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Cyclodextrin/graphite carbon modified lithium-sulfur battery diaphragm as well as preparation method and application thereof

A lithium-sulfur battery and battery separator technology, applied in the field of cyclodextrin/graphite carbon modified lithium-sulfur battery separator and its preparation, can solve the problem that physical adsorption and electrostatic repulsion cannot effectively solve the problem of polysulfide shuttle, cannot It can effectively adsorb polysulfides, and it is difficult to meet the long cycle of batteries, so as to inhibit the shuttle effect, promote rapid transfer, and reduce the growth of lithium dendrites.

Pending Publication Date: 2021-08-17
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The physical adsorption method mainly uses the van der Waals force between porous, high specific surface area carbon materials and lithium polysulfide to inhibit the shuttle action. Since the van der Waals force is relatively small, polysulfides cannot be effectively adsorbed, so it is difficult to meet the long cycle requirements of the battery.
Electrostatic repulsion mainly uses negatively charged sulfonic acid groups, carboxyl groups, etc. to repel polysulfide anions to limit them to the positive electrode area. However, due to the limited number of nega

Method used

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  • Cyclodextrin/graphite carbon modified lithium-sulfur battery diaphragm as well as preparation method and application thereof
  • Cyclodextrin/graphite carbon modified lithium-sulfur battery diaphragm as well as preparation method and application thereof
  • Cyclodextrin/graphite carbon modified lithium-sulfur battery diaphragm as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A cyclodextrin / graphite carbon modified lithium-sulfur battery diaphragm, the preparation method of which comprises the following steps:

[0040] The first step: electrospinning technology to prepare the basic separator:

[0041] Weigh acetone and N,N-dimethylacetamide at a mass ratio of 1:1 to obtain a mixed solution, weigh cellulose diacetate and dissolve it in a mixed solution of acetone and N,N-dimethylacetamide to obtain the mass The cellulose diacetate with a concentration of 15% was stirred at a speed of 150 r / min for 48 hours to obtain a transparent spinning solution, which was left to defoam for 2 hours, and then the spinning solution was placed in a syringe and loaded on a syringe pump for spinning for 30 hours. The spinning process parameters were set as spinning voltage 16KV, receiving distance 15cm, advancing speed 1.0mL / h, and after continuous spinning for 30 hours, a basic separator with a fiber diameter of 180nm and a thickness of 20μm was obtained.

[...

Embodiment 2

[0047] A cyclodextrin / graphite carbon modified lithium-sulfur battery diaphragm, the preparation method of which comprises the following steps:

[0048] The first step: electrospinning technology to prepare the basic separator:

[0049] Weigh acetone and N,N-dimethylacetamide at a mass ratio of 1.5:1 to obtain a mixed solution, weigh cellulose acetate and dissolve it in a mixed solution of acetone and N,N-dimethylacetamide to obtain the mass The cellulose acetate with a concentration of 13% was stirred at a speed of 120 r / min for 36 hours to obtain a transparent spinning solution, which was left to defoam for 1 hour, and then the spinning solution was placed in a syringe and loaded on a syringe pump for spinning for 24 hours. The spinning process parameters were set as spinning voltage 14KV, receiving distance 10cm, and advancing speed 0.8mL / h. After continuous spinning for 24 hours, a basic membrane with a fiber diameter of 240nm and a thickness of 18μm was obtained.

[0050...

Embodiment 3

[0055] A cyclodextrin / graphite carbon modified lithium-sulfur battery diaphragm, the preparation method of which comprises the following steps:

[0056] The first step: electrospinning technology to prepare the basic separator:

[0057] Weigh acetone and N,N-dimethylacetamide at a mass ratio of 2:1 to obtain a mixed solution, weigh triacetate cellulose and dissolve it in a mixed solution of acetone and N,N-dimethylacetamide to obtain the mass Concentration of 12% cellulose acetate, stirred at a speed of 135r / min for 42 hours to obtain a transparent spinning solution, left to defoam for 1.5 hours, and then placed the spinning solution in a syringe and loaded it on a syringe pump for spinning for 36 hours . The spinning process parameters were set as spinning voltage 18KV, receiving distance 20cm, advancing speed 1.2mL / h, and after continuous spinning for 36 hours, a basic separator with a fiber diameter of 200nm and a thickness of 22μm was obtained.

[0058] The second step: ...

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Abstract

The invention discloses a cyclodextrin/graphite carbon modified lithium-sulfur battery diaphragm as well as a preparation method and application thereof. The modified lithium-sulfur battery diaphragm comprises a basic diaphragm and a modified functional layer, the basic diaphragm is a nanofiber membrane; and the modified functional layer comprises a cyclodextrin layer and a graphite carbon layer which are respectively arranged on two sides of the basic diaphragm. The lithium-sulfur battery assembled by adopting the cyclodextrin/graphite carbon modified lithium-sulfur battery diaphragm prepared by the invention has high ionic conductivity of 1.3-1.8 mS/cm and low interface impedance of 60-70 omega; and under the current density of 0.2 C, the first specific discharge capacity reaches up to 1300mAh/g or above.

Description

technical field [0001] The invention relates to the field of material chemistry, in particular to a cyclodextrin / graphite carbon modified lithium-sulfur battery diaphragm, a preparation method and application thereof. Background technique [0002] With the continuous miniaturization of electronic equipment and the rapid development of mobile communication equipment, portable electronic information products, electric vehicles, and energy storage power stations, traditional transition metal oxides such as lithium cobalt oxide (LiCoO 2 ), lithium manganate (LiMn 2 o 4 ) and lithium nickelate (LiNiO 2 ) as the positive electrode material of lithium-ion batteries can no longer meet the needs of overall development, especially the requirements of high specific capacity and high energy density. The theoretical specific capacity of lithium-sulfur batteries is equivalent to about 5 times that of lithium-ion batteries, making them candidates for next-generation high-energy-density ...

Claims

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Application Information

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IPC IPC(8): H01M50/44H01M50/414H01M50/431H01M50/457H01M50/403H01M10/058H01M10/052H01M10/42B82Y30/00B82Y40/00
CPCH01M10/058H01M10/052H01M10/4235B82Y30/00B82Y40/00Y02P70/50Y02E60/10
Inventor 黄锋林史佳倚武双林姚莹梅徐文晴魏取福
Owner JIANGNAN UNIV
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