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Metal-organic frame material based composite battery diaphragm and preparation method and application thereof

An organic framework and composite battery technology, applied in the field of electrochemistry, can solve the problems of uncontrollable growth of dendrites, random diffusion of ions, etc., and achieve the effects of inhibiting the growth of dendrites, increasing the number of ion migration, and increasing battery capacity.

Inactive Publication Date: 2018-11-13
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the electrolyte wettability and mechanical strength of most new separators have been improved, a series of problems caused by the uncontrollable growth of dendrites and the random diffusion of ions in the electrolyte need to be further solved. Li / Na secondary batteries The practical application still faces great challenges

Method used

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  • Metal-organic frame material based composite battery diaphragm and preparation method and application thereof
  • Metal-organic frame material based composite battery diaphragm and preparation method and application thereof
  • Metal-organic frame material based composite battery diaphragm and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (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 precursor dispersion;

[0027] (2) Add 10 mg GO to 100 mL deionized water, stir for 1 h, and then sonicate for 5 h to obtain a GO suspension;

[0028] (3) Take 5 mL of the GO dispersion obtained in step (2) and add it to a vacuum filter bottle for suction filtration;

[0029] (4) After the GO suspension in (3) is drained, add 20 mL of the MOF precursor dispersion prepared in step (1) and continue the suction filtration;

[0030] (5) alternately repeat steps (2) and (3) 3 times;

[0031] (6) After adding 20 mL of ethanol for suction filtration and cleaning, the obtained film was peeled off from the suction filtration membrane, and then dried in a vacuum oven at 60°C for 24 hours to finally obtain the MOF@GO composite film, and its field emission scanning electron microscope The result is as fi...

Embodiment 2

[0033] (1) 1.31g Cu(NO 3 ) 2 ·3H 2 O and 0.63g C 9 h 6 o 6 Dissolve in 200mL ethanol respectively, after completely dissolving, mix the two and stir for 1 hour to obtain the MOF precursor dispersion;

[0034] (2) Add 15 mg GO to 100 mL deionized water, stir for 1 h, and then sonicate for 5 h to obtain a GO suspension;

[0035] (3) Take 5 mL of the GO dispersion obtained in step (2) and add it to a vacuum filter bottle for suction filtration;

[0036] (4) After the GO suspension in (3) is drained, add 30 mL of the MOF precursor dispersion prepared in step (1) and continue the suction filtration;

[0037] (5) alternately repeat steps (2) and (3) 3 times;

[0038] (6) After adding 20 mL of ethanol for suction filtration and cleaning, the obtained film was peeled off from the suction filtration membrane, and then dried in a vacuum oven at 60°C for 24 hours to finally obtain a MOF@GO composite film.

Embodiment 3

[0040] (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 precursor dispersion;

[0041] (2) Add 1g of PVDF-HFP to 20mL of acetone, stir at 60°C for 5h to obtain a PVDF-HFP solution;

[0042] (3) Get 30mL of the obtained MOF precursor dispersion in step (1) and add it to a vacuum filter bottle for suction filtration;

[0043] (4) After the MOF precursor dispersion in (3) is drained, add 0.5mL of the PVDF-HFP solution prepared in step (2) and continue the suction filtration;

[0044] (5) After repeating steps (3) and (4) twice alternately, add 20 mL of ethanol for suction filtration and washing, and then remove the obtained film from the suction filtration membrane and place it in a vacuum oven at 60°C for 24 hours to dry to obtain MOF@PVDF-HFP composite film, the field emission scanning electron microscopy results are as follows figure 2 shown.

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Abstract

The invention discloses a metal-organic frame material based composite battery diaphragm and a preparation method and application thereof. The preparation method comprises the following steps: (1), synthesizing a metal-organic frame material precursor; (2), compounding the metal-organic frame material precursor and a two-dimensional material or a polymer material to obtain the metal-organic framematerial based composite battery diaphragm. The diaphragm is high in porosity and large in specific surface area, the electrolyte wettability of the diaphragm can be improved, and the ion transport number of the diaphragm is greatly increased; the diaphragm has the advantage of an adjustable pore size, and through a suitable pore size, shuttling of electrolyte ions can be effectively controlled, occurrence of adverse side reactions can be inhibited, the battery capacity can be increased and the cycle life can be prolonged; through a uniform pore structure, the passing ions can be uniformly dispersed on the surface of an electrode, so that growth of dendrites are fundamentally inhibited, the cycle life of a battery is effectively prolonged, and the safety performance of the battery is improved; the metal-organic frame material based composite battery diaphragm has good flexibility and mechanical properties and can be applied to assembly of a practical soft pack battery.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and relates to a lithium negative electrode protective diaphragm, in particular to a composite battery diaphragm based on a metal-organic framework material and a preparation method and application thereof. Background technique [0002] With the rapid development of the global economy, the consumption of fossil fuels such as coal, oil and natural gas as the main energy sources has also increased sharply, resulting in the depletion of non-renewable energy sources and the increasing environmental pollution. Protecting natural resources and the environment and developing renewable clean energy have become the top priority for realizing sustainable development of human beings. Among the rapidly emerging new energy technologies, lithium / sodium secondary batteries have attracted more and more attention because of their advantages such as high specific energy, low cost, and environmental friend...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/05H01M12/08
CPCH01M10/05H01M12/08H01M50/409H01M50/403Y02E60/10
Inventor 周豪慎贺亦柏常智柏松延何平
Owner NANJING UNIV
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