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Flexible metal organic framework-based plastic crystal electrolyte as well as preparation method and application thereof

A metal-organic framework and organic framework technology, applied in the manufacture of electrolyte batteries, composite electrolytes, non-aqueous electrolyte batteries, etc., can solve the problems of uneven distribution of MOF particles, low lithium ion migration number, large interfacial gap, etc., and achieve good flexibility , Promote uniform distribution and avoid the effect of large interfacial gaps

Active Publication Date: 2021-09-17
ZHONGYUAN ENGINEERING COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, MOF electrolytes composited with ionic liquids tend to exhibit lower lithium ion transport numbers
In addition, the patent CN 102738510 A forms a composite electrolyte with MOF materials, polymers, and lithium salts to improve the ionic conductivity and flexibility of the electrolyte, but this patent does not solve the problems of uneven distribution of MOF particles and large interfacial gaps, resulting in Uncontrolled lithium ion transport channels

Method used

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  • Flexible metal organic framework-based plastic crystal electrolyte as well as preparation method and application thereof
  • Flexible metal organic framework-based plastic crystal electrolyte as well as preparation method and application thereof
  • Flexible metal organic framework-based plastic crystal electrolyte as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The preparation method of the flexible metal-organic framework-based plastic crystal electrolyte in this embodiment, the steps are as follows:

[0034] (1) Preparation of metal-organic framework (MOF) film: Zn(NO 3 ) 2 .6H 2 O and 2-methylimidazole were added to 100 mL of methanol, and after fully dissolved, the methanol solution containing 2-methylimidazole was slowly dropped into the solution containing Zn(NO 3 ) 2 .6H 2 O in methanol solution, stirred thoroughly for 2 hours. Then stand at room temperature for 24 hours, then centrifuge at 8000 rpm, and wash thoroughly with methanol solution three times. Then the above-mentioned substances were placed in a vacuum drying oven at 60° C., and were taken out for grinding after 12 hours. The above metal organic framework material and PTFE were fully mixed at a molar ratio of 9:1, and then a MOF film with a thickness of 100 μm was made by rolling method, and punched into a disc with a diameter of 16 mm.

[0035] (2) P...

Embodiment 2

[0041] The preparation method of the flexible metal-organic framework-based plastic crystal electrolyte in this example is the same as in Example 1, except that step (1) is changed to: prepare MOF film: Co(NO 3 ) 2 .6H 2 O and 2-methylimidazole were added to 100 mL of methanol, and after fully dissolved, the methanol solution containing 2-methylimidazole was slowly dropped into the solution containing Zn(NO 3 ) 2 .6H 2 O in methanol solution, stirred thoroughly for 2 hours. Then stand at room temperature for 24 hours, then centrifuge at 8000 rpm, and wash thoroughly with methanol solution three times. Then the above-mentioned substances were placed in a vacuum drying oven at 60° C., and were taken out for grinding after 12 hours. The above metal organic framework material and PTFE were fully mixed at a molar ratio of 9:1, and then a film with a thickness of 100 μm was made by rolling method, and punched into a disc with a diameter of 16 mm.

Embodiment 3

[0043] The preparation method of the flexible metal-organic framework-based plastic crystal electrolyte in this embodiment, the steps are as follows:

[0044] (1) Preparation of MOF membrane: Zn(NO 3 ) 2 .6H 2 O and 2-methylimidazole were added to 100 mL of methanol, and after fully dissolved, the methanol solution containing 2-methylimidazole was slowly dropped into the solution containing Zn(NO 3 ) 2 .6H 2 O in methanol solution, stirred thoroughly for 2 hours. Then stand at room temperature for 24 hours, then centrifuge at 8000 rpm, and wash thoroughly with methanol solution three times. Then the above-mentioned substances were placed in a vacuum drying oven at 60° C., and were taken out for grinding after 12 hours. The above metal organic framework material and PTFE were fully mixed at a molar ratio of 9:1, and then a MOF film with a thickness of 50 μm was made by rolling method, and punched into a disc with a diameter of 16 mm.

[0045] (2) Preparation of plastic c...

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Abstract

The invention belongs to the field of lithium metal batteries, and relates to a flexible metal organic framework-based plastic crystal electrolyte as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly, rolling a metal organic framework material into a film with a certain thickness, and then immersing the film into the plastic crystal electrolyte at a certain temperature for several hours to obtain the metal organic framework-based plastic crystal electrolyte. The metal organic framework material has a proper porous structure, and only allows small-size lithium ions to pass through internal pore channels, so that uniform transmission of the lithium ions is regulated and controlled. The plastic crystal electrolyte can quickly conduct lithium ions and has high ionic conductivity. Meanwhile, the film prepared by the rolling method has good flexibility. Therefore, the prepared metal organic framework-based plastic crystal electrolyte has the advantages of the metal organic framework material and the plastic crystal electrolyte, not only has relatively high ionic conductivity, but also has flexibility, and can well regulate and control uniform deposition of lithium ions.

Description

technical field [0001] The invention belongs to the field of lithium metal batteries, and relates to a flexible metal-organic framework-based plastic crystal electrolyte and a preparation method and application thereof. Background technique [0002] With the rapid development of portable electronic devices and electric vehicles, the development of high-performance energy storage devices has become a common choice for the world to deal with energy and environmental issues. Lithium metal batteries have the highest energy density among secondary batteries and thus become a current research hotspot. However, currently reported lithium metal batteries usually use organic electrolytes, and the flammability and fluidity of such liquid electrolytes seriously endanger the safety of batteries. Compared with liquid electrolytes, solid electrolytes can effectively avoid problems such as liquid leakage and internal short circuits in batteries, and are a highly safe electrolyte system. ...

Claims

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Application Information

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IPC IPC(8): H01M10/058H01M10/0565H01M10/0525
CPCH01M10/058H01M10/0565H01M10/0525H01M2300/0088Y02P70/50
Inventor 韩点点米立伟王鹏飞张明磊韩尚峰刘静陈鹏静李善卿王秋实
Owner ZHONGYUAN ENGINEERING COLLEGE
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