Preparation and application of a polybenzimidazole-based single-ion polymer gel electrolyte
A polybenzimidazole-based mono- and polybenzimidazole-based technology, which is applied in the field of preparation of polybenzimidazole-based single-ion polymer gel electrolytes, can solve the problems of accelerating lithium dendrite growth, low lithium ion migration number, and affecting Battery performance and other issues, to achieve the effect of improving ionic conductivity, improving mechanical strength, and improving interface stability
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Embodiment 1
[0044] The synthesis of embodiment 1 polybenzimidazole-based single ion polymer
[0045] (1) Synthesis of lithium 3-chloropropanesulfonyl trifluoromethylsulfonyl imide
[0046] Under a nitrogen atmosphere, 4.068g of lithium hydroxide and 12.627g of trifluoromethanesulfonamide were added to a 100mL round bottom flask, and then 85mL of acetonitrile was added, and magnetically stirred in an ice-water bath for 0.5h. Then 15 g of 3-chloropropanesulfonyl chloride was added dropwise to the flask. After the dropwise addition was complete, the temperature was raised to room temperature and reacted for 24h. Then, the mixture was filtered to remove insoluble salts and dried under vacuum to obtain a viscous liquid. Then recrystallize the viscous liquid in dichloromethane to obtain a pure white solid, which is lithium 3-chloropropanesulfonyltrifluoromethylsulfonyl imide. The chemical structure of lithium 3-chloropropanesulfonyltrifluoromethylsulfonylimide is as follows:
[0047]
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Embodiment 2
[0053] Example 2 Synthesis of single-ion polymer gel electrolyte (polybenzimidazole-based single-ion polymer: PVDF-HFP=1:1)
[0054] Mix the polybenzimidazole-based single-ion polymer obtained in step (2) of Example 1 with PVDF-HFP at a mass ratio of 1:1 to obtain a mixture, and then dissolve the mixture in N-methylpyrrolidone to obtain a cast Then cast the casting solution on a clean glass plate, place it in a vacuum oven, dry it at 80°C for 12 hours, then vacuumize it, and dry it at 100°C for 24 hours to obtain an electrolyte membrane, and then put the electrolyte membrane Soak in ethylene carbonate / propylene carbonate (volume ratio 1:1) to obtain a single-ion polymer gel electrolyte.
[0055] The single-ion polymer gel electrolyte obtained in Example 2 was assembled into a button battery and tested for performance. At room temperature, the discharge specific capacity at 0.2C reached 150mA·h / g, and the lithium ion migration number was 0.91.
Embodiment 3
[0056] Example 3 Synthesis of single-ion polymer gel electrolyte (polybenzimidazole-based single-ion polymer: PVDF-HFP=1:2)
[0057] Mix the polybenzimidazole-based single-ion polymer obtained in step (2) of Example 1 with PVDF-HFP at a mass ratio of 1:2 to obtain a mixture, and then dissolve the mixture in N-methylpyrrolidone to obtain a cast film liquid, and then cast the casting solution on a clean glass plate, place it in a vacuum oven, dry it at 80°C for 12 hours, then vacuumize it, and dry it at 100°C for 24 hours to obtain an electrolyte membrane, and then put the electrolyte membrane on Soak in ethylene carbonate / propylene carbonate (volume ratio 1:1) to obtain a single-ion polymer gel electrolyte.
[0058] The single-ion polymer gel electrolyte obtained in Example 3 was assembled into a button battery and tested for performance. At room temperature, the discharge specific capacity at 0.2C reached 145mA·h / g, and the lithium ion migration number was 0.89.
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