Lithium battery modified diaphragm, preparation method thereof and lithium battery

A lithium battery separator, lithium battery technology, applied in lithium batteries, battery pack parts, non-aqueous electrolyte batteries, etc., can solve problems such as piercing the separator and lithium dendrite growth, achieve strong coordination ability, reduce deposition Potential, the effect of inhibiting the growth of lithium dendrites

Pending Publication Date: 2022-07-08
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In view of this, the present application provides a lithium battery modified diaphragm and its preparation method and lithium battery, whi

Method used

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  • Lithium battery modified diaphragm, preparation method thereof and lithium battery
  • Lithium battery modified diaphragm, preparation method thereof and lithium battery
  • Lithium battery modified diaphragm, preparation method thereof and lithium battery

Examples

Experimental program
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Example Embodiment

[0059] Example 1

[0060] The present embodiment 1 provides a preparation method of a lithium battery modified diaphragm, and the preparation method includes the following steps:

[0061] Step 1. Prepare MAF-4 powder:

[0062] Step 1.1, take 10mmol of zinc nitrate hexahydrate and disperse it in 100mL of 25% ammonia solution to obtain A solution, take 20mmol of 2-methylimidazole and disperse it in 100mL of anhydrous methanol to obtain B solution, A and B solutions are respectively in a water bath at 25°C Magnetic stirring for 40min, after uniform dispersion, B solution was added dropwise to A solution at a drop rate of 60 drops / min, and the reaction was continued to stir for 5h to obtain a milky white MAF-4 precursor suspension;

[0063] Step 1.2. Centrifugal separation of the milky white MAF-4 precursor suspension, washing and centrifugation. After drying for 12h and vacuum activation at 150℃ for 3h, the obtained white powder is MAF-4;

[0064] Step 2. Preparation of host-g...

Example Embodiment

[0070] Example 2

[0071] The present embodiment 2 provides a preparation method of a lithium battery modified diaphragm, and the preparation method includes the following steps:

[0072] Step 1. Prepare MAF-4 powder:

[0073] Step 1.1, take 20mmol of zinc nitrate hexahydrate and disperse it in 200mL of 25% ammonia solution to obtain A solution, take 40mmol of 2-methylimidazole and disperse it in 200mL of anhydrous methanol to obtain B solution, A and B solutions are respectively water bathed at 25°C Magnetic stirring for 60min, after uniform dispersion, B solution was added dropwise to A solution at a drop acceleration rate of 120 drops / min, and the reaction was continued to stir for 7h to obtain a milky white MAF-4 precursor suspension;

[0074] Step 1.2. Centrifuge the milky white MAF-4 precursor suspension and wash the centrifuged product. The washing method is to use anhydrous methanol for three times, and the speed of the centrifuge is 8000 rpm; After vacuum activation...

Example Embodiment

[0091] Example 3

[0092] In Example 3, performance tests were performed for lithium batteries including the modified separator for lithium batteries provided in Example 1 of the present application, the lithium battery separator provided in Comparative Example 1, and the MAF-4 / PP separator provided in Comparative Example 2.

[0093] The assembly process of the lithium battery including the lithium ion battery modified separator provided in Example 1 of the present application includes: first assembling the separator into a Li|Cu half-cell and a Li|Li symmetrical battery in a glove box filled with high-purity argon, and the negative electrode All use lithium metal, the electrolyte is 1M LiTFSI DOL / DME (V:V=1:1) + 1wt% anhydrous lithium nitrate, the volume of the added electrolyte is 30μL, and the assembled battery is a CR2032 type button battery. The button cell was left standing at room temperature of 25°C for 6 hours.

[0094] The assembling process of the lithium battery i...

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Abstract

The invention belongs to the technical field of lithium batteries, and particularly relates to a lithium battery modified diaphragm and a preparation method thereof and a lithium battery, the lithium battery modified diaphragm comprises a lithium battery diaphragm and an MAF-4-AZO layer, the MAF-4-AZO layer modifies the lithium battery diaphragm, AZO in the MAF-4-AZO layer inhibits lithium dendrite growth to pierce the diaphragm, meanwhile, the deposition overpotential of lithium metal is effectively reduced, and the performance of the lithium battery is improved. Therefore, the technical problem that the lithium metal negative electrode is easy to generate lithium dendrite growth to pierce the diaphragm is solved.

Description

technical field [0001] The application belongs to the technical field of lithium batteries, and in particular relates to a lithium battery modified diaphragm, a preparation method thereof, and a lithium battery. Background technique [0002] There is an urgent need for energy storage batteries in the fields of new energy power generation peak regulation, new energy vehicle power output and portable electronic equipment. Among various energy storage batteries such as lithium batteries, sodium batteries and potassium batteries, the most widely used batteries are Lithium batteries, however, the energy density of lithium batteries currently used in practical applications is not high enough to meet the demand. [0003] Lithium metal anode (LMA) has an extremely high theoretical specific capacity (3860mAh g -1 ), the lowest electrochemical potential (-3.040V vs. standard hydrogen electrode), and low mass density. Therefore, theoretically, a lithium battery composed of a lithium m...

Claims

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Application Information

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IPC IPC(8): H01M50/449H01M50/446H01M50/403H01M10/42H01M10/052
CPCH01M50/449H01M50/446H01M50/403H01M10/4235H01M10/052Y02E60/10
Inventor 李成林陈驰柯曦
Owner GUANGDONG UNIV OF TECH
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