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Montmorillonite modified lithium battery diaphragm and preparation method thereof

A lithium battery diaphragm and montmorillonite technology, which is applied in secondary batteries, battery pack parts, secondary battery repair/maintenance, etc., can solve the problems of low electrolyte absorption rate and large diaphragm thickness, and achieve ultra-high Electrolyte liquid absorption rate and retention rate, the effect of improving transferability and improving rate performance

Pending Publication Date: 2021-06-22
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the present invention aims to propose a montmorillonite-modified lithium battery diaphragm and a preparation method thereof, to solve the problems of large thickness of the existing lithium battery diaphragm and low liquid absorption rate of the electrolyte

Method used

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  • Montmorillonite modified lithium battery diaphragm and preparation method thereof
  • Montmorillonite modified lithium battery diaphragm and preparation method thereof
  • Montmorillonite modified lithium battery diaphragm and preparation method thereof

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preparation example Construction

[0034] combine Figure 5 As shown, the embodiment of the present invention provides a method for preparing a montmorillonite-modified lithium battery diaphragm, and the specific steps are:

[0035] S1. Disperse the pretreated montmorillonite in an aqueous solvent and stir evenly to obtain a montmorillonite precursor solution;

[0036] S2. Take the upper turbid liquid of the montmorillonite precursor solution, place it in a centrifuge tube and centrifuge to obtain nanoscale layered montmorillonite powder;

[0037] S3, dispersing the polymer binder in the water-based dispersant to form a water-based binder, and uniformly mixing the water-based binder with nano-scale layered montmorillonite powder to form a water-based coating slurry;

[0038] S4. Coating the water-based coating slurry on the surface of the lithium battery separator, and obtaining the montmorillonite-modified lithium battery separator after drying.

[0039] Montmorillonite material, its molecular formula is Al ...

Embodiment 1

[0056] This embodiment provides a method for preparing a montmorillonite-modified lithium battery diaphragm, and the specific steps are as follows:

[0057] (1) 1.013g of 800-mesh pretreated montmorillonite powder after lye treatment and ultrasonic classification treatment is placed in 100.000ml (78.550g) isopropanol (purity > 99.9%) solvent, at a rotating speed of 500rpm, In a constant temperature stirrer at a temperature of 30°C, stir for 5 minutes, and naturally cool to room temperature to obtain a montmorillonite precursor solution;

[0058] (2) Get 5.000ml of the upper turbid emulsion of the montmorillonite precursor solution of 100ml, quantitatively add it dropwise in a centrifuge tube, obtain nanoscale layered montmorillonite powder after centrifugation at 8000rpm for 10min, and weigh the solid mass as 0.064g;

[0059] (3) Take 2.009g of hydroxypropyl cellulose (HPC) with a molecular weight of 100,000 and dissolve it in 100.000ml of isopropanol solvent, and configure 20...

Embodiment 2

[0069] This embodiment provides a method for preparing a montmorillonite-modified lithium battery diaphragm, which differs from that of Embodiment 1 in that:

[0070] In step (1), 1.507g of pretreated montmorillonite powder is placed in 100.000ml (78.550g) of isopropanol solvent, and the rotation speed is 500rpm, and the temperature is 30°C in a constant temperature stirrer, stirring for 5min,

[0071] In step (2), the obtained nano-scale layered montmorillonite powder after centrifugation at 10000rpm for 8min, the weighing solid mass is 0.098g;

[0072] In step (4), get 0.473ml HPC binder and mix and stir with 0.098g nanoscale layered montmorillonite powder;

[0073] Other parameters are the same as in Example 1.

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Abstract

The invention provides a montmorillonite modified lithium battery diaphragm and a preparation method thereof, and the preparation method comprises the following steps: dispersing pretreated montmorillonite in an aqueous solvent, and uniformly stirring to obtain a montmorillonite precursor solution; taking the upper turbid solution of the montmorillonite precursor solution, and placing the upper turbid solution in a centrifugal tube for centrifugation to obtain nanoscale layered montmorillonite powder; dispersing a polymer binder in a water-based dispersant to form a water-based binder, and uniformly mixing the water-based binder with the nanoscale layered montmorillonite powder to form water-based coating slurry; and coating the surface of the lithium battery diaphragm with the aqueous coating slurry, and drying to obtain the montmorillonite modified lithium battery diaphragm. According to the montmorillonite modified lithium battery diaphragm provided by the invention, the liquid absorption rate of an electrolyte can be remarkably increased, the montmorillonite modified lithium battery diaphragm has relatively good ionic conductivity and cycling stability, and the preparation method is simple, low in cost and suitable for popularization.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a lithium battery diaphragm modified by montmorillonite and a preparation method thereof. Background technique [0002] Lithium-ion batteries are mainly composed of four parts: positive electrode, negative electrode, separator and electrolyte. The separator is a porous film between the positive and negative electrodes. It blocks the passage of electrons in the battery, but allows lithium ions to pass through, forming a charge and discharge circuit. The performance of the separator directly affects the capacity, cycle performance and safety performance of lithium-ion batteries. At present, polyolefin separator is the leading material for lithium-ion battery separators. Polyolefin separators are cheap, have excellent mechanical properties, and relatively stable chemical properties, but they have problems such as poor wettability, poor lyophilicity to electrolyte, and low ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/403H01M50/431H01M50/449H01M10/0525H01M10/42B82Y30/00B82Y40/00
CPCH01M10/0525H01M10/4235B82Y30/00B82Y40/00Y02E60/10
Inventor 徐林邓家辉麦立强张建永费凡
Owner WUHAN UNIV OF TECH