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Coating diaphragm as well as preparation method and application thereof

A membrane and coating technology, applied in the field of coating membrane and its preparation, can solve the problems of inability to completely suppress dendrites, and achieve the effects of component and content optimization, high flatness, and no dendrites

Active Publication Date: 2021-07-13
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, none of the above methods can fundamentally control the ion concentration gradient inside the solution and the space charge layer on the surface of the negative electrode, which can only alleviate the dendrite problem to a certain extent, and cannot completely inhibit the formation of dendrites.

Method used

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  • Coating diaphragm as well as preparation method and application thereof
  • Coating diaphragm as well as preparation method and application thereof
  • Coating diaphragm as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0066] A kind of exfoliated hydrotalcite containing anion-fixed structure, the preparation method is as follows:

[0067] (1) Commercially purchased magnesium-aluminum hydrotalcite (Mg-Al LDH) was calcined at 450°C for 5 hours under an argon atmosphere to obtain a double-layer oxide free of carbonate ions and water; the above-mentioned double-layer oxide was dispersed In 15 mL ethanol / H containing 0.3 g lithium bistrifluoromethanesulfonimide (LiTFSI) 2 O mixed solution (12mL ethanol, 3mL H 2 O) was stirred at 70° C. for 12 h to obtain a pre-layered Mg-Al LDH;

[0068] (2) The pre-layered Mg-Al LDH obtained in step (1) was centrifuged and calcined at 250 °C for 3 h under an argon atmosphere to remove H in the intermediate layer 2 O, obtain intermediate product;

[0069] (3) Disperse 1.15 g of the intermediate product obtained in step (2) in 30 mL of N,N-dimethylformamide (DMF) containing 2.3 g of LiTFSI, and perform ultrasonic treatment and stirring for a total of 12 hours t...

preparation example 2

[0071] A kind of exfoliated hydrotalcite containing anion-fixed structure, its difference with Preparation Example 1 is only that LiTFSI in step (2) and step (3) is used lithium hexafluorophosphate (LiPF 6) replacement, the exfoliated Mg-Al LDH with anion-fixed structure was obtained.

preparation example 3-6

[0073] A kind of exfoliated hydrotalcite containing anion-fixed structure, its difference from Preparation Example 1 is that the quality of the intermediate product in step (3) is respectively 2.8g, 2.3g, 0.6g, 0.4g, to obtain anion-fixed structure exfoliated Mg-Al LDH.

[0074] The materials used in the following examples of the present invention and comparative examples include:

[0075] Diaphragm substrate: single-layer polypropylene diaphragm, Celgard 2400;

[0076] Binder: Polyvinylidene Fluoride (PVDF), Source Leaf, S25907.

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Abstract

The invention provides a coating diaphragm as well as a preparation method and application thereof. The coating diaphragm comprises a diaphragm substrate and a coating arranged on at least one surface of the diaphragm substrate, and the material of the coating comprises a combination of a binder and delaminated hydrotalcite containing an anionic fixing structure. The preparation method of the coating diaphragm comprises the following steps of uniformly mixing the delaminated hydrotalcite containing the anion fixed structure, the binder and the organic solvent to obtain coating slurry; and coating at least one surface of the diaphragm substrate with the obtained coating slurry, and drying to obtain the coating diaphragm. The coating diaphragm provided by the invention is applied to a lithium secondary battery, so that the growth of lithium dendrites can be effectively inhibited, and the coating diaphragm has an important application value.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a coating diaphragm, a preparation method and application thereof. Background technique [0002] In recent years, lithium-ion batteries have been widely used in power batteries, 3C batteries and energy storage systems due to their high energy density. However, with the increasing demand for high-energy-density batteries and the development of various high-energy-density cathode materials, the graphite anode commonly used in commercial lithium-ion batteries has been unable to meet the demand. In order to increase the energy density of the battery, one of the solutions is to apply a battery with a higher theoretical energy density (3860mA hg -1 ) lithium metal anode. However, due to the high reactivity of metal lithium, it is easy to generate dendrites when it is used as an anode material and lead to a decrease in the cycle performance of the battery. The reasons f...

Claims

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Application Information

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IPC IPC(8): H01M50/403H01M50/409H01M50/449H01M10/0525
CPCH01M10/0525Y02E60/10
Inventor 展琦周天易江鹏
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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