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Composite lithium-sulfur battery diaphragm, preparation method thereof and application

A lithium-sulfur battery, composite technology, applied in battery pack parts, separators/films/diaphragms/spacers, circuits, etc., can solve the problems of unsuitability for large-scale industrial production, poor stability, and high equipment requirements. Achieve the effect of improving cycle stability and Coulomb efficiency, improving Coulomb efficiency and cycle stability, and excellent electrochemical performance

Inactive Publication Date: 2018-05-01
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the blending method has a relatively limited scope of application due to the selection and compatibility of membrane materials, modifiers, and solvents; the coating method is generally combined with the base film through physical interactions, and the interaction is relatively small. Weak, easy to fall off from the surface of the membrane, poor stability; the surface grafting method overcomes the stability problem of the modified layer to a certain extent, but its process is relatively complicated and the equipment requirements are high, so it is not suitable for large-scale industrial production

Method used

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  • Composite lithium-sulfur battery diaphragm, preparation method thereof and application
  • Composite lithium-sulfur battery diaphragm, preparation method thereof and application
  • Composite lithium-sulfur battery diaphragm, preparation method thereof and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Example 1 A composite lithium-sulfur battery separator filled with PI non-woven fabric by PAMPS

[0046] 1. Preparation method

[0047] (1) Use 2-acrylamide-2-methylpropanesulfonic acid (AMPS) as the monomer containing acrylic group, N,N-methylenebisacrylamide (MBA) as the crosslinking agent, ammonium persulfate (APS) ) is a thermal initiator; AMPS (7.5g), MBA (3g) and APS (0.02g) are dissolved in 30mL deionized water, mixed to form a reaction precursor solution;

[0048] (2) Immerse the polyimide (PI) non-woven fabric into the prepared reaction precursor solution, take it out after 30 minutes and drain it for 5 minutes, and place it in an oven at 60°C for 6 hours to form a gel electrolyte-filled precursor After the membrane, it was taken out, and repeatedly washed with deionized water to remove the residual reaction solution, and finally dried in a vacuum oven at 40°C to obtain a PI non-woven membrane filled with PAMPS.

[0049] 2. Product nature and characteristics ...

Embodiment 2

[0059] Example 2 A composite lithium-sulfur battery separator filled with PI non-woven fabric by PAMPS

[0060] 1. Preparation method

[0061] (1) 2-acrylamide-2-methylpropanesulfonic acid (AMPS) is used as acryl-containing monomer, N,N-methylenebisacrylamide (MBA) is used as a crosslinking agent, and benzophenone ( BP) is photoinitiator; AMPS (15g), MBA (3g) and BP (0.03g) are dissolved in the N'N-dimethylacetamide of 50mL, mix and form reaction precursor solution;

[0062] (2) Immerse the polyimide (PI) non-woven fabric into the prepared reaction precursor solution, take it out after 1.5 hours and drain it for 6 minutes, and then place it under ultraviolet light to initiate the reaction for 10 minutes to form a gel electrolyte filled front After the body membrane, it was taken out, washed repeatedly with ethanol and deionized water to remove the residual reaction solution, and dried in a vacuum oven at 60°C to obtain a PI non-woven membrane filled with PAMPS.

[0063] 2. P...

Embodiment 3

[0066] Example 3 A composite lithium-sulfur battery separator filled with PI flat porous membrane by PAMPS

[0067] 1. Preparation method

[0068] (1) Use 2-acrylamide-2-methylpropanesulfonic acid (AMPS) as the monomer containing propylene group, polyethylene glycol (PEG) as the cross-linking agent, and azobisisobutyronitrile (ABIN) as the heat Initiator: AMPS (10g), PEG (1.5g) and ABIN (0.015g) were dissolved in 50mL of N'N-dimethylformamide, mixed uniformly to form a reaction precursor solution;

[0069] (2) Immerse the polyimide (PI) flat porous membrane into the prepared reaction precursor solution, take it out after 1 hour and drain it for 4 minutes, and then place it in an oven at 60°C for 8 hours to form a gel electrolyte filled front After the body membrane was removed, it was washed repeatedly with ethanol and deionized water to remove the residual reaction solution, and dried in a vacuum oven at 40°C to obtain a PI diaphragm filled with PAMPS.

[0070] 2. Product n...

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Abstract

The invention discloses composite lithium-sulfur battery diaphragm, a preparation method thereof and application. The method comprises the steps of impregnating porous substrate membrane into reactionprecursor solution composed of reaction monomers, cross-linking agent, initiator and solvent; and carrying out in situ polymerization and cross-linking reaction under certain condition, thereby acquiring gel electrolyte filled composite lithium-sulfur battery diaphragm with nanoscale pore diameters. According to the lithium-sulfur battery diaphragm, the porous substrate membrane is taken as a framework material, so the good mechanical property and excellent thermal dimension stability are endowed to the diaphragm; the filled gel electrolyte has a great number of lithium conduction functionalgroups, so channels for lithium ions to shuttle are provided, and the problem that the ionic conductivity is relatively low due to reduction of the pore diameters of the diaphragm is avoided; and according to the prepared nanoscale pore diameter composite diaphragm, migration of polysulfide can be inhibited through physical range limitation and chemical absorption effect, so the coulombic efficiency and cycling stability of the lithium-sulfur battery are improved. The composite lithium-sulfur battery diaphragm, the preparation method thereof and the application are simple in technology and high in practicability, are easy to popularize and are beneficial for accelerating industrial application of a lithium-sulfur battery.

Description

technical field [0001] The invention belongs to the technical field of battery materials. More specifically, it relates to a composite lithium-sulfur battery separator and its preparation method and application. Background technique [0002] Lithium-sulfur batteries use elemental sulfur with high specific capacity as the positive electrode material, and its theoretical energy density can reach 2600Wh·kg -1 At the same time, elemental sulfur also has the advantages of large natural abundance, low cost, and environmental friendliness. Therefore, lithium-sulfur batteries are considered to be a new type of battery system with great development prospects and research value. However, limited by its complex reaction mechanism, the commercial application of lithium-sulfur batteries still faces many difficulties, mainly including: poor conductivity of active materials, intermediate product polysulfides are easily soluble in electrolyte and cause shuttle effect, sulfur Electrode vol...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/409
CPCH01M50/431H01M50/44H01M50/403H01M50/409H01M50/411Y02E60/10
Inventor 张宏余丁山李靖胡轩赫
Owner SUN YAT SEN UNIV
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