A high-voltage ternary cathode material system lithium-ion battery electrolyte
A technology of lithium ion battery and positive electrode material, which is applied in the field of high voltage ternary positive electrode material system lithium ion battery electrolyte, can solve the problems of large irreversible capacity of first charge and discharge, loss of reversible capacity of battery, inability to effectively suppress gas production, etc. The effect of high capacity retention and capacity recovery, improved thermal stability, improved cycle performance and high temperature performance
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Embodiment 1
[0028] In a glove box filled with argon, add methanedisulfonate in sequence to the mixed non-aqueous solvent of ethylene carbonate, propylene carbonate, ethyl methyl carbonate and diethyl carbonate with a mass ratio of 25:5:15:55. Methyl ester, lithium bis(fluorosulfonyl)imide, succinic anhydride (accounting for 0.5%, 1.0%, and 1.0% of the total mass of the electrolyte), ethylene carbonate, succinonitrile, and 1,2-bis (2-cyanoethoxy) ethane (addition accounts for 0.2%, 2.0% and 0.5% of the total mass of the electrolyte) additive; finally slowly add lithium hexafluorophosphate accounting for 12.5% of the total mass of the electrolyte to the mixed solution, and stir evenly Obtain the lithium ion battery electrolyte of embodiment 1 afterward.
Embodiment 2
[0030] In a glove box filled with argon, add methylene disulfonate, bis(tri Lithium fluoromethanesulfonyl)imide, succinic anhydride (the amount added is 2.0%, 0.5%, 0.5% of the total mass of the electrolyte), vinyl sulfate, 1,3-propane sultone and 1,3,6 -Hexane trinitrile (addition accounts for 0.5%, 1.0% and 2.0% of the total mass of the electrolyte) additive; finally slowly add lithium hexafluorophosphate accounting for 13.0% of the total mass of the electrolyte to the mixed solution, and stir to obtain Example 2 lithium-ion battery electrolyte.
Embodiment 3
[0032] In a glove box filled with argon gas, methylene disulfonate, bis(fluorosulfonate Lithium imide, methyl succinic anhydride (accounting for 0.5%, 2.0%, 1.0% of the total mass of the electrolyte) and vinylene carbonate, adiponitrile and 1,2-bis(2-cyanoethoxy Base) ethane (the addition accounts for respectively 0.5%, 2.0% and 0.5% of the total mass of the electrolytic solution) additive; Finally, slowly add lithium hexafluorophosphate accounting for 12% of the total mass of the electrolytic solution to the mixed solution, and obtain the solution of Example 3 after stirring evenly. Lithium-ion battery electrolyte.
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