Effect of bis(fluorosulfonyl)imide addition on the performance of electrolyte
The addition of bis(fluorosulfonyl)imide(LiFSI)can improve the conductivity and stability of electrolyte,but will corrode the aluminum foil.The effect of LiFSI content on corrosion of aluminum foil and the battery performance is studied by adjusting the ratio of LiFSI and lithium hexafluorophosphate(LiPF6)in the electrolyte.The CV test results show that with the increase of LiFSI content,the corrosion effect of the electrolyte on the aluminum foil is enhanced.When the mass fraction of LiFSI is 12.5％,the aluminum foil begin to corrode at about 3.5 V at 25 ℃ and about 3.8 V at 45 ℃.The cycle performance test results show that when the mass fraction of LiFSI and LiPF6 is 6.0％and 6.5％respectively,the lithium iron phosphate Li-ion battery is charged at 0.5 C and discharged at 1.0 C in 2.50-3.65 V,the capacity retention rate is 99.5％after 3 500 cycles at 25 ℃.
万方数据
维普
