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Bilaterally-modified diaphragm special for battery and preparation method thereof

A modified and composite diaphragm technology, which is applied in the field of material chemistry, can solve the problems of unable to improve the cycle stability of lithium-sulfur batteries, reduce the energy density of the battery, and increase the thickness of the diaphragm, and achieve long-term stability of battery capacity and high interface compatibility. , Improve the effect of heat resistance

Active Publication Date: 2022-08-05
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The current method of modifying the diaphragm will increase the thickness of the diaphragm, reduce the energy density of the battery, and cannot improve the cycle stability and low output performance of lithium-sulfur batteries.

Method used

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  • Bilaterally-modified diaphragm special for battery and preparation method thereof
  • Bilaterally-modified diaphragm special for battery and preparation method thereof
  • Bilaterally-modified diaphragm special for battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] A method for preparing a CTP-PAN-LLZTO composite diaphragm, comprising the following steps:

[0059] (1) Preparation of PAN nanofiber membrane:

[0060] The polyacrylonitrile powder was dissolved in N,N-dimethylformamide, and a uniform spinning solution with a mass fraction of 8% was prepared by magnetic stirring, and then the multi-needle electrospinning control device was used for spinning. The voltage used is 15kV, the spinning speed is 0.6mL / h, and the receiving distance is 10cm; after spinning, drying is performed to obtain the PAN nanofiber membrane; the thickness is 25 μm;

[0061] (2) Preparation of CTP-PAN modified fiber membrane:

[0062] Dissolve melamine chloride in n-heptane to obtain an organic phase solution with a concentration of 0.5mM; dissolve piperazine in 10mL of water, and then add 200uL of N,N-diisopropylethylamine as a proton capture agent to obtain The aqueous phase solution, wherein the concentration of piperazine is 0.05M; the PAN nanofiber ...

Embodiment 2

[0069] A method for preparing a CTP-PAN-LLZTO composite diaphragm, comprising the following steps:

[0070] (1) Preparation of PAN nanofiber membrane:

[0071] The polyacrylonitrile powder was dissolved in N,N-dimethylformamide, and a homogeneous spinning solution with a mass fraction of 10% was prepared by magnetic stirring, and then the multi-needle electrospinning control device was used for spinning. The voltage used was 18kV, the spinning speed was 0.6mL / h, and the receiving distance was 15cm; after the spinning was dried, the PAN nanofiber membrane was obtained; the thickness was 32 μm;

[0072] (2) Preparation of CTP-PAN modified fiber membrane:

[0073] Dissolve melamine chloride in n-heptane to obtain an organic phase solution with a concentration of 0.5mM; dissolve piperazine in 10mL of water, and then add 200uL of N,N-diisopropylethylamine as a proton capture agent to obtain Aqueous phase solution, wherein the concentration of piperazine is 0.116M; infiltrate the ...

Embodiment 3

[0083] A method for preparing a CTP-PAN-LLZTO composite diaphragm, comprising the following steps:

[0084] (1) Preparation of PAN nanofiber membrane:

[0085]The polyacrylonitrile powder was dissolved in N,N-dimethylformamide, and a uniform spinning solution with a mass fraction of 8% was prepared by magnetic stirring. Then, the multi-needle electrospinning control device was used for spinning. The voltage used is 25kV, the spinning speed is 1.2mL / h, and the receiving distance is 30cm; after spinning, drying is performed to obtain the PAN nanofiber membrane; the thickness is 35 μm;

[0086] (2) Preparation of CTP-PAN modified fiber membrane:

[0087] Dissolve melamine chloride in n-heptane to obtain an organic phase solution with a concentration of 5mM; dissolve piperazine in 10mL of water, and then add 200uL of N,N-diisopropylethylamine as a proton capture agent to obtain water phase solution, wherein the concentration of piperazine is 5M; infiltrate the PAN nanofiber memb...

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Abstract

The invention discloses a double-side modified diaphragm special for a battery and a preparation method of the double-side modified diaphragm, and belongs to the field of material chemistry. An electrostatic spinning polyacrylonitrile (PAN) nanofiber membrane is adopted as a base material, an ultrathin covalent triazinepiperazine (CTP) nanomembrane is subjected to in-situ interfacial polymerization on the side, facing the positive electrode, of the diaphragm, and tantalum-doped garnet (LLZTO) nanoparticles are subjected to magnetron sputtering on the side, facing the negative electrode, of the diaphragm, so that the double-side modified diaphragm special for the battery is obtained. The prepared diaphragm has the advantages that the thickness increase of the diaphragm modified layer is extremely small, and the thicknesses of the interfacial polymerization CTP modified layer and the magnetron sputtering LLZTO modified layer are both lower than 1 micron; the problem that the thickness of the diaphragm is greatly increased due to a traditional modification method is avoided, so that the problems of slow ion transmission and energy density reduction in the battery are avoided. In addition, by adopting the PAN nanofiber membrane, the heat resistance of the diaphragm is greatly improved, so that the safe use temperature of the battery is guaranteed.

Description

technical field [0001] The invention relates to a double-sided modified battery special separator and a preparation method thereof, belonging to the field of material chemistry. Background technique [0002] As a necessary condition for human daily production and life, energy is an important driving force for social development. At the same time, energy is also a witness to the development of human society. With the gradual improvement of human environmental protection awareness and the continuous rise of oil prices, people pay more and more attention to environmental and energy issues. In order to seek solutions, people begin to explore the field of new energy. New energy vehicles are sought after by people with zero emission and zero pollution as their marketing strategies. [0003] The cruising range of commercial lithium-ion batteries is very limited, mainly due to the low theoretical energy density of lithium-ion batteries. As the most promising lithium secondary bat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/457H01M50/451H01M50/454H01M50/414H01M50/431H01M50/403H01M50/497B82Y30/00
CPCH01M50/457H01M50/451H01M50/454H01M50/414H01M50/431H01M50/403H01M50/497B82Y30/00Y02E60/10
Inventor 黄锋林武双林姚莹梅俞志锋马琦尧魏取福
Owner JIANGNAN UNIV