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Preparation method of separator for sodium ion battery

A sodium-ion battery and diaphragm technology, applied in secondary batteries, battery components, circuits, etc., can solve the problems of large electrolyte liquid volume, low strength, and increased internal resistance of the battery system, and achieve simple production processes Easy to control, high heat resistance and stability, uniform pore distribution

Inactive Publication Date: 2018-06-22
WUHAN BAIQI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process of glass fiber separator is complicated, so the price is high; and its strength is low, it is easy to fall off chips, especially when it is dried at high temperature, it is easy to embrittle, and there are great safety hazards; Increased internal resistance, large amount of electrolyte liquid required by the battery, etc.

Method used

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  • Preparation method of separator for sodium ion battery
  • Preparation method of separator for sodium ion battery
  • Preparation method of separator for sodium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A preparation method for a diaphragm for a sodium ion battery, comprising the steps of:

[0025] S1, respectively measure 9.7ml of N-methylformamide and 300μl of glycerin, mix and stir in the sample bottle for 1h to obtain a (DMF-glycerol) homogeneous solution, set aside;

[0026] S2. Weigh 5g of polyvinylidene fluoride powder into a round bottom flask, add 4ml of prepared (DMF-glycerol) solution, and stir at 550r / min magnetic force for 5h at a constant temperature of 20°C to obtain a uniformly dissolved gel slurry;

[0027] S3. After the gel slurry obtained in step S2 is left to stand for a while, the air bubbles therein are completely removed;

[0028] S4. Use a pipette to absorb 2ml of the clear gel paste obtained in step S3 and drop it onto a smooth glass plate, and spread it evenly with a 200 μm spatula to form a film;

[0029] S5. Cover the slurry-coated substrate obtained in step S4 with a petri dish, let it stand for a while, put it in a vacuum oven, dry it in ...

Embodiment 2

[0031] A preparation method for a diaphragm for a sodium ion battery, comprising the steps of:

[0032] S1, respectively measure 9.7ml of acetone and 300 μl of glycerin, mix and stir in the sample bottle for 1 hour to obtain a homogeneous solution of (acetone-glycerol), set aside;

[0033] S2. Weigh 5g of polyvinylidene fluoride powder into a round bottom flask, then add 4ml of the prepared (acetone-glycerin) solution, and stir at 550r / min magnetic force for 5h at a constant temperature of 20°C to obtain a uniformly dissolved gel slurry;

[0034] S3. After the gel slurry obtained in step S2 is left to stand for a while, the air bubbles therein are completely removed;

[0035] S4. Use a pipette to absorb 2ml of the clear gel paste obtained in step S3 and drop it onto a smooth glass plate, and spread it evenly with a 200 μm spatula to form a film;

[0036] S5. Cover the slurry-coated substrate obtained in step S4 with a petri dish, let it stand for a while, put it in a vacuum o...

Embodiment 3

[0038] A preparation method for a diaphragm for a sodium ion battery, comprising the steps of:

[0039] S1, respectively measure 8.5ml of N-methylformamide and 1.5ml of deionized water, mix and stir in the sample bottle for 1h to obtain a (DMF-deionized water) uniform solution, set aside;

[0040] S2. Weigh 5g of polyvinylidene fluoride powder into a round bottom flask, then add 6ml of the prepared (DMF-deionized water) solution, and stir at 550r / min magnetic force for 5h at a constant temperature of 80°C to obtain a uniformly dissolved gel pulp;

[0041] S3. After the gel slurry obtained in step S2 is left to stand for a while, the air bubbles therein are completely removed;

[0042] S4. Use a pipette to absorb 2ml of the clear gel paste obtained in step S3 and drop it onto a smooth glass plate, and spread it evenly with a 200 μm spatula to form a film;

[0043] S5. After covering the substrate coated with the slurry obtained in step S4 with a petri dish, let it stand for a...

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Abstract

The invention belongs to the technical field of a separator for a sodium ion battery, and particularly relates to a preparation method of the separator for the sodium ion battery. The preparation method of the separator comprises the following steps of firstly, preparing a mixed solution of a solvent-solvent 2 of a corresponding polymer according to a certain proportion; secondly, uniformly mixingpolymer powder and the mixed solution according to a certain solid-liquid mass ratio, and heating and stirring under a certain temperature to turn into uniform paste; and thirdly, coating the obtained paste onto a smooth substrate, and performing demolding after drying or performing drying after water bath demolding, thereby obtaining the required product. The separator has the beneficial effectsof low cost, simple preparation method, high industrial degree, low manufacturing cost and high stability.

Description

technical field [0001] The invention belongs to the technical field of diaphragms for sodium-ion batteries, and in particular relates to a preparation method for diaphragms for sodium-ion batteries. Background technique [0002] Since the advent of lithium-ion batteries, they have been widely used as energy storage devices in many fields. While they have developed rapidly, they have also greatly promoted the progress of today's technological development. But behind the development is the huge consumption of lithium resources. With the increase of development efforts and difficulty, the price of lithium has risen sharply, and it is considered that it may be exhausted in the next few decades. Therefore, the development of lithium-ion batteries that can replace A new type of secondary battery is imperative. As a congener element of lithium, sodium is also a very active alkali metal with properties similar to lithium, Na / Na + The standard electrode potential of lithium is -2.7...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M10/054H01M50/403
CPCH01M10/054H01M50/403Y02E60/10
Inventor 不公告发明人
Owner WUHAN BAIQI TECH CO LTD
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