Metal lithium material with artificially constructed polymer SEI film and preparation and application thereof
A technology of polymer and metal lithium, applied in structural parts, active material electrodes, secondary battery manufacturing and other directions, can solve the problems of lithium dendrite growth and cracking, and achieve inhibiting the generation of lithium dendrites, the preparation method is simple, and the production The effect of mature technology
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[0029] Example 1:
[0030] A kind of preparation method that adopts commercial Kevlar fiber as raw material to obtain a kind of dispersion liquid for coating on the surface of lithium metal, and forms a layer of polymer artificial SEI film after solvent volatilization, comprising the following steps:
[0031] 1) 1.0 g of Kevlar fibers and 1.5 g of potassium hydroxide were added to 500 mL of anhydrous dimethyl sulfoxide, stirred and dissolved for 7 days to obtain a Kevlar nanofiber / dimethyl sulfoxide dispersion;
[0032] 2) Take 30 mL of the Kevlar nanofiber / dimethyl sulfoxide dispersion obtained in step 1) and add 60 mL of deionized water to obtain a large amount of flocs, and filter the Kevlar fibers into a membrane by vacuum filtration, And washed with 100 mL of anhydrous dimethyl sulfoxide, removed the membrane and dissolved it in 30 mL of anhydrous dimethyl sulfoxide, and stirred at 80 °C for 5 days to obtain a pure Kevlar nanofiber dispersion;
[0033] 3) Take 100 μL of ...
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[0041] Example 2:
[0042]1) 2.0 g of Kevlar fibers and 1.5 g of potassium hydroxide were added to 100 mL of anhydrous dimethyl sulfoxide, stirred and dissolved for 7 days to obtain a Kevlar nanofiber / dimethyl sulfoxide dispersion;
[0043] 2) Take 30 mL of the Kevlar nanofiber / dimethyl sulfoxide dispersion obtained in step 1) and add 90 mL of deionized water to obtain a large amount of flocs, and filter the Kevlar fibers into a membrane by vacuum filtration, And washed with 100 mL of anhydrous dimethyl sulfoxide, the membrane was removed and then dissolved in 10 mL of anhydrous dimethyl sulfoxide, and stirred at 30 °C for 2 days to obtain a pure Kevlar nanofiber dispersion;
[0044] 3) Take 10 mL of the pure Kevlar nanofiber dispersion obtained in the above steps, add dropwise to a 100 μm thick metal lithium belt, and use a scraper to coat the dispersion with a thickness of 200 μm, and then heat it on a heating table to a temperature of 90 ° C. By drying the dimethyl sulfoxi...
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[0045] Example 3:
[0046] 1) 2.0 g of Kevlar fibers and 1.5 g of potassium hydroxide were added to 100 mL of anhydrous dimethyl sulfoxide, stirred and dissolved for 7 days to obtain a Kevlar nanofiber / dimethyl sulfoxide dispersion;
[0047] 2) Take 30 mL of the Kevlar nanofiber / dimethyl sulfoxide dispersion obtained in step 1) and add 90 mL of deionized water to obtain a large amount of flocs, and filter the Kevlar fibers into a membrane by vacuum filtration, And washed with 100 mL of anhydrous dimethyl sulfoxide, removed the membrane and dissolved it in 10 mL of anhydrous dimethyl sulfoxide, and stirred at 70 °C for 2 days to obtain a pure Kevlar nanofiber dispersion.
[0048] 3) Take 100 μL of the pure Kevlar nanofiber dispersion obtained in the above steps, drop it on a metal lithium sheet with a thickness of 500 μm, and then heat it to 50 ° C on a heating table to dry the dimethyl sulfoxide solvent to obtain a polymer with polymer Lithium metal materials for artificial S...
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