Composite diaphragm as well as preparation method and application thereof
A composite diaphragm and film technology, applied in the direction of final product manufacturing, sustainable manufacturing/processing, structural parts, etc., can solve the problems of reduced active material content, unfavorable battery energy density, unfavorable large-scale production, etc., to improve adhesion , It is beneficial to battery forming and reduces the effect of low dew point requirements
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Embodiment 1
[0034] The present embodiment provides a preparation method of a composite diaphragm, the preparation method comprising:
[0035] (1) Mix and heat the fluoropolymer, adsorbent material and hydrophobic monomer to obtain mixed pellets; (2) Roll the mixed pellets into a film after multiple laminations; (3) Combine the film with the initiator The composite membrane is obtained by mixing the extractant with the solvent, extracting pores, and baking at high temperature.
[0036] The fluoropolymer contains fluorocarbon chains; preferably, the repeating structural units in the fluoropolymer contain fluorocarbon chains.
[0037] The repeating structural unit is a compound of C2-C10; preferably a compound of C2-C6.
[0038] In the repeating structural unit, there is at least one fluorine atom and carbon atom to form a fluorocarbon chain.
[0039] The fluoropolymer includes at least one of polyvinylidene fluoride, polytetrafluoroethylene, polyvinylidene fluoride-hexafluoropropylene, an...
Embodiment 2
[0082] This embodiment provides a composite diaphragm, and the preparation method of the composite diaphragm is the same as that of the composite diaphragm in Embodiment 1, and details are not described here.
[0083] The thickness of the composite diaphragm is 6-40 μm, which can be 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm or any two values.
[0084] The porosity of the composite diaphragm is 10~65%, which can be 10%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60% or any two values between Any value; preferably 20% to 50%.
[0085] The surface of the composite diaphragm contains a hydrophobic layer, and the thickness of the hydrophobic layer is less than 0.5 μm, so it is difficult to detect when the thickness of the diaphragm is detected later; the thin hydrophobic layer can protect the composite diaphragm from water and air. Interference, and can be dissolved in the subsequent application of the battery, thereby exposing the adsorbent material a...
Embodiment 3
[0088] This embodiment provides a battery comprising the composite separator obtained by the preparation method of Embodiment 1 and / or the separator of Embodiment 2.
[0089] The battery is a lithium ion battery or a lithium metal battery.
[0090] The battery also includes a positive electrode sheet, a negative electrode sheet and an electrolyte.
[0091] How to make the battery:
[0092] The positive electrode sheet, the negative electrode sheet and the separator are prepared into the desired type of battery by stacking, and then the lithium ion / lithium metal battery is made by entering the shell, vacuum drying, injecting electrolyte, forming and dividing.
[0093] Since the surface of the diaphragm has a hydrophobic protective layer, there is no need to perform a strict external water removal step before the composite diaphragm is used, including when assembling the battery. Since the hydrophobic coating is very thin and has a certain solubility in carbonate and ether ele...
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Abstract
Description
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