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Lithium-sulfur diaphragm with synergistic effect mechanism, preparation method of lithium-sulfur diaphragm and lithium-sulfur battery

A synergistic and diaphragm technology, applied in lithium batteries, battery pack components, non-aqueous electrolyte batteries, etc., can solve the problems of affecting charge balance, reducing Coulomb efficiency, poor electrical conductivity, etc., to suppress shuttle, improve cycle effect, The effect of cycle performance improvement

Inactive Publication Date: 2020-07-03
安徽金力新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this application can suppress the phenomenon of polylithium sulfur shuttling to the negative electrode side to a certain extent and improve the utilization rate of sulfur in the lithium-sulfur battery system, the positive and negative functional layers of the functionalized separator in this application are the same additive layer. It is a layer of negatively charged polymer coated on the basis of conductive materials. Due to the coated core-shell structure, its electrical conductivity is relatively poor, and both the positive and negative electrodes are coated with negative charges, forming a large The negative charge space also affects the charge balance to a certain extent and reduces the Coulombic efficiency

Method used

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  • Lithium-sulfur diaphragm with synergistic effect mechanism, preparation method of lithium-sulfur diaphragm and lithium-sulfur battery
  • Lithium-sulfur diaphragm with synergistic effect mechanism, preparation method of lithium-sulfur diaphragm and lithium-sulfur battery
  • Lithium-sulfur diaphragm with synergistic effect mechanism, preparation method of lithium-sulfur diaphragm and lithium-sulfur battery

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preparation example Construction

[0043] The preparation method of the above-mentioned synergistic mechanism lithium-sulfur diaphragm of the present invention comprises the following steps:

[0044] Step 1. Prepare positive side functional layer 1 slurry

[0045] Disperse the porous conductive carbon material and the corresponding dispersant in a mixed solvent, and perform sand milling or ultrasonic treatment for 2-4 hours to obtain a porous conductive carbon material dispersion. Scanning with an electron microscope, the carbon material forms a porous conductive network structure; take quantitative Add the corresponding dispersant to the porous conductive dispersion liquid, and then perform mechanical stirring, the stirring time is 15-30min, the rotating speed is 800-1500r / min, preferably 900-1200r / min, and the stirring temperature is 15-30°C; After stirring the system to a uniform state, add the corresponding binder and surfactant to it, and then perform mechanical stirring. The stirring time is 30-90min, pre...

Embodiment 1

[0054]A lithium-sulfur separator with a synergistic mechanism in this embodiment includes a separator base film 2 and a positive electrode side functional layer 1 and a negative electrode side functional layer 3 respectively coated on both sides of the separator base film 2 . The components of the positive electrode side functional layer 1 include a porous conductive carbon material, a dispersant, a binder, a surfactant, and a mixed solvent. Specifically, the porous conductive carbon material is spherical carbon nanotubes, and its addition amount is 0.5% of the total weight of the side functional layer 1; the dispersant is polyvinyl alcohol, and its addition is 4.5% of the total weight of the positive side functional layer 1; the binder is polyacrylic acid, and its addition is the positive side functional layer 1. 7.5% of the total weight of layer 1; the surfactant is fatty alcohol polyoxyethylene ether, and its addition amount is 7.5% of the total weight of the positive electr...

Embodiment 2

[0063] A lithium-sulfur separator with a synergistic mechanism in this embodiment includes a separator base film 2 and a positive electrode side functional layer 1 and a negative electrode side functional layer 3 respectively coated on both sides of the separator base film 2 . The components of the positive electrode side functional layer 1 include a porous conductive carbon material, a dispersant, a binder, a surfactant, and a mixed solvent. Specifically, the porous conductive carbon material is conductive graphene oxide, and its addition amount is 20% of the total weight of the side functional layer 1; the dispersant is polyvinylpyrrolidone, and its addition is 5% of the total weight of the positive side functional layer 1; the binder is polyvinyl alcohol, and its addition is 5% of the positive side functional layer 1. 10% of the total weight of the functional layer 1; the surfactant is alkylphenol polyoxyethylene ether, and its addition amount is 5% of the total weight of th...

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Abstract

The invention discloses a lithium-sulfur diaphragm with a synergistic effect mechanism, a preparation method of the lithium-sulfur diaphragm and a lithium-sulfur battery, and belongs to the technicalfield of battery diaphragms. According to the invention, the porous conductive carbon material is added into the positive electrode side functional layer; a nano oxide material is added into the negative electrode side functional layer; the positive side and the negative side on the two sides of the diaphragm base membrane are coated with the functional layer slurry to prepare the lithium-sulfur diaphragm with a synergistic effect mechanism. The prepared lithium-sulfur diaphragm is applied to the lithium-sulfur battery, so that the shuttle effect caused by lithium polysulfide in the cycle process of the lithium-sulfur battery can be effectively inhibited, the deposition of lithium sulfide on the surface of an electrode can be reduced, lithium dendrites are prevented from piercing a pole piece, and the capacity retention ratio and the cycle effect of the lithium-sulfur battery are improved.

Description

technical field [0001] The invention belongs to the technical field of battery diaphragms, and more specifically relates to a lithium-sulfur diaphragm with a synergistic action mechanism, a preparation method thereof, and a lithium-sulfur battery. Background technique [0002] In recent years, more and more electric vehicles have entered people's daily life, and the state has also vigorously supported and promoted the marketization and application of electric vehicles. With the rapid development of the electric vehicle industry, lithium metal oxides (such as LiCoO 2 / LiNi x co y mn 1-x-y o 2 ) or lithium phosphate (such as lithium iron phosphate) as the positive electrode and graphite as the negative electrode, the traditional lithium-ion battery (LIBS) can no longer meet the requirements of high capacity and high specific energy for future power batteries. Therefore, the researchers turned their research direction to a new generation of battery material systems that ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/052
CPCH01M10/052H01M50/431H01M50/44H01M50/403H01M50/449Y02E60/10
Inventor 王娟张杰庞冲梁海燕穆红彦翟怀宇邓豪盖小厂
Owner 安徽金力新能源有限公司
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