Sodium-ion battery diaphragm and preparation method thereof

A technology for sodium-ion batteries and diaphragms, which is applied to battery pack parts, circuits, electrical components, etc. It can solve problems such as difficulty in controlling the uniformity of thickness, application limitations of polyolefin porous membranes, and high price of glass fiber diaphragms. Excellent rated capacity, low interfacial internal resistance, and high dielectric constant

Inactive Publication Date: 2019-08-13
ZHONGYUAN ENGINEERING COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used separators for sodium-ion batteries are glass fiber separators, and some researchers use polyolefin porous membranes, which have extremely poor wettability to carbonate solvents. Therefore, the application of polyolefin porous membranes is limited.
[0004] The glass fiber separator commonly used in the prior art is relatively expensive, and the thickness of the glass fiber separator is relatively large. During the experiment, in order to reduce the thickness of the separator, it needs to be torn in the thickness direction, and it is difficult to control the uniformity of its thickness.
In addition, the thicker glass fiber separator requires more electrolyte when assembling the battery, which ultimately leads to lower overall energy of the sodium battery.

Method used

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  • Sodium-ion battery diaphragm and preparation method thereof
  • Sodium-ion battery diaphragm and preparation method thereof
  • Sodium-ion battery diaphragm and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0027] The preparation method of the sodium ion battery diaphragm of the present embodiment, the steps are as follows:

[0028] (1) Preparation of spinning solution: put commercially available PVDF and PAN powders in 60 o Dry in a vacuum oven at about C for 12 hours, then add the mixed powder of PVDF (0.75 g) and PAN (0.45 g) with a mass ratio of 5:3 to 10 ml of a mixed solvent of DMF and acetone with a volume ratio of 8:2, Put a magnet in the above solution and seal it with plastic wrap, and place it at 60 o Stir on a constant temperature magnetic stirrer in C for 2 h to completely dissolve PVDF and PAN, then move the above solution to a six-connected magnetic stirrer at room temperature and stir for 12 h at room temperature to prepare a uniform spinning solution with a concentration of 12%. Finally, the above-mentioned uniform spinning solution is left to stand for a period of time in a vacuum environment, and the air bubbles in the spinning solution are removed;

[0029] ...

Embodiment 2

[0036] The preparation method of the sodium ion battery diaphragm of the present embodiment, the steps are as follows:

[0037] (1) Preparation of spinning solution: put commercially available PVDF and PAN powders in 60 o Dry in a vacuum oven at about C for 12 hours, and then add PVDF (0.9 g) and PAN (0.3 g) mixed powder with a mass ratio of 6:2 to 10 ml of a mixed solvent of DMF and acetone with a volume ratio of 8:2, Put a magnet in the above solution and seal it with plastic wrap, and place it at 60 o Stir on a constant temperature magnetic stirrer in C for 2 h to completely dissolve PVDF and PAN, then move the above solution to a six-connected magnetic stirrer at room temperature and stir for 12 h at room temperature to prepare a uniform spinning solution with a concentration of 12%. Finally, the above-mentioned uniform spinning solution is left to stand for a period of time in a vacuum environment, and the air bubbles in the spinning solution are removed;

[0038] (2) P...

Embodiment 3

[0041] The preparation method of the sodium ion battery diaphragm of the present embodiment, the steps are as follows:

[0042] (1) Preparation of spinning solution: put commercially available PVDF and PAN powders in 60 o Dry in a vacuum oven at about C for 12 hours, then add the mixed powder of PVDF (0.75 g) and PAN (0.45 g) with a mass ratio of 5:3 to 10 ml of a mixed solvent of DMF and acetone with a volume ratio of 8:2, Put a magnet in the above solution and seal it with plastic wrap, and place it at 60 o Stir on a constant temperature magnetic stirrer in C for 2 h to completely dissolve PVDF and PAN, then move the above solution to a six-connected magnetic stirrer at room temperature and stir for 12 h at room temperature to prepare a uniform spinning solution with a concentration of 12%. Finally, the above-mentioned uniform spinning solution is left to stand for a period of time in a vacuum environment, and the air bubbles in the spinning solution are removed;

[0043] ...

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Abstract

The invention discloses a sodium-ion battery diaphragm and a preparation method thereof. The specific method comprises the following steps: adding a certain amount of mixed powder of PVDF and PAN (indifferent mass ratios) into an appropriate solvent; placing the mixture on a constant-temperature magnetic stirrer at a certain temperature, stirring the mixture for 2 hours to completely dissolve PVDF and PAN, then performing stirring at normal temperature for 12 hours to obtain uniform spinning solution with a certain concentration, placing the uniform spinning solution silently in a vacuum environment for a period of time, and removing bubbles in the spinning solution; and then sucking the spinning solution into an injector after standing and defoaming, preparing a PVDF / PAN composite nano-microporous diaphragm by utilizing an electrostatic spinning technology, and then drying and storing the prepared diaphragm for later use. The preparation method is simple in process and low in cost, and the prepared PVDF / PAN composite nano-diaphragm has the advantages of high ionic conductivity, high porosity, uniform pore size distribution, good electrolyte wettability, good cycle performance andthe like.

Description

technical field [0001] The invention relates to the technical field of membranes of energy storage materials, in particular to a diaphragm for a sodium ion battery and a preparation method thereof. Background technique [0002] Na-ion batteries have the advantages of high energy density, abundant resources, and low cost. Therefore, this secondary battery will play an important role in future energy storage device systems. A sodium ion battery is a secondary battery with a sodium ion concentration difference. When charging, sodium ions pass through the diaphragm from the positive electrode to the negative electrode, and form sodium element at the negative electrode with the electrons of the external circuit; during discharge, the sodium of the negative electrode decomposes into sodium ions and electrons, and the electrons are discharged through the external circuit to provide energy, and the sodium ions pass through the battery inside the battery. The separator reaches the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16D01D5/00D04H1/4382D04H1/728
CPCD01D5/003D01D5/0061D01D5/0092D04H1/4382D04H1/728H01M50/403H01M50/431H01M50/44Y02E60/10
Inventor 刘忠柱李高杰潘玮秦琦焦明立米立伟
Owner ZHONGYUAN ENGINEERING COLLEGE
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