Single-ion conductive polymer electrolyte and preparation method and application thereof
A conductive polymer and single-ion technology, applied in solid electrolytes, non-aqueous electrolytes, circuits, etc., can solve the problems of reduced mechanical properties of electrolytes, loss of self-supporting properties, and reduced safety performance of lithium metal batteries to solve voltage loss, Effects of inhibiting growth and improving cycle performance
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Embodiment 1
[0028] Single-ion conductive polymer electrolyte, its chemical formula is as follows:
[0029]
Embodiment 2
[0031] Preparation of single ion conducting polymer electrolyte:
[0032] S1. Add 206.2g of sodium p-vinylbenzenesulfonate and 1g of 4-tert-butylcatechol to a round bottom flask equipped with magnetons, add acetonitrile to make it completely dissolved, and use a constant pressure dropping funnel to the flask under stirring conditions. Slowly add 80g of hypochlorous acid dropwise in the mixture, continue to stir and react for 8h after the dropwise addition, collect the organic phase and transfer to a round-bottomed flask equipped with a spherical condenser, add 300g of mass fraction in the bottle to be 20% aqueous sodium hydroxide solution, Heated to reflux for 12 hours, distilled off the solvent under reduced pressure, and washed the obtained product three times with deionized water to obtain 218.6 g of sodium p-1,2-dihydroxyethylbenzenesulfonate with a yield of 91%;
[0033] S2. Add 218.6g of p-1,2-dihydroxyethylbenzenesulfonate to a round bottom flask equipped with a magnet,...
Embodiment 3
[0036] Preparation of single-ion conductive solid polymer electrolyte membrane:
[0037] Take 20 g of the lithium salt of the single-ion conductive polymer prepared in Example 2 and dissolve it in an appropriate amount of methanol, stir for 10 hours to obtain a uniform slurry, apply the obtained slurry evenly on a polytetrafluoroethylene plate, and continue to vacuum at 60 ° C after the solvent evaporates. Dry for 24 hours to obtain a single-ion conductive solid polymer electrolyte membrane with a thickness of 200 μm.
[0038] Performance tests were performed on the single-ion conductive solid polymer electrolyte membrane and the traditional solid polymer electrolyte membrane (LiTFSI / PEO) prepared above, and the test results were compared. The test results are listed in Table 1.
[0039] The above performance tests include conductivity, lithium ion migration number and oxidation potential test. The test methods are as follows:
[0040] Conductivity: In a high-purity argon atm...
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