Diaphragm intermediate layer material of lithium-sulfur battery as well as preparation method and application of material
A lithium-sulfur battery and interlayer technology, applied in the field of materials, can solve the problems of active material loss and electrochemical performance degradation, and achieve the effects of accelerated decomposition, lower charging barrier, and simple equipment
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[0045] The separator intermediate layer material of the above lithium-sulfur battery can be obtained by the following preparation method. The specific method steps are as figure 1 As shown, the preparation process is as follows figure 2 shown, combined with figure 1 , figure 2 , its preparation method comprises:
[0046] Step 110, mixing the graphene and the binder in proportion, adding an appropriate amount of solvent after mixing evenly, and stirring for 6-12 hours to obtain a mixed slurry;
[0047] Specifically, the method for obtaining graphene includes one or more of graphene obtained by mechanical exfoliation method, vapor deposition method, redox method, and intercalation method;
[0048] The binder includes one or more of polyvinylidene fluoride, polytetrafluoroethylene, polyvinyl alcohol, sodium carboxymethyl cellulose and polyurethane;
[0049] The mixing ratio of graphene and binder is 2:1-5:1 by mass ratio, preferably 2:1, 3:1, 4:1 or 5:1, and use 3-5 drops ...
Embodiment 1
[0061] This embodiment provides a preparation method and performance of a diaphragm interlayer material and a lithium-sulfur battery having the diaphragm interlayer material. Proceed as follows:
[0062] 1. Weigh 300mg of graphene and 100mg of polyvinylidene fluoride, mix and grind for half an hour, use weighing paper to transfer to a 100ml glass bottle, add N-methylpyrrolidone drop by drop until the slurry has a certain fluidity, and then add the rotor , stirred with a magnetic stirrer for 8 hours to make the slurry evenly mixed.
[0063] 2. Use ethanol to moderately wipe the PP diaphragm base film (Celgard2400 diaphragm), fix the wiped clean diaphragm base film on a clean glass plate, and then evenly mix the uniform slurry on the diaphragm base film, The thickness of the scraping coating is 60 μm. After coating, put the glass plate into a blast drying oven, adjust the temperature to 60°C, and dry for 8 hours. After drying, a separator (PP-Gns) coated with slurry is obtained...
Embodiment 2
[0075] This embodiment provides a preparation method and performance of a diaphragm interlayer material and a lithium-sulfur battery having the diaphragm interlayer material. Proceed as follows:
[0076]1. Weigh 300mg of graphene and 100mg of polyvinylidene fluoride, mix and grind for half an hour, use weighing paper to transfer to a 100ml glass bottle, add N-methylpyrrolidone drop by drop until the slurry has a certain fluidity, add the rotor, and use magnetic force Mix in a blender for 8 hours until well blended.
[0077] 2. Use ethanol to moderately wipe the PP diaphragm base film (Celgard2400 diaphragm), fix the wiped clean diaphragm base film on a clean glass plate, and then evenly mix the uniform slurry on the diaphragm base film, The thickness of the blade coating is 60 μm. After coating, put the glass plate into a blast drying oven, adjust the temperature to 60° C., and dry it for 8 hours. After drying, the slurry-coated separator (PP-Gns) was obtained, and the coati...
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