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Preparation method of Porous aragonite structure micron sheet, ceramic diaphragm and preparation method thereof

A ceramic diaphragm and microchip technology, applied in structural parts, final product manufacturing, sustainable manufacturing/processing, etc., can solve problems such as poor adhesion, easy agglomeration, and too small contact area between particles, and achieve strong wetting ability, The effect of good impact resistance

Active Publication Date: 2019-01-18
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are many problems in the zero-dimensional particles coated on the surface of commercial ceramic lithium-ion battery separators, such as uneven particle size, easy agglomeration, too small contact area between particles, poor adhesion, and small stress area when dealing with frontal impact. Easy to puncture and other issues

Method used

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  • Preparation method of Porous aragonite structure micron sheet, ceramic diaphragm and preparation method thereof
  • Preparation method of Porous aragonite structure micron sheet, ceramic diaphragm and preparation method thereof
  • Preparation method of Porous aragonite structure micron sheet, ceramic diaphragm and preparation method thereof

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preparation example Construction

[0030] Aiming at the characteristics of nacre and the characteristics of lithium-ion battery separators in the prior art, the present invention provides a method for preparing a porous aragonite micro-sheet. The porous aragonite-structure micro-sheet prepared by the method is actually a two-dimensional porous The calcium carbonate structure micro-sheet is used to prepare a diaphragm, which can make the diaphragm have better lithium ion conductivity, mechanical properties, wettability and mechanical properties. Specifically, the embodiment of the present invention discloses a method for preparing a porous aragonite microsheet, which includes the following steps:

[0031] A) treating the shell shell in an acid solution to obtain the shell shell nacre with an aragonite structure;

[0032] B) processing the shell shell nacre to obtain nacre fragments;

[0033] C) Treating the nacre fragments in an alkaline solution to obtain porous aragonite micro-sheets.

[0034] In the process...

Embodiment 1

[0046] Take 6.5kg of Korean white abalone shell (the front and back of the abalone shell are shown in the picture figure 1 Shown in a and d) in a 500ml beaker, then pour 10mol / L hydrochloric acid solution of 3 times the weight ratio, remove cuticle, prism layer, calcium carbonate of non-aragonite structure in the abalone shell at room temperature Outer verrucous and algae pigment impurities, a large amount of gas will be generated in the solution. When almost no bubbles are generated in the solution, take out the nacre of the abalone shell and wash off the acid solution on the surface of the nacre with deionized water, and put it in a 60°C oven After medium drying, the pure nacre with aragonite structure is obtained; then the abalone shell nacre is sandwiched between the polytetrafluoroethylene plates and placed on a press and loaded with a pressure of 10Mpa to crush the nacre;

[0047] Take 5g of nacre fragments and add them to a plastic beaker filled with 150mL NaOH solution...

Embodiment 2

[0050] Take 12.5kg of Australian green-lip abalone shell (the front and back of the abalone shell are shown in the picture figure 1 middle b and e) are placed in a 500mL beaker, and then poured into 6 times the weight ratio of 9mol / L nitric acid solution to remove the cuticle, prism layer, non-aragonite calcium carbonate, and outer warts in the abalone shell A large amount of gas will be generated in the solution; when there are almost no bubbles in the solution, take out the abalone shell nacre and wash off the acid solution on the surface of the nacre with deionized water, and dry it in an oven at 70°C Obtain pure nacre with aragonite structure; then sandwich the abalone shell nacre between polytetrafluoroethylene plates and place it on a press and load the pressure of 15Mpa to crush the nacre;

[0051] Take 5g of nacre fragments and add them to a plastic beaker filled with 150mL NaOH solution (3mol / L), use a mechanical stirring paddle to stir the above solution for 4 days, ...

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Abstract

The invention provides a preparation method of a porous aragonite structure micron sheet, comprising the following steps: A) processing the shell body is treated in an acid solution to obtain a shellbody nacre layer with the aragonite structure; B) processing that nacreous layer of the shell body to obtain nacreous layer fragments; C) treating that nacre fragments in an alkaline solution to obtain a porou aragonite structure micron sheet. The present application also provides a separator, the preparation method thereof, and a lithium ion battery. The invention adopts a simple preparation process to successfully separate a single-layer porous aragonite structure micron sheet from a natural shell body, and further applies the single-layer porous aragonite structure micron sheet to a diaphragm. Compared with the zero-dimensional nano-ceramic particle coating of commercial ceramic diaphragm, the porous aragonite structure microchip coating prepared in the present invention not only has good lithium ion conductivity, excellent electrolyte wettability and membrane breaking temperature of the diaphragm is improved, the mechanical strength is good, the scraping process is simple, and thediaphragm has great industrial application prospect.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery separator coatings, in particular to a preparation method of a porous aragonite structure micro-sheet, a ceramic separator and a preparation method thereof. Background technique [0002] Since Sony released green high-energy rechargeable lithium-ion batteries in the 1990s, secondary lithium-ion batteries have set off a technological revolution in the world. Since then, scientific research and industry have started to study the positive electrode, negative electrode, separator and electrolyte of lithium-ion batteries. Among them, the diaphragm has a crucial impact on the safety performance of lithium-ion batteries; with the rapid development of power batteries, the industry and academia have put forward higher requirements for their safety. [0003] Early researchers used polypropylene (PP) and polyethylene (PE) composites to increase the heat resistance and mechanical strength of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M10/058H01M50/403H01M50/434H01M50/449H01M50/489H01M50/491
CPCH01M10/0525H01M10/058H01M50/403H01M50/431H01M50/411H01M50/449Y02E60/10Y02P70/50
Inventor 姚宏斌宋永慧张天文
Owner UNIV OF SCI & TECH OF CHINA
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