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Lithium-sulfur battery diaphragm and preparation method thereof

A lithium-sulfur battery and diaphragm technology, which is applied in the field of lithium-sulfur battery diaphragm preparation, can solve the problems of lithium-sulfur battery actual capacity reduction, attenuation, hindering electrons, ion transport electrochemical reactions, etc., and achieve good thermal stability and electrolyte Wettability, low cost, and the effect of suppressing the shuttling effect

Inactive Publication Date: 2019-08-09
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially in lithium-sulfur batteries, since the positive electrode sulfur is gradually reduced to soluble long-chain polysulfides during charging and discharging, it inevitably dissolves and diffuses through the separator to the lithium negative electrode along with the concentration gradient, and is further reduced to The irreversible deposition of short-chain polysulfides in the dead volume of the separator greatly hinders electron and ion transport and further electrochemical reactions, resulting in a decrease in the actual capacity and rapid decay of lithium-sulfur batteries accompanied by severe self-destruction. discharge effect

Method used

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  • Lithium-sulfur battery diaphragm and preparation method thereof
  • Lithium-sulfur battery diaphragm and preparation method thereof

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Effect test

Embodiment 1

[0029] A lithium-sulfur battery diaphragm is a porous film prepared by using a non-solvent induced phase separation method to prepare a polyvinyl alcohol (PVA) / carboxymethyl cellulose sodium (CMC-Na) blending film casting solution.

[0030] The preparation method of the above-mentioned lithium-sulfur battery separator is:

[0031] The first step: PVA (Sigma-Aldrich, Mw 85,000-124,000, 99+% hydrolyzed) and CMC-Na (Dacellul CMC2200) were dissolved in deionized water to prepare 10wt% and 8wt% polymer aqueous solutions respectively;

[0032] The second step: the PVA aqueous solution and the CMC-Na aqueous solution are mixed into a homogeneous blended film casting solution based on the CMC-Na accounting for 15% of the total polymer mass fraction, and the total polymer mass fraction in the film casting solution is 8%. After standing for defoaming, spread the casting liquid evenly on the glass plate with a spatula;

[0033] The third step: Place the glass plate coated with the casting liquid...

Embodiment 2

[0035] A lithium-sulfur battery diaphragm is a porous film prepared by using a non-solvent induced phase separation method to prepare a polyvinyl alcohol (PVA) / carboxymethyl cellulose sodium (CMC-Na) blending film casting solution.

[0036] The preparation method of the above-mentioned lithium-sulfur battery separator is:

[0037] The first step: PVA (Sigma-Aldrich, Mw 85,000-124,000, 99+% hydrolyzed) and CMC-Na (Dacellul CMC2200) were dissolved in deionized water to prepare 10wt% and 8wt% polymer aqueous solutions respectively;

[0038] The second step: the PVA aqueous solution and the CMC-Na aqueous solution are mixed into a homogeneous blended film casting solution based on the CMC-Na accounting for 20% of the total polymer mass fraction, and the total polymer mass fraction in the film casting solution is 8%. After standing for defoaming, spread the casting liquid evenly on the glass plate with a spatula;

[0039] The third step: the glass plate coated with the casting solution is ...

Embodiment 3

[0041] A lithium-sulfur battery diaphragm is a porous film prepared by using a non-solvent induced phase separation method to prepare a polyvinyl alcohol (PVA) / carboxymethyl cellulose sodium (CMC-Na) blending film casting solution.

[0042] The preparation method of the above-mentioned lithium-sulfur battery separator is:

[0043] Step 1: Dissolve PVA (Sigma-Aldrich, Mw 85,000-124,000, 99+% hydrolyzed) and CMC-Na (Dacellul CMC2200) in deionized water to prepare 10wt% and 8wt% polymer aqueous solutions respectively. ;

[0044] The second step: the PVA aqueous solution and the CMC-Na aqueous solution are mixed into a homogeneous blended film casting solution based on CMC-Na accounting for 25% of the total polymer mass fraction, and the total polymer mass fraction in the film casting solution is 8%. After standing for defoaming, spread the casting liquid evenly on the glass plate with a spatula;

[0045] The third step: Place the glass plate coated with the casting solution in an absolu...

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Abstract

The invention provides a preparation method of a lithium-sulfur battery diaphragm, and the method is characterized by comprising the following steps: 1, respectively dissolving PVA and CMC-Na in deionized water to prepare polymer aqueous solution; 2, mixing PVA water solution and CMC-Na aqueous solution in proportion to form homogeneous blended membrane casting solution, performing standing for defoaming, and uniformly spreading the membrane casting solution on a glass plate by using a scraper; 3, soaking the glass plate coated with the membrane casting solution in an absolute ethyl alcohol coagulating bath, and drying the glass plate in a drying oven to obtain the lithium-sulfur battery diaphragm with ion selectivity. Compared with a traditional polypropylene diaphragm, the ion selectivelithium-sulfur battery diaphragm prepared by the invention has the advantages that the comprehensive performance is obviously improved, and a new solution is provided for large-scale application of the lithium-sulfur battery.

Description

Technical field [0001] The invention relates to a method for preparing a lithium-sulfur battery diaphragm with ion selectivity, and belongs to the technical field of lithium-sulfur battery diaphragms. Background technique [0002] With the increasingly severe global energy and environmental problems, the society's demand for the development and utilization of sustainable energy is increasing. Lithium-ion batteries have been widely used as an effective electrochemical storage and release of energy. Unfortunately, the low specific capacity and low energy density of lithium-ion batteries limit their applications in various emerging mobile transportation, such as low-carbon electric vehicles. As an energy storage system with broad application prospects, lithium-sulfur batteries have higher theoretical specific capacity and energy density. When elemental sulfur undergoes a redox reaction, it gains and loses double electrons. When used as a cathode material, the theoretical specific ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16
CPCH01M50/403H01M50/411H01M50/44Y02E60/10
Inventor 刘天西雒香缪月娥陈雨阳
Owner DONGHUA UNIV
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