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Double-coating diaphragm capable of simultaneously inhibiting lithium dendrites and shuttle effect and preparation method thereof

A shuttle effect, double-coating technology, applied in lithium batteries, structural parts, electrical components, etc., to achieve the effect of inhibiting lithium dendrites

Active Publication Date: 2020-09-18
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, so far, only one of the problems reported in the literature or inventions has been considered, and the construction of multifunctional diaphragm coatings that can solve these two bottleneck problems is still rarely reported.

Method used

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  • Double-coating diaphragm capable of simultaneously inhibiting lithium dendrites and shuttle effect and preparation method thereof
  • Double-coating diaphragm capable of simultaneously inhibiting lithium dendrites and shuttle effect and preparation method thereof
  • Double-coating diaphragm capable of simultaneously inhibiting lithium dendrites and shuttle effect and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Preparation of a dual-coated separator that simultaneously suppresses lithium dendrites and shuttling effects:

[0030] 1) Preparation of Zn-MOF powder material: Dissolve 1mmol of adenine and 1mmol of 4,4-biphenyldicarboxylic acid (with a molar ratio of 1:1) in 20mL of DMF and ultrasonically dissolve to obtain solution A and solution B for later use , 1mmol of zinc acetate and 1g of polyvinylpyrrolidone were dissolved in 20 mL of DMF and ultrasonically dissolved to obtain solution C for later use. Mix solution A, solution B and solution C in a volume ratio of 1:1:1, and add volume The activated ratio is 5:4:1, dispersed in DMF, methanol and deionized water, and stirred at room temperature for 12 hours;

[0031] After the reaction stopped, under 8000r / min, centrifugal 5min, obtain white powder, after it is washed with DMF, MeOH successively, obtain Zn-MOF powder body material after drying in oven, as figure 1 Shown is the scanning electron microscope image of Zn-MOF pow...

Embodiment 2

[0036] Preparation of a dual-coated separator that simultaneously suppresses lithium dendrites and shuttling effects:

[0037]1) Preparation of Zn-MOF powder material: Dissolve 1mmol of adenine and 1mmol of 4,4-biphenyldicarboxylic acid in 20mL of DMF and ultrasonically dissolve it for later use; dissolve 1mmol of zinc acetate and 1g of polyvinylpyrrolidone in 20mL of Ultrasonic dissolution in DMF for standby, mix the above three DMF solutions with a volume ratio of 1:1:2, add the activated volume ratio of 5:4:1 and disperse them in DMF, methanol and deionized water, at room temperature Stir for 18h;

[0038] After the reaction is stopped, centrifuge at 8000r / min for 5min to obtain a white powder, which is washed with DMF and MeOH in turn, and dried in an oven to obtain a Zn-MOF powder material;

[0039] 2) Preparation of ZnNC carbon material: Calcining the Zn-MOF powder material prepared in step 1) in a tube furnace under a nitrogen atmosphere, calcining at 800°C for 4h, and...

Embodiment 3

[0043] Preparation of a dual-coated separator that simultaneously suppresses lithium dendrites and shuttling effects:

[0044] 1) Preparation of Zn-MOF powder material: Dissolve 1 mmol of adenine and 1 mmol of 4,4-biphenyldicarboxylic acid in 20 mL of DMF and ultrasonically dissolve them for later use; mix 1 mmol of zinc acetate with 1 g of polyvinylpyrrolidine Dissolve the ketone in 20 mL DMF and ultrasonically dissolve it for later use. Mix the above three DMF solutions at a ratio of 1:1:4 by volume, and add the activated dispersant in DMF, methanol, and Ionized water, stirred at room temperature for 24h;

[0045] After the reaction stopped, centrifuge at 8000 r / min for 5 min to obtain a white powder, which was washed with DMF and MeOH in turn, and dried in an oven to obtain a Zn-MOF powder material;

[0046] 2) Preparation of ZnNC carbon material: calcining the Zn-MOF powder material prepared in step 1) in a tube furnace under a nitrogen atmosphere, calcining at 800°C for ...

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Abstract

The invention belongs to the technical field of battery diaphragm materials, and particularly relates to a double-coating diaphragm capable of simultaneously inhibiting lithium dendrites and shuttle effect and a preparation method thereof. The double-coating diaphragm comprises a diaphragm and coating materials coating the two sides of the diaphragm. The coating materials comprise a Zn-MOF material and a ZnNC carbon material. The preparation method comprises the following steps: preparing a Zn-MOF powder material and a ZnNC carbon material; respectively blending a Zn-MOF powder material and aZnNC carbon material into slurry, and coating two sides of a battery diaphragm with the slurry. The double-coating diaphragm has a protection effect on a lithium negative electrode and an inhibition effect on shuttling of lithium polysulfide at the same time, and when the double-coating diaphragm is applied to a lithium-sulfur battery, the double-coating diaphragm has relatively excellent electrochemical cycling stability through electrochemical detection.

Description

technical field [0001] The invention belongs to the technical field of battery separator materials, and in particular relates to a double-coated separator capable of simultaneously suppressing lithium dendrites and shuttle effects and a preparation method thereof. Background technique [0002] A lithium-sulfur battery is a secondary battery that uses elemental sulfur or sulfur-containing materials as the positive electrode, and metallic lithium or lithium storage materials as the negative electrode. The charging and discharging process of lithium-sulfur batteries involves multi-step complex electrochemical reactions, and the active material undergoes a complex phase transition process of solid-liquid-solid phase, which creates some thorny problems that seriously restrict the practical application of lithium-sulfur batteries. Mainly include: positive electrode active material sulfur and product lithium sulfide have poor conductivity, volume expansion, rapid capacity fading ca...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14H01M10/052
CPCH01M10/052Y02E60/10
Inventor 洪旭佳宋春雷林佳娜蔡跃鹏
Owner SOUTH CHINA NORMAL UNIVERSITY
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