Electrolyte and lithium ion battery containing same

[0033] Example 1

[0034] (1) Preparation of polyborosiloxane: In a 250mL round-bottom flask, add a certain amount of boric acid, polydimethylsiloxane and methanol, stir evenly, and react at 120 ° C for 2 hours. After the reaction is completed, use, Ethanol washing several times, vacuum drying to obtain polyborosiloxane M1, its chemical formula is as follows, wherein the value range of the degree of polymerization n is between 20-25:

[0035]

[0036] (2) Positive electrode preparation: The ternary positive electrode material NCM811, conductive carbon black, and binder PVDF were added to the stirring tank according to the mass ratio of 95:2.5:2.5, and an appropriate amount of N-methylpyrrolidone was added, and then fully stirred to obtain a viscosity solid content Moderate positive electrode slurry; the positive electrode slurry is evenly coated on the aluminum foil, and the positive electrode sheet is obtained after drying, rolling and slitting.

[0037] (3) Negative electro

[0040] Example 2

[0041] The battery was prepared in the same way as in Example 1, except that the amount of polyborosiloxane added accounted for 1.0% of the total mass of the electrolyte, vinylene carbonate (VC) accounted for 1.0% of the total mass of the electrolyte, and the organic solvent accounted for 1.0% of the total mass of the electrolyte. 87.3% of total electrolyte mass, LiPF 6 It accounts for 10.7% of the total mass of the electrolyte.

[0042] Example 3

[0043] The battery was prepared in the same way as in Example 1, except that the amount of polyborosiloxane added accounted for 3.0% of the total mass of the electrolyte, vinylene carbonate (VC) accounted for 1.0% of the total mass of the electrolyte, and the organic solvent accounted for 3.0% of the total mass of the electrolyte. 85.5% of total electrolyte mass, LiPF 6 It accounts for 10.5% of the total mass of the electrolyte.