Composite lithium negative electrode with layered and vertical orientation structure as well as preparation and application
A vertically oriented, layered structure technology, applied to structural parts, battery electrodes, electrical components, etc., can solve the problems of decreased Coulombic efficiency, dry electrolyte, lithium metal volume change, etc., to reduce the risk of short circuit and alleviate volume expansion , the effect of improving Coulombic efficiency
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Embodiment 1
[0029] The fiber skeleton in this embodiment is a polyacrylonitrile fiber membrane. The preparation method is as follows: dissolving 1g of polyacrylonitrile (molecular weight = 150,000) in 9g of N,N-dimethylformamide (DMF) to prepare a solution with a concentration of 10wt%. The spinning precursor solution was injected into the syringe, the distance between the needle and the roller was 15 cm, the high voltage electric field strength was 16 kV, and the rotation speed of the roller was 200 rpm. The thickness of the collected spun film was 40 μm. The spun film was cut into strips with a width of 30 cm.
[0030] In the drying room (dew point below -35°C), the above-mentioned PAN nanofibers were stacked on the surface of the lithium strip (the thickness of the lithium strip was 100 μm, and the width was 30 cm). The spun film is bonded to the lithium metal surface by rolling through a double-roller machine.
[0031] The above-mentioned lithium negative electrode / spun film is rol...
Embodiment 2
[0036] The fiber skeleton in this embodiment is polyvinylpyrrolidone / titanium dioxide (PVP / TiO 2 ) composite fiber membrane. The preparation method is as follows: dissolve 1 g of polyvinylpyrrolidone (molecular weight = 1.3 million) in 7.5 mL of ethanol and 2.5 mL of N,N-dimethylformamide (DMF) to prepare solution A. Solution B was prepared by dissolving 2.5g tetrabutyl titanate in 7.5mL ethanol and 2.5mL acetic acid. Mix and stir solution A and solution B to form a spinning precursor. The spinning precursor solution was injected into the syringe, the distance between the needle and the roller was 15 cm, the high-voltage electric field strength was 16 kV, and the rotation speed of the roller was 400 rpm. The thickness of the collected spun film was 30 μm. The spun film was cut into strips with a width of 30 cm.
[0037] The above-mentioned lithium negative electrode / spun membrane is rolled into a cylindrical core wrapped in layers, in which lithium foil and PVP / TiO 2The f...
Embodiment 3
[0040] The fiber skeleton in this embodiment is a polyvinylidene fluoride-hexafluoropropylene fiber membrane. The preparation method is as follows: dissolving 2g of polyvinylidene fluoride-hexafluoropropylene (molecular weight=400,000) in 6.2mL of acetone and 5.2mL of N,N-dimethylformamide (DMF) to prepare a spinning precursor solution. The spinning precursor solution was injected into the syringe, the distance between the needle and the roller was 15 cm, the high voltage electric field strength was 18 kV, and the rotation speed of the roller was 300 rpm. The thickness of the collected spun film was 30 μm. The spun film was cut into strips with a width of 30 cm. Rolling, winding core, slicing method are identical with embodiment 2. The mass percentage of the polymer micro-nano fiber membrane is 30%.
[0041] The lithium metal symmetric battery of this embodiment has a layered, vertically oriented composite lithium negative electrode, and the electrolyte is a commercial lith...
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Abstract
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