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Multifunctional lithium-sulfur battery diaphragm and preparation method thereof

A lithium-sulfur battery and separator technology, applied in the field of energy materials, can solve the problem of single graphene coating with single function, and achieve the effects of reducing the possibility of passing through the separator, improving heat resistance, and increasing contact space.

Active Publication Date: 2018-04-06
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

[0006] The present invention aims at the defect that background technology exists, proposes a kind of preparation method of the composite material that is used for lithium-sulfur battery membrane coating, and sodium lignosulfonate (SL) is compounded with reduced graphene oxide (rGO), solves the problem of The technical problem of single function of simple graphene coating is solved, and the obtained composite material is coated on the separator of lithium-sulfur battery, which can effectively inhibit the shuttle effect in the battery and improve the performance of the battery

Method used

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  • Multifunctional lithium-sulfur battery diaphragm and preparation method thereof
  • Multifunctional lithium-sulfur battery diaphragm and preparation method thereof
  • Multifunctional lithium-sulfur battery diaphragm and preparation method thereof

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preparation example Construction

[0030] A preparation method for a composite material for lithium-sulfur battery diaphragm coating, comprising the following steps:

[0031] Step 1: Disperse 100-200mg of graphene oxide (GO) in 100mL of dimethylformamide (DMF), and sonicate for 10-30min to obtain a graphene dispersion with a uniform concentration of 1-2mg / mL;

[0032] Step 2: Add 300-500 μL of hexamethylene diisocyanate (HDI) into 100 mL of dimethylformamide (DMF), mix well, condense the obtained mixture in an oil bath and heat it to 140-150°C, and keep it warm for 5 minutes; Wherein, the concentration of hexamethylene diisocyanate in the mixed solution is 3-5 μL / mL; during this process, graphene oxide (GO) is reduced to reduced graphene oxide (rGO);

[0033] Step 3: Slowly add the graphene dispersion obtained in step 1 to the mixed solution treated in step 2 at a rate of 10-20 mL / min, stir and mix evenly, and heat in an oil bath at 140-150°C for 30 minutes to obtain a mixed solution A;

[0034] Step 4: Add 2...

Embodiment

[0042] A preparation method of a lithium-sulfur battery separator, specifically comprising the following steps:

[0043] Step 1. After cleaning 30g of water-removing molecular sieves ultrasonically for 5 times with alcohol, bake them in an oven at 100°C for 24 hours to completely remove the moisture in the molecular sieves;

[0044] Step 2. Put the molecular sieve after dehydration in step 1 into 800mL dimethylformamide (DMF), remove the moisture in the DMF, and obtain the DMF after dehydration; when taking the dehydration DMF, use a pipette to absorb The upper liquid, the DMF solution in the follow-up steps is dehydrated DMF;

[0045] Step 3. Slowly add 100 mg of graphene oxide (GO) into 100 mL of dimethylformamide (DMF), and sonicate for 30 minutes to obtain a uniform graphene oxide dispersion;

[0046] Step 4. Add 350 μL of hexamethylene diisocyanate (HDI) into 100 mL of dimethylformamide (DMF), mix well, and condense the obtained mixture in an oil bath to 140° C., and kee...

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Abstract

The invention relates to a multifunctional lithium-sulfur battery diaphragm and a preparation method thereof, belonging to the technical field of energy materials. The lithium-sulfur battery diaphragmsolves the technical problem that a pure graphene coating is single in function by taking a composite material compounded by sodium lignin sulfonate and reduced graphene oxide as a coating. The obtained composite material coated to the lithium-sulfur battery diaphragm will form an electriferous region under the ionizing action, so that one side of the diaphragm is with negative electricity. According to the principle of homopolar repulsion, the diaphragm with negative electricity will obviously repel polysulfide with negative electricity, so that the probability that polysulfide passes through the diaphragm is reduced effectively, the shuttling effect is reduced, and the battery performance is improved.

Description

technical field [0001] The invention belongs to the technical field of energy materials, and in particular relates to a separator for a high-performance lithium-sulfur battery and a preparation method thereof. Background technique [0002] New energy vehicles are an important measure to alleviate my country's energy pressure, respond to climate change, and promote the sustainable development of the automobile industry and transportation industry. In recent years, my country's dependence on foreign oil consumption has reached 60.6%. Energy security, especially the security of oil and gas resources, has become an important factor restricting economic development. Vigorously developing renewable resources is the only way to realize the transformation of the automobile industry. The strategic choice of my country's energy security. However, renewable resources are uncontrollable and unstable, requiring the use of reliable energy storage batteries. As a commonly used energy stor...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/052H01M50/403H01M50/446H01M50/451
CPCH01M10/052H01M50/431H01M50/403H01M50/449H01M50/411Y02E60/10
Inventor 熊杰雷天宇陈伟邬春阳戴丽萍
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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