Preparation method of conjugated microporous polyaniline modified battery current collector and application of conjugated microporous polyaniline modified battery current collector in lithium-sulfur battery

A technology of conjugated microporous and polyaniline, applied in the application of lithium-sulfur batteries, the field of preparation of conjugated microporous polyaniline modified battery current collectors, can solve the problem that the stability of conductive polymers needs to be further improved, and the polarity cannot be improved. The strong chemical adsorption energy of lithium polysulfide and the irregular pore size distribution of conductive polymers have achieved the effects of facilitating ion/electron transfer, inhibiting the shuttle effect, and hindering the shuttle effect

Pending Publication Date: 2022-04-12
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First, common conductive polymers can only slow down the diffusion of lithium polysulfides or adsorb soluble lithium polysulfides in the first few cycles, but it is difficult to maintain long-term cycles.
The main reason is that conventional conductive polymers lack polar groups and cannot produce strong chemical adsorption energy for polar lithium polysulfides.
Secondly, the stability of conductive polymers needs to be further improved
Most importantly, conductive polymers have irregular pore size distribution, low specific surface area, and weak physical adsorption capacity, which limits the sulfur content.

Method used

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  • Preparation method of conjugated microporous polyaniline modified battery current collector and application of conjugated microporous polyaniline modified battery current collector in lithium-sulfur battery
  • Preparation method of conjugated microporous polyaniline modified battery current collector and application of conjugated microporous polyaniline modified battery current collector in lithium-sulfur battery
  • Preparation method of conjugated microporous polyaniline modified battery current collector and application of conjugated microporous polyaniline modified battery current collector in lithium-sulfur battery

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Embodiment approach

[0031] It should be noted that the present invention evaluates the performance of the prepared modified current collector through the stability, cycle life and change of sulfur loading of the lithium-sulfur battery. The specific method is as follows:

[0032] For the conductive polyaniline functional layer of the lithium-sulfur battery current collector, the positive electrode reaction of the lithium-sulfur battery is optimized through a simple commercial electrode modification method, so as to achieve the effect of improving the overall performance of the lithium-sulfur battery.

[0033] The current collector with conjugated microporous polyaniline modified coating prepared by the present invention can realize the function of adsorbing polysulfides to suppress the shuttle effect and buffer and protect the structure of the current collector, and can also ensure efficient electron transmission from the external circuit ; When applied to lithium-sulfur batteries, the current col...

Embodiment 1

[0051] Step 1: Dissolve 0.5g of tris(4-bromoaniline) and 0.5g of p-phenylenediamine in 30mL of anhydrous tetrahydrofuran solution, heat and stir at 60°C for 1.5h to form a solution to be reacted;

[0052] Step 2, add sodium persulfate (0.3g), XPhos (0.045g), Pd(dba) to step 1 gained solution to be reacted 2 (0.045g), NaOtBu (3.5g) and NaF (0.5g) and insert nitrogen, vacuumize, stir at 65°C for 48h, and carry out the polymerization reaction of polyaniline;

[0053] Step 3, after the polymerization reaction in step 2 is completed, the product is washed with 200mL CHCl 3 , ethanol, methanol and boiling water to remove catalysts, impurities and oligomers, and then Soxhlet extraction with methanol for 24 hours, tetrahydrofuran for 24 hours and chloroform for 24 hours, then vacuum dried at 60°C for 48 hours, and triturated to obtain micro Porous polyaniline powder (CMPA, Conjugatedmicroporous polyaniline), hereinafter all use CMPA to refer to the synthesized microporous polyaniline...

Embodiment 2

[0064] Step 1: Dissolve 0.5g of tris(4-bromoaniline) and 0.5g of p-phenylenediamine in 30mL of anhydrous tetrahydrofuran solution, heat and stir at 60°C for 1.5h to form a solution to be reacted;

[0065] Step 2, add sodium persulfate (0.5g), XPhos (0.08g), Pd(dba) to step 1 gained solution to be reacted 2 (0.08g), NaOtBu (4g) and NaF (0.5g) and insert nitrogen, vacuumize, stir at 50°C for 48h, and carry out the polymerization reaction of polyaniline;

[0066] Step 3, after the polymerization reaction in step 2 is completed, the product is washed with 200mL CHCl 3 , ethanol, methanol, and boiling water to remove catalysts, impurities, and oligomers, then Soxhlet extraction with methanol for 24 hours, THF for 24 hours, and chloroform for 24 hours for 72 hours, then vacuum-dried at 60°C for 48 hours, and triturated to obtain micro Porous polyaniline powder (CMPA, Conjugatedmicroporous polyaniline), hereinafter all use CMPA to refer to the synthesized microporous polyaniline;

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Abstract

The invention relates to a preparation method of a conjugated microporous polyaniline modified battery current collector and an application of the conjugated microporous polyaniline modified battery current collector in a lithium-sulfur battery, and the preparation method comprises the following steps: adding tris (4-bromoaniline) and a linker into a solvent in a nitrogen atmosphere, and uniformly stirring to prepare a to-be-reacted solution; adding an oxidizing agent, a catalyst and NaF into the solution to be reacted, and reacting to obtain conjugated microporous polyaniline powder; the preparation method comprises the following steps: mixing conjugated microporous polyaniline powder with a binder, and carrying out ball milling to form current collector modified slurry; and brushing the current collector modified slurry onto the surface of a battery current collector, and drying to obtain the conjugated microporous polyaniline modified current collector. According to the invention, the functions of adsorbing polysulfide, inhibiting a shuttle effect and buffering and protecting the structure of the current collector are realized, and efficient transmission of electrons from an external circuit can also be ensured; when the current collector with the polyaniline modified coating is applied to a lithium-sulfur battery, the current collector with the polyaniline modified coating can effectively improve the cycling stability of the battery and shows a long service life of the battery.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and relates to a preparation method of a conjugated microporous polyaniline modified battery current collector and its application in lithium-sulfur batteries. Background technique [0002] With the rapid development of portable electronic devices, electric vehicles, and smart grids, the development of advanced electrochemical energy storage systems with high energy / power density and long lifetime has received great attention as a key transformative technology to achieve sustainable energy supply. Lithium-sulfur batteries have a very high theoretical capacity (1675mAh g -1 ), sulfur’s natural abundance, low toxicity, and low cost have been widely studied and applied, arousing strong interest. Despite such promising prospects, lithium-sulfur batteries still have some problems in practical application. Among them, the shuttling effect of polysulfides (LiPSs) is the most concerned techni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M10/052C08G73/02
Inventor 延卫王嘉楠陈信马千越孙世翼
Owner XI AN JIAOTONG UNIV
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