High-voltage electrolyte for lithium battery
An electrolyte and lithium battery technology, which is applied in the direction of lithium batteries, secondary batteries, non-aqueous electrolyte batteries, etc., can solve the problems of fast capacity decay, low Coulombic efficiency, and poor high-voltage resistance, and achieve good film-forming performance and wide Electrochemical window, the effect of excellent compatibility
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Embodiment 1
[0062] A kind of high-voltage electrolytic solution for lithium battery, its preparation method is as follows:
[0063] A certain amount of LiPF 6 Slowly dissolve in EC and DEC with a volume ratio of 1:1, and then slowly add high-voltage additive N,N-dimethyltrimethylsilylamine (CAS No.: 2083-91-2, structural formula as figure 1 shown), making the LiPF 6 The concentration is 0.1mol / L, so that the high-voltage additive N,N-dimethyltrimethylsilylamine accounts for 0.1% of the total mass of the electrolyte, and the mixture is uniform until it is completely clear, and the high-voltage electrolyte for lithium batteries is obtained. .
[0064] Figure 8 The electrolytic solution prepared for embodiment 1 was in LiNi 0.8 co 0.1 mn 0.1 o 2 / Cycle life curves in MCMB batteries. Depend on Figure 8 It can be seen that the capacity retention rate of the above electrolyte is as high as 90% and the average Coulombic efficiency is as high as 99.9% or more after 200 cycles at the cu...
Embodiment 2
[0066] A kind of high-voltage electrolytic solution for lithium battery, its preparation method is as follows:
[0067] A certain amount of LiFSI was slowly dissolved in EC and DMC with a volume ratio of 3:7, and then the high voltage additive N,N-bis(trimethylsilyl)glycine methyl ester (CAS No.: 25688-73 -7, the structural formula is as figure 2 shown), make the concentration of LiFSI 1mol / L, make the high-voltage additive N,N-bis(trimethylsilyl)glycine methyl ester account for 1% of the total mass of the electrolyte, stir until the electrolyte is completely clear, and obtain High voltage electrolyte for lithium batteries.
[0068] Figure 9 The electrolyte prepared for Example 2 was in LiCoO 2 / Li cycle life curves in Li batteries. Depend on Figure 9It can be seen that even when the charging cut-off voltage is as high as 4.6V, the capacity retention rate can still be 87% after 200 cycles, and the average Coulombic efficiency is as high as 99.9%. Compared with convent...
Embodiment 3
[0070] A kind of high-voltage electrolytic solution for lithium battery, its preparation method is as follows:
[0071] Slowly dissolve a certain amount of LiDFOB in EC and MPC with a volume ratio of 1:1, and then slowly add high-voltage additive acetamide silane (CAS number: 5661-22-3, structural formula as image 3 shown), make the concentration of LiDFOB 2mol / L, make the high-voltage additive acetamidosilane account for 2% of the total mass of the electrolyte, stir until the electrolyte is completely clear, and obtain a high-voltage electrolyte for lithium batteries.
[0072] Figure 10 The electrolytic solution prepared for embodiment 3 was in LiNi 0.8 co 0.1 mn 0.1 o 2 / Charge and discharge curves in MCMB batteries. Depend on Figure 10 It can be seen that LiNi 0.8 co 0.1 mn 0.1 o 2 The positive electrode material can be charged and discharged efficiently and reversibly in the above-mentioned high-voltage electrolyte. Even at a high charge cut-off voltage of 4....
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