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Composite coating sodium-ion battery diaphragm and preparation method thereof

A sodium-ion battery and composite coating technology, which is applied in secondary batteries, battery pack components, secondary battery repair/maintenance, etc., can solve the problem of poor liquid retention capacity of the diaphragm, high interface resistance, slow sodium ion transmission speed, etc. problem, to achieve the effect of increasing the transmission speed, improving the liquid retention capacity, and reducing the interface resistance

Pending Publication Date: 2021-11-19
东莞凯德新能源有限公司 +1
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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 polyolefin separators or alumina-coated separators, which have the following defects: the separator has poor liquid retention capacity, resulting in slow transmission of sodium ions, which affects the cycle performance of sodium-ion batteries; and, sodium ion transmission Slow speed will lead to high interface resistance of sodium-ion batteries, so that sodium dendrites are easy to form on the surface of the negative electrode. The growth of sodium dendrites will pierce the separator and cause a short circuit of the sodium-ion battery, thereby affecting the safety performance of the sodium-ion battery

Method used

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  • Composite coating sodium-ion battery diaphragm and preparation method thereof
  • Composite coating sodium-ion battery diaphragm and preparation method thereof
  • Composite coating sodium-ion battery diaphragm and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0059] Such as figure 1 As shown, the composite coating sodium ion battery separator includes a base film 1 , a sodium layer 2 and an aluminum oxide layer 3 which are sequentially stacked. Among them, the base film 1 is a polyethylene film with a thickness of 16 μm and a porosity of 45%; the sodium layer 2 consists of a mass percentage of 90% Na 7 / 9 Cu 2 / 9 Fe 1 / 9 mn 2 / 3 o 2 , 5% polyvinylidene fluoride and 5% polyvinylpyrrolidone, with a thickness of 2 μm; the aluminum oxide layer 3 is composed of 91.5% aluminum oxide, 0.5% calcium hydroxide, 3% polyacrylate and 5% carboxymethyl fiber Composed of plain sodium, the thickness is 1μm.

Embodiment 2

[0061] Such as figure 1 As shown, the composite coating sodium ion battery separator includes a base film 1 , a sodium layer 2 and an aluminum oxide layer 3 which are sequentially stacked. Among them, the base film 1 is a polyethylene film with a thickness of 16 μm and a porosity of 45%; the sodium layer 2 is composed of 90% NaPO 4 , 5% polyvinylidene fluoride and 5% polyvinylpyrrolidone, with a thickness of 2 μm; the aluminum oxide layer 3 is composed of 91.5% aluminum oxide, 0.5% calcium hydroxide, 3% polyacrylate and 5% carboxymethyl fiber Composed of plain sodium, the thickness is 1μm.

Embodiment 3

[0063] Such as figure 1 As shown, the composite coating sodium ion battery separator includes a base film 1 , a sodium layer 2 and an aluminum oxide layer 3 which are sequentially stacked. Among them, the base film 1 is a polyethylene film with a thickness of 16 μm and a porosity of 45%; the sodium layer 2 has a mass percentage of 88% Na 7 / 9 Cu 2 / 9 Fe 1 / 9 mn 2 / 3 o 2 , 6% polyvinylidene fluoride and 6% polyvinylpyrrolidone, with a thickness of 2 μm; the aluminum oxide layer 3 is composed of 89.4% aluminum oxide, 0.6% calcium hydroxide, 4% polyacrylate and 6% carboxymethyl fiber Composed of plain sodium, the thickness is 1μm.

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Abstract

The invention relates to the technical field of sodium-ion battery preparation, in particular to a composite coating sodium-ion battery diaphragm and a preparation method thereof. The composite coating sodium-ion battery diaphragm comprises a base membrane, a sodium layer coated on one side of the base membrane, and an aluminum oxide layer deviating from the base membrane and coated on one side of the sodium layer. According to the composite coating sodium-ion battery diaphragm, the sodium layer is coated between the base membrane and the aluminum oxide layer, so that the liquid retention capability of the diaphragm can be obviously improved so as to accelerate the transmission speed of sodium ions; and the quickening of the sodium ion transmission speed not only can improve the cycle performance of the sodium ion battery, but also can reduce the interface resistance, and prevents sodium dendrites from piercing the diaphragm so as to improve the safety performance of the sodium ion battery.

Description

technical field [0001] The invention relates to the technical field of secondary battery preparation, in particular to a composite coating sodium ion battery diaphragm and a preparation method thereof. Background technique [0002] With the development of new energy sources, secondary charge and discharge batteries are facing opportunities and challenges. At present, the development of lithium-ion batteries is very rapid, and they are widely used in energy, aerospace, chemical, medical and other fields. However, the reserves of lithium on the earth are limited and cannot meet the needs of large-scale applications, and the same main group of sodium is abundant on the earth. Therefore, Na-ion batteries are considered as "candidates" for next-generation energy storage batteries. [0003] Sodium-ion batteries mainly include positive electrode, electrolyte, negative electrode, and diaphragm. The diaphragm is called the third "electrode material" in the battery. It can be seen th...

Claims

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Application Information

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IPC IPC(8): H01M50/457H01M50/431H01M50/446H01M50/403H01M50/417H01M10/054H01M10/42
CPCH01M50/457H01M50/431H01M50/446H01M50/403H01M50/417H01M10/054H01M10/4235Y02E60/10
Inventor 梁进觉张志平高旭光徐宁侯峰杨波李宗植王永湘
Owner 东莞凯德新能源有限公司