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Bimetal nitride modified diaphragm as well as preparation method and application thereof

A nitride, bimetal technology, applied in the field of electrochemistry, can solve the problems of poor mechanical properties of products, affecting electrochemical properties, easy to pierce the separator, etc., to achieve improved mechanical properties, good lithium ion transport performance and low electrochemical impedance. , Improve the effect of high temperature resistance

Pending Publication Date: 2020-07-14
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The product obtained by electrospinning has a large pore size, and polysulfides can easily pass through the separator to reach the surface of the lithium negative electrode, thereby causing corrosion of the lithium negative electrode and affecting the electrochemical performance. The mechanical properties of the product obtained by electrospinning are poor. When the negative electrode produces dendrites When it is easy to pierce the diaphragm, it will cause a short circuit of the battery, which will cause a certain safety hazard

Method used

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  • Bimetal nitride modified diaphragm as well as preparation method and application thereof
  • Bimetal nitride modified diaphragm as well as preparation method and application thereof
  • Bimetal nitride modified diaphragm as well as preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0043] A double metal nitride modified diaphragm for lithium-sulfur batteries, the diaphragm includes a diaphragm base and a modified functional layer attached to the surface of the diaphragm base, the modified functional layer includes a double metal nitride and a binder, and the double metal nitrogen The compound is molybdenum nickel nitride, and the binder is a perfluorosulfonic acid polymer, which is prepared by the following steps:

[0044] Step 1: Dissolve 1g of ammonium molybdate and 0.1 of nickel sulfate in 10g of deionized water, then transfer to the reactor, and react at 100°C for 2h;

[0045] Step 2: centrifuge the reaction solution in step 1 at a speed of 6000r / min for 0.2h to obtain an intermediate product;

[0046] Step 3: Dry the intermediate product obtained in step 2 at 50°C for 10 hours, then transfer it to a tube furnace and heat it with ammonia gas at 400°C for 1 hour, wherein the molar ratio of the intermediate product to ammonia is 1:3;

[0047] Step 4: ...

Embodiment 2

[0053] A double metal nitride modified diaphragm for lithium-sulfur batteries, the diaphragm includes a diaphragm base and a modified functional layer attached to the surface of the diaphragm base, the modified functional layer includes a double metal nitride and a binder, and the double metal nitrogen The compound is molybdenum nickel nitride, and the binder is a perfluorosulfonic acid polymer, which is prepared by the following steps:

[0054] Step 1: Dissolve 1 g of ammonium tetrathiomolybdate and 0.6 nickel nitrate in 15 g of deionized water, transfer to a reaction kettle, and react at 160 ° C for 3 h;

[0055] Step 2: centrifuge the reaction solution in step 1 at a speed of 8000r / min for 0.3h to obtain an intermediate product;

[0056] Step 3: The intermediate product obtained in step 2 was dried at 60°C for 10 hours, then transferred to a tube furnace and heated at 500°C for 2 hours with ammonia gas, wherein the molar ratio of the intermediate product to ammonia was 1:2;...

Embodiment 3

[0059] A double metal nitride modified diaphragm for lithium-sulfur batteries, the diaphragm includes a diaphragm base and a modified functional layer attached to the surface of the diaphragm base, the modified functional layer includes a double metal nitride and a binder, and the double metal nitrogen The compound is molybdenum nickel nitride, and the binder is a perfluorosulfonic acid polymer, which is prepared by the following steps:

[0060] Step 1: Dissolve 1g of ammonium phosphomolybdate and 1g of nickel chloride in 30g of deionized water, transfer them to a reaction kettle, and react at 200°C for 6h;

[0061] Step 2: centrifuge the reaction solution in step 1 at a speed of 12000r / min for 0.3h to obtain an intermediate product;

[0062] Step 3: Dry the intermediate product obtained in step 2 at 60°C for 15 hours and transfer it to a tube furnace for heating at 600°C for 3 hours with ammonia gas, wherein the molar ratio of the intermediate product to ammonia is 1:2;

[0...

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Abstract

The invention relates to a bimetal nitride modified diaphragm and a preparation method and application thereof. The diaphragm comprises a diaphragm substrate and a modified functional layer attached to the surface of the diaphragm substrate, and the modified functional layer comprises molybdenum-nickel nitride and a binder. The preparation method comprises the following steps: (a) dissolving molybdenum salt and nickel salt in water, performing heating for the first time and performing reacting, and performing centrifuging after the reaction to obtain an intermediate product; (b) drying the intermediate product, mixing the dried intermediate product with ammonia gas, and carrying out secondary heating and reaction to obtain bimetal nitride; (c) dissolving the bimetal nitride in an organic solvent, adding a binder, performing mixing to obtain a mixed solution, and carrying out suction filtration on the mixed solution under a vacuum condition by using the diaphragm substrate as suction filtration filter paper to obtain the bimetal nitride modified diaphragm. Compared with the prior art, the modified diaphragm has the advantages that the shuttle effect is effectively inhibited, the mechanical property is further improved, the probability of being pierced is greatly reduced, and the electrochemical performance of the lithium-sulfur battery is improved.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a bimetallic nitride modified separator and a preparation method and application thereof. Background technique [0002] With the rapid development of technologies such as electric vehicles, portable electronic devices and aerospace, traditional lithium-ion batteries can no longer meet the demand. The lithium-sulfur battery system uses sulfur or sulfur-containing compounds as the positive electrode, lithium or lithium storage materials as the negative electrode, and realizes the mutual conversion of electrical energy and chemical energy by breaking / generating sulfur-sulfur bonds. The characteristics of high specific capacity are gradually sought after by researchers. [0003] Lithium-sulfur batteries are mainly composed of positive electrode materials, electrolytes, separators, and negative electrode materials. There are mainly two discharge regions in the discharge process: high...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14H01M10/0525
CPCH01M10/0525H01M50/403H01M50/431H01M50/446Y02E60/10
Inventor 闵宇霖代仁强石章琴时鹏辉范金辰徐群杰朱晟
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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