenly dispersed in a solvent made of polyvinylidene fluoride (PVDF) dissolved in N-methyl-2-pyrrolidone (NMP) to obtain a uniform slurry, coated with aluminum foil and dried in a vacuum at 120°C After 12 hours, the positive electrode sheet was obtained after calendering.

[0017] Preparation of the negative electrode: A certain amount of carbon mesophase microspheres (CMS) and acetylene black are uniformly dispersed in a solvent in which polyvinylidene fluoride (PVDF) is d

[0020] Mix ethylene carbonate, dimethyl carbonate, and methyl ethyl carbonate in a ratio of 1:1:1, add a certain amount of lithium hexafluorophosphate to it to prepare a 1mol / L electrolyte, and then add additives to it , making it dissolve to prepare the electrolyte solution of the present invention. Based on the weight of the electrolyte, the composition of the additive is:

[0021] N-phenylimide 3wt.%.

[0022] According to the same method as in Example 1, a lithium-ion secondary battery was prepared using the electrolyte solution obtained in this example.

[0024] Mix ethylene carbonate, dimethyl carbonate, and methyl ethyl carbonate in a ratio of 1:1:1, add a certain amount of lithium hexafluorophosphate to it to prepare a 1mol / L electrolyte, and then add additives to it , making it dissolve to prepare the electrolyte solution of the present invention. Based on the weight of the electrolyte, the composition of the additive is:

[0025] N-phenylimide 5wt.%.

[0026] According to the same method as in Example 1, a lithium-ion secondary battery was prepared using the electrolyte solution obtained in this example.