High temperature and high voltage resistant lithium ion battery electrolyte and lithium ion battery
A lithium ion battery and electrolyte technology, applied in the field of electrochemistry, can solve the problems of unknown high temperature cycle performance and high cost of raw materials, and achieve the effects of low cost, improved cycle performance and strong operability
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Embodiment 1
[0030] In an argon glove box with a water content of less than 10ppm, the lithium-ion battery electrolyte is prepared, and the lithium salt LiPF 6 Soluble in a mixed solvent of EC / EMC (mass ratio 1:1), in which LiPF 6 The final concentration of VC is 1mol / L, and the addition type of other additives is VC, which accounts for 2% of the total mass of the electrolyte. Divide the above electrolytic solution into 4 parts on average, add 0.5%, 1% or 2% of 2-fluorobiphenyl to the total mass of the electrolytic solution respectively in three parts, and do not add to the other part, prepare 1.9Ah with these four kinds of electrolytic solutions respectively , 4.35V LCO lithium-ion battery, conduct normal temperature cycle test, test battery discharge capacity and capacity retention rate. The capacity cycle curve is attached figure 1 , the capacity retention rate is shown in Table 1.
[0031] Table 1
[0032]
[0033] The results showed that compared with the blank formula, the add...
Embodiment 2
[0035] In an argon glove box with a water content of less than 10ppm, the lithium-ion battery electrolyte is prepared, and the lithium salt LiPF 6 Soluble in a mixed solvent of EC / EMC (mass ratio 1:1), in which LiPF 6 The final concentration of VC is 1mol / L, and the addition type of other additives is VC, which accounts for 2% of the total mass of the electrolyte. Divide the above electrolytic solution into 5 parts on average, add 0.5%, 1%, 2% and 2.5% of 2,4-difluorobiphenyl to the total mass of the electrolytic solution respectively in four parts, and add 2,4-difluorobiphenyl to the other part. A 1.9Ah, 4.35V LCO lithium-ion battery was prepared with an electrolyte solution, and a normal temperature cycle test was performed to test the battery discharge capacity and capacity retention rate. The capacity cycle curve is attached figure 2 , the capacity retention rate is shown in Table 2.
[0036] Table 2
[0037]
[0038] The results showed that compared with the blank...
Embodiment 3
[0040] in an argon-filled glove box (H 2 O6 Soluble in a mixed solvent of EC / EMC (mass ratio 1:1), in which LiPF 6The final concentration is 1M, and the addition type of other additives is VC, accounting for 2% of the total mass of the electrolyte. Divide the above electrolyte into three parts on average, add 2-fluorobiphenyl or 2,4-difluorobiphenyl accounting for 2% of the total mass of the electrolyte to two parts, and add the other part without adding these three electrolytes A 4.2V / 1.3Ah LCO lithium-ion battery was prepared and subjected to a high-temperature cycle test at 60°C to test the discharge capacity of the battery. The capacity cycle curve is attached image 3 shown.
[0041] The results were compared and found that after high temperature cycling at 60°C, the discharge capacity and capacity retention rate of batteries containing 2% 2-fluorobiphenyl and 2,4-difluorobiphenyl were significantly higher than those without adding additives, and the addition of additi...
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