Lithium secondary battery electrolyte with low internal resistance and lithium secondary battery
A lithium secondary battery and electrolyte technology, applied in secondary batteries, secondary battery repair/maintenance, non-aqueous electrolyte storage batteries, etc., can solve the problem of unstable battery cycle, affecting the overall performance of the battery, and complex SEI film composition and morphology and other problems, to achieve the effect of reducing internal resistance and good low temperature performance
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[0029] Example 1
[0030] (1) Preparation of positive electrode sheet for lithium secondary battery
[0031] The positive active material lithium nickel cobalt manganese (LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O 2 ), conductive agent Super-P, adhesive PVDF according to the mass ratio 96:2.0:2.0 dissolved in the solvent N-methylpyrrolidone and mixed uniformly to make a positive electrode slurry, and then uniformly coat the positive electrode slurry on the current collector aluminum foil , The coating amount is 0.018g / cm 2 After drying at 85°C, cold pressing, trimming, cutting, and slitting are performed, and then dried at 85°C for 4 hours under vacuum conditions, and the tabs are welded to make the positive electrode sheet of the lithium secondary battery that meets the requirements.
[0032] (2) Preparation of negative electrode sheet for lithium secondary battery
[0033] The negative electrode active material graphite, conductive agent Super-P, thickener CMC, and binder SBR are dissolved in the sol...
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[0038] Example 2
[0039] The lithium secondary battery was prepared according to the method of Example 1. The difference is that the electrolyte of the lithium secondary battery uses 10.0% of the total mass of the electrolyte as the lithium salt, and the non-aqueous organic solvent is ethylene carbonate and ethyl methyl carbonate. It accounts for 85.5% of the total mass of the electrolyte, and the mass ratio is 1:2. Add sodium tetrafluorophosphate, which accounts for 0.5% of the total mass of the electrolyte. The second additives are fluoroethylene carbonate and lithium difluorophosphate, which respectively account for 3.0% and 1.0% of the total mass of the electrolyte. The cathode material used in lithium secondary batteries is LiNi 0.8 Co 0.1 Mn 0.1 O 2 .
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[0040] Example 3
[0041] The lithium secondary battery was prepared according to the method of Example 1. The difference is that the electrolyte of the lithium secondary battery uses 13.0% of the total mass of the electrolyte as the lithium salt, and the non-aqueous organic solvent is ethylene carbonate and ethyl methyl carbonate. It accounts for 85.0% of the total mass of the electrolyte, and the mass ratio is 1:3. Potassium tetrafluorophosphate is added to account for 0.5% of the total mass of the electrolyte. The second additive is fluoroethylene carbonate, which accounts for 1.5% of the total mass of the electrolyte. The cathode material used in lithium secondary batteries is LiNi 0.8 Co 0.15 Al 0.05 O 2 .
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