Lithium secondary battery electrolyte and lithium secondary battery containing same
A lithium secondary battery, electrolyte technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve the problems of poor ionic conductivity, unable to meet battery performance requirements, poor stability, etc., to reduce mass transfer. resistance, the effect of reducing the resistance of the SEI film and improving the toughness
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specific Embodiment approach 1
[0021] An electrolyte solution for a lithium secondary battery, comprising an organic solvent, a conductive lithium salt and additives, the additives comprising at least one borate compound, at least one phosphate compound and at least one cyclic sulfate compound.
[0022] Further, the amount of the borate compound accounts for 0.01% to 5% of the total mass of the electrolyte, the amount of the phosphate compound accounts for 0.01% to 3% of the total mass of the electrolyte, and the amount of the cyclic sulfate compound The dosage accounts for 0.01%-10% of the total mass of the electrolyte, the conductive lithium salt accounts for 8%-20% of the total mass of the electrolyte of the lithium secondary battery, and the rest is an organic solvent.
[0023] Further, the borate compound is selected from at least one of trimethyl borate, triethyl borate, tripropyl borate, triisopropyl borate, triphenyl borate, tris(trimethylsilane) borate A sort of.
[0024] Further, the phosphate co...
Embodiment 1
[0033] A lithium secondary battery electrolyte, comprising an organic solvent, a conductive lithium salt and additives, the organic solvent accounts for 79.99% of the total mass of the lithium secondary battery electrolyte, and the organic solvent includes a cyclic solvent (ethylene carbonate) and Linear solvent (ethyl methyl carbonate), the mass ratio of the ethylene carbonate and ethyl methyl carbonate is 1:5; the conductive lithium salt is lithium hexafluorophosphate, and the lithium hexafluorophosphate accounts for 8.00% of the total mass of the lithium secondary battery electrolyte ; The additive includes at least one borate compound, at least one phosphate compound and at least one cyclic sulfate compound, the borate compound is trimethyl borate, and the trimethyl borate accounts for the electrolyte 0.01% of the total mass; the phosphate compound is oxalic acid phosphate, and the oxalic acid phosphate accounts for 2% of the total mass of the electrolyte; the cyclic sulfur...
Embodiment 2
[0036] A lithium secondary battery electrolyte, comprising an organic solvent, a conductive lithium salt and additives, the organic solvent accounts for 82.99% of the total mass of the lithium secondary battery electrolyte, and the organic solvent includes a cyclic solvent (ethylene carbonate) and Linear solvent (ethyl methyl carbonate), the mass ratio of ethylene carbonate and ethyl methyl carbonate is 2:5; the conductive lithium salt is lithium hexafluorophosphate, and lithium hexafluorophosphate accounts for 12% of the total mass of the electrolyte solution of lithium secondary battery ; The additive includes at least one borate compound, at least one phosphate compound and at least one cyclic sulfate compound, the borate compound is tripropyl borate, and the tripropyl borate accounts for the electrolyte 2% of the total mass; the phosphate compound is oxalic acid phosphate, and the oxalic acid phosphate accounts for 3% of the total mass of the electrolyte; the cyclic sulfuri...
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