Preparation method of diaphragm material of lithium-sulfur battery

A diaphragm material and lithium-sulfur battery technology, applied in the field of material chemistry, can solve the problems of easy pulverization of the electrode, reduction of the utilization rate of the active material of the sulfur electrode, and complex experiments

Active Publication Date: 2019-03-22
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The shuttle effect reduces the utilization of sulfur electrode active materials
At the same time due to Li 2 S and Li 2 S 2 It cannot be dissolved in the electrolyte and deposited on the surface of the anode, which further reduces the performance of the lithium-sulfur battery
Due to sulfur and the final product Li 2 The density of S is different, and the sulfur cathode will undergo a large volume change before and after the electrode reaction, so the electrode is easily pulverized during multiple cycles, resulting in damage to the battery
[0004] In order to solve the appeal problem, it has been proved that the m

Method used

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  • Preparation method of diaphragm material of lithium-sulfur battery

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Experimental program
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Effect test

Embodiment 1

[0031] Step 1: Synthesis of ZIF8 powder:

[0032] Disperse 5 mmol of zinc nitrate hexahydrate in 125 ml of methanol to obtain solution A, disperse 20 mmol of 2-methylimidazole in 125 ml of methanol to obtain solution B, add solution B to solution A under continuous magnetic stirring, and stir for 3 Minutes until uniform; seal and leave to age for 24 hours; centrifuge, wash the isolated product, wash with methanol for 3 times, then wash with ethanol for 3 times, and dry at 60°C overnight to obtain ZIF8 powder.

[0033] Step 2: Preparation of ZIF8 / CNT composite fiber filaments by electrospinning:

[0034] Add 1 g of the ZIF8 powder obtained in step 1, 1 g of polyacrylonitrile (PAN), and 1 g of carbon nanotubes (CNT) to 20 mL of dimethylformamide (DMF) to form a solution, and use electrospinning to prepare ZIF8 / CNT composite fiber; the voltage of the electrospinning is 5kv, and the feed rate is 1.0 mL / h.

[0035] Step 3: Carbonization

[0036] Put 1 g of the composite fiber y...

Embodiment 2

[0041] Step 1: Synthesis of ZIF8 powder:

[0042]Disperse 7 mmol of zinc nitrate hexahydrate in 180 ml of methanol to obtain solution A, disperse 30 mmol of 2-methylimidazole in 180 ml of methanol to obtain solution B, add solution B to solution A under continuous magnetic stirring, and stir for 4 Minutes until uniform; seal and leave to age for 24 hours; centrifuge, wash the isolated product, wash with methanol for 3 times, then wash with ethanol for 3 times, and dry at 70°C overnight to obtain ZIF8 powder.

[0043] Step 2: Preparation of ZIF8 / CNT composite fiber by electrospinning:

[0044] Add 1.5g of ZIF8 powder obtained in step 1, 1.5g of polyacrylonitrile (PAN) and 1.5g of carbon nanotubes (CNT) to 30mL of dimethylformamide (DMF) to form a solution, which is prepared by electrospinning The ZIF8 / CNT composite fiber was obtained; the electrospinning voltage was 6.5kv, and the feed rate was 1.0 mL / h.

[0045] Step 3: Carbonization

[0046] Place 1 g of the composite fibe...

Embodiment 3

[0051] Step 1: Synthesis of ZIF8 powder:

[0052] Disperse 10mmol of zinc nitrate hexahydrate in 250ml of methanol to obtain solution A, disperse 40 mmol of 2-methylimidazole in 250ml of methanol to obtain solution B, add solution B to solution A under continuous magnetic stirring, and stir for 5 Minutes until uniform; seal and let stand for aging for 24 hours; centrifuge, wash the isolated product, wash with methanol for 3 times, then wash with ethanol for 3 times, and dry at 80°C overnight to obtain ZIF8 powder.

[0053] Step 2: Preparation of ZIF8 / CNT composite fiber by electrospinning:

[0054] Add 2 g of the ZIF8 powder obtained in step 1, 2 g of polyacrylonitrile (PAN), and 2 g of carbon nanotubes (CNT) to 35 mL to form a solution, and obtain ZIF8 / CNT composite fibers by electrospinning; the electrospinning The voltage is 8kv, and the feed rate is 1.0mL / h.

[0055] Step 3: Carbonization

[0056] Place 2 g of the composite fiber filaments obtained in step 2 in a tube f...

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Abstract

The invention relates to a diaphragm material of a lithium-sulfur battery, in particular to a metal organic framework material and a preparation method thereof. The preparation method comprises the following steps of S1, preparing a ZIF-8 (zeolite imidazolate framework-8) nanopowder; S2, preparing ZIF8/CNT (carbon nanotube) composite fiber wires by electrostatic spinning; S3, carbonizing, so as toobtain the hollow porous ZIF8@CNTs; mixing the hollow porous ZIF8@CNTs, conductive carbon black and PVDF in a NMP solution, grinding, applying onto a clean diaphragm, and drying, so as to obtain themodified diaphragm of the lithium-sulfur battery. The diaphragm material has the advantages that the property of the diaphragm material is improved; the defects of obvious shuttle effect of polysulfides in the lithium-sulfur battery prepared by the prior art, obvious volume expansion effect of the lithium-sulfur battery, instability in the electrochemical property of the battery and the like are overcome; the production technology is simplified, and the production cost is reduced.

Description

technical field [0001] The invention relates to a preparation method of a diaphragm material for a lithium-sulfur battery, and more particularly relates to a preparation method of a metal-organic framework material as a diaphragm material, belonging to the field of material chemistry. Background technique [0002] With the progress and development of social productivity, energy has become one of the key factors affecting social development. Due to the non-renewability of traditional fossil fuels (coal, petroleum) and their unfriendliness to the environment (such as the greenhouse effect, acid rain, etc.), it is imminent to develop a renewable green energy system. At present, new green energy systems such as wind energy, solar energy, and tidal energy have been widely used, partially alleviating the human energy crisis. The application of the above-mentioned new green energy system inevitably involves the issue of energy storage, that is, a large-capacity and more flexible a...

Claims

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Application Information

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IPC IPC(8): D01F9/10H01M2/14H01M2/16H01M50/403H01M50/44H01M50/491
CPCD01F9/10H01M50/431H01M50/44H01M50/403Y02E60/10
Inventor 张永光张俊凡
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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