A preparation method of a bifunctional composite separator for lithium-sulfur batteries
A composite diaphragm, lithium-sulfur battery technology, used in secondary batteries, battery pack parts, circuits, etc., can solve the problem of not being able to improve the flame retardant performance, achieve good chemical adsorption, and enhance electrochemical performance. , the effect of high circulation and safety
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[0032] The preparation method of the bifunctional composite membrane provided by the invention comprises the following steps:
[0033] (1) Reaction of diamine and dianhydride in equimolar amounts to generate polyamic acid, which is used as spinning solution to spin and form a film; specifically include:
[0034] (1.1) Add the diamine into the solvent, stir in a cold trap at -4°C under the protection of nitrogen until it dissolves; then add the dianhydride into the diamine solution in four times; after reacting for 24 hours, a polyamic acid solution is obtained;
[0035] The solvent is N,N-dimethylformamide (DMF) or N,N-dimethylacetamide (DMAc) or N-methylpyrrolidone (NMP).
[0036] (1.2) The polyamic acid solution is subjected to electrospinning, the electrospinning temperature is 32°C, the spinning voltage is 17KV, the distance between the spinning needle and the receiver is 20cm, and the spinning is 2h to obtain polyamic acid spinning membrane;
[0037] The diamine is any ...
Embodiment 1
[0046] Molybdenum oxide (MoO 3 ) and carboxylated carbon nanotubes as the preparation of the modified layer of the diaphragm and complete the preparation of lithium-sulfur battery examples.
[0047] Preparation of diaphragm: Weigh 2.0024g of 4,4'-diaminodiphenyl ether, dissolve 4,4'-diaminodiphenyl ether in 40mL DMF in a cold trap at -4°C under nitrogen atmosphere, and equimolar A certain amount of pyromellitic dianhydride was added to the solution four times every half hour. Specifically, 0.7271g was added for the first and second times, 0.3635g was added for the third and fourth times, and reacted for 24 hours to obtain polyamic acid solution. Then the polyamic acid solution was subjected to electrospinning, the electrospinning temperature was 32° C., the spinning voltage was 17 KV, the distance between the spinning needle and the receiver was 20 cm, and the spinning was performed for 2 hours to obtain a polyamic acid spun film. Its thickness is between 40 and 55 μm. Mix ...
Embodiment 2
[0056] The preparation of a separator with molybdenum oxide (MoO3) and Super-P as a modified layer and the preparation of a lithium-sulfur battery.
[0057] Preparation of diaphragm: Weigh 2.0024g of 4,4'-diaminodiphenyl ether, dissolve 4,4'-diaminodiphenyl ether in 40mL DMF in a cold trap at -4°C under nitrogen atmosphere, and equimolar A certain amount of 3,3',4,4'-biphenyltetracarboxylic dianhydride was added into the solution four times every half hour, specifically, 0.9807g was added for the first and second times, and 0.9807g was added for the third and fourth times respectively. Add 0.4904g and react for 24 hours to obtain a polyamic acid solution, then electrospin the polyamic acid solution, the electrospinning temperature is 32°C, the spinning voltage is 17KV, and the distance between the spinning needle and the receiver is 20cm , and spinning for 2 hours to obtain a polyamic acid spun membrane with a thickness of 55-70 μm. molybdenum oxide (MoO 3 ) and Super-P in a...
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