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Battery diaphragm with high-temperature-resistant metal-organic frame material coating, and preparation method and application thereof

An organic framework, battery separator technology, applied in the field of electrochemistry, can solve the problems of limiting the working environment and application range of energy storage systems, differential thermal stability and electrolyte wettability, uneven lithium deposition, etc., to suppress adverse side reactions. , The effect of inhibiting the growth of lithium dendrites and increasing the number of ion migration

Active Publication Date: 2019-03-12
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the heterogeneous deposition of lithium on the electrode surface due to the variable pore size of the polyolefin separator results in unfavorable lithium dendrites.
Moreover, polyolefin membranes also have some inherent defects, such as poor thermal stability and electrolyte wettability, which greatly limit the working environment and application range of LIB-based energy storage systems.
In addition, in some new lithium secondary battery systems, such as lithium-sulfur secondary batteries, lithium-oxygen / air secondary batteries, etc., it is difficult for the current commercial separator to avoid some side reactions in the battery

Method used

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  • Battery diaphragm with high-temperature-resistant metal-organic frame material coating, and preparation method and application thereof
  • Battery diaphragm with high-temperature-resistant metal-organic frame material coating, and preparation method and application thereof
  • Battery diaphragm with high-temperature-resistant metal-organic frame material coating, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) 0.875g Cu(NO 3 ) 2 ·3H 2 O and 0.42g C 9 h 6 o 6 Dissolve in 150mL ethanol respectively, after completely dissolving, mix the two and stir for 1 hour to obtain the MOF (HKUST-1) precursor dispersion;

[0034] (2) Suction filter the MOF dispersion obtained in step (1), then wash it with ethanol, and finally place it at 160°C for 12 hours in vacuum to obtain a block-shaped MOF particle sample, and place the block-shaped MOF sample in a mortar Medium, grind for 30min;

[0035] (3) Dissolve 0.1g PVDF in 2mL NMP and stir at 60°C for 12h to prepare PVDF slurry;

[0036] (4) Mix 0.08g of the MOF obtained in step (2) with 0.4g of the PVDF slurry obtained in step (3), then add an appropriate amount (about 0.5mL) of NMP solvent, and grind for 1h;

[0037] (5) the mixed slurry that step (4) gained is coated on aluminum oxide / polyethylene (Al 2 o 3 / PE) membrane surface, first dried in the air for 10min, and then transferred to a vacuum oven at 60°C for 24h to obtain a...

Embodiment 2

[0041] (1) 0.91g Zn(NO 3 ) 2 ·6H 2 O and 0.53g 2-methylimidazole were dissolved in 20mL of methanol respectively, after being completely dissolved, Zn(NO 3 ) 2 ·6H 2 O solution was added in 2-methylimidazole in two times, after stirring for 5min, let it stand for 24h to obtain the MOF (ZIF-8) precursor dispersion;

[0042] (2) Collect the MOF obtained in step (1) by centrifugation at 8000rmp for 10min, then wash with ethanol, and finally place it at 100°C for 12h in vacuum to obtain a block-shaped MOF particle sample, and place the block-shaped MOF sample in a mortar Medium, grind for 30min;

[0043] (3) Dissolve 0.1g PVDF in 2mL NMP and stir at 60°C for 12h to prepare PVDF slurry;

[0044](4) Mix 0.08g of the MOF obtained in step (2) with 0.4g of the PVDF slurry obtained in step (3), then add an appropriate amount (about 0.5mL) of NMP solvent, and grind for 1h;

[0045] (5) Coat the mixed slurry obtained in step (4) evenly on the surface of Celgard 2400, dry it in the ...

Embodiment 3

[0047] (1) Dissolve 0.66g of zinc(II) acetylacetonate and 5.9g of benzimidazole in 100mL of ultrapure water respectively. After they are completely dissolved, mix the two and ultrasonicate for 3 hours at room temperature to obtain MOF (ZIF- 7) Precursor dispersion;

[0048] (2) Suction filter the MOF dispersion obtained in step (1), then wash with ethanol, and finally place it at 100°C for 24 hours in vacuum to obtain a block-like MOF particle sample, and place the block-like MOF sample in a mortar Medium, grind for 30min;

[0049] (3) Dissolve 0.1g PVDF in 2mL NMP and stir at 60°C for 12h to prepare PVDF slurry;

[0050] (4) Mix 0.08g of the MOF obtained in step (2) with 0.4g of the PVDF slurry obtained in step (3), then add an appropriate amount (about 0.5mL) of NMP solvent, and grind for 1h;

[0051] (5) The mixed slurry obtained in step (4) was uniformly coated on the surface of Celgard 2400, dried in air for 10 minutes, and then transferred to a vacuum oven at 60°C for ...

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Abstract

The invention discloses a battery diaphragm with high-temperature-resistant metal-organic frame material coating, and a preparation method and application thereof. The battery diaphragm takes a commercial diaphragm as the substrate, and the single surface or double surface is coated with the metal-organic frame material. Compared with the prior art, the battery diaphragm disclosed by the inventionhas the following advantages: the metal-organic frame material coating is high in porosity and large in specific area, and the electrolyte wetting property of the diaphragm can be improved; the metalorganic frame material coating can effectively improve the heat-insulating property of the diaphragm, and improve the safety performance of the battery in the high-temperature environment; the metal-organic frame material coating can effectively control the shuttle of the electrolyte ion, improve the ion transport number, restrain the bad and side effect, improve the battery capacity, and prolongthe circulating life; the uniform duct structure enables the lithium ions to be uniformly deposited / peeled, thereby fundamentally restraining the growth of the lithium dendrites; the battery diaphragm disclosed by the invention has good flexibility and mechanical performance, and can be used for assembling a practical soft-package battery.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and relates to a functional battery separator, in particular to a battery separator coated with a high-temperature-resistant metal-organic framework material, a preparation method and application thereof. Background technique [0002] Currently, about 80% of the world's energy consumption comes from fossil fuels. The use of fossil fuels has caused a series of serious environmental problems, including global warming, smog and acid rain. Therefore, the development of environmentally friendly, sustainable, safe and reliable energy and its storage technology has become a current research hotspot. [0003] Among various energy storage technologies, secondary batteries, especially lithium secondary batteries (LIBs), have attracted extensive attention due to their cleanliness, safety, and convenience. The production of lithium batteries stems from the discovery and application of lithium meta...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14H01M10/052H01M10/0525H01M12/06H01M12/08H01M50/403H01M50/409H01M50/417H01M50/431H01M50/44H01M50/449H01M50/451
CPCH01M10/052H01M10/0525H01M12/06H01M12/08H01M50/403H01M50/411H01M50/449Y02E60/10
Inventor 周豪慎贺亦柏常智王鹏飞何平
Owner NANJING UNIV
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