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Preparation method for self-supporting porous electrode, and self-supporting porous electrode and application thereof

A porous electrode, self-supporting technology, applied in the direction of electrode manufacturing, battery electrodes, non-aqueous electrolyte storage batteries, etc., can solve the problems of hindered ion and electron transmission, difficult to make electrodes, poor capacity, etc., and achieve controllable electrode thickness , Improve energy density, wide application range

Active Publication Date: 2018-03-27
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As far as it is concerned, on the one hand, it is difficult to obtain 10mg cm -2 The electrode with the above load; on the other hand, in the denser structure, the ion and electron transmission is hindered, and the capacity is not good.

Method used

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  • Preparation method for self-supporting porous electrode, and self-supporting porous electrode and application thereof
  • Preparation method for self-supporting porous electrode, and self-supporting porous electrode and application thereof
  • Preparation method for self-supporting porous electrode, and self-supporting porous electrode and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Dissolve 0.8g PVDF-HFP in 17g N-methylpyrrolidone (NMP), stir until completely dissolved, add 0.4g KB600, stir for 10min, then add 2.8g steam-activated KB600 carbon powder and sulfur complex (S / A-KB600), stir for 5 hours to make it a uniform slurry, adjust the scraper to 0μm, scrape and coat the glass plate with grooves (groove depth: 300μm, diameter: 14mm) repeatedly for 3 times, and wait for the groove to be filled After the slurry is filled, put the glass plate in water. After the slurry disk is separated from the glass plate, it is quenched with liquid nitrogen, and placed in a freeze dryer for 12 hours, dried overnight at 70°C, and weighed at 60 ℃ vacuum drying for 24h. Subsequent battery assembly and testing were the same as in Comparative Example 1.

[0054] Under 0.1C rate, the first discharge specific capacity is 1201mA h g -1 , the specific capacity was maintained at 900mA hg after 50 cycles -1 , the capacity retention rate is 75.0%; when the rate is incre...

Embodiment 2

[0056] Dissolve 0.8g of PVDF-HFP in 17g of N-methylpyrrolidone (NMP), stir until completely dissolved, add 0.4g of MWCNTs (diameter: 8-15nm, length: 20-30μm), stir for 10min, then add 2.8g of S / A -KB600, stir for 5 hours to make it a uniform slurry. Subsequent electrode preparation, battery assembly and testing are the same as in Example 1.

[0057] Under 0.1C rate, the first discharge specific capacity is 1199mA h g -1 , the specific capacity was maintained at 833mA hg after 50 cycles -1 , the capacity retention rate is 73.6%; when the rate is increased to 1C, the discharge specific capacity is 779mA h g -1 .

Embodiment 3

[0059] Dissolve 0.8g of PAN in 17g of N-methylpyrrolidone (NMP), stir until completely dissolved, add 0.4g of KB600, stir for 10min, then add 2.8g of S / A-KB600, stir for 5h to make a uniform slurry. Subsequent electrode preparation, battery assembly and testing are the same as in Example 1.

[0060] Under 0.1C rate, the first discharge specific capacity is 1186mA h g -1 , the specific capacity was maintained at 1058mA hg after 50 cycles -1 , the capacity retention rate is 89.2%; when the rate is increased to 1C, the discharge specific capacity is 699mA h g -1 .

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Abstract

The invention relates to a preparation method for a self-supporting porous electrode, and the self-supporting porous electrode. The preparation method comprises the following steps: mixing organic polymer resin, a conductive agent and a carbon-sulfur compound in an organic solvent, scraping the obtained mixture onto a notched substrate, preparing an electrode blank by using an immersion phase inversion method, separating the electrode blank from the substrate, and subjecting the electrode blank to washing and freeze drying so as to prepare the self-supporting porous electrode. The flexible porous electrode is simple and environment-friendly to prepare, controllable in thickness, adjustable in pore size and porosity, wide in application scope, and capable of maximally reducing material waste in shearing and flaking and breaking requirements of traditional flexible self-supporting electrodes on material dimensions (i.e., 1D and 2D).

Description

technical field [0001] The invention relates to a porous electrode and a preparation method thereof, in particular to a porous electrode for a lithium-sulfur battery. Background technique [0002] The flexible design of lithium-sulfur secondary batteries has received extensive attention from the academic community in recent years. This kind of battery adopts a simple self-supporting negative electrode-electrolyte and separator layer-self-supporting positive electrode sandwich structure design. Due to the omission of current collectors, steel shells and a large amount of perfused organic electrolyte, the specific energy density and safety of the battery are improved. It has been greatly improved and the application field has become wider. Among them, the flexibility, electronic and ionic conductivity of the self-supporting cathode determine the comprehensive performance of the flexible battery. However, the existing flexible self-supporting electrodes are basically research...

Claims

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Application Information

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IPC IPC(8): H01M4/139H01M4/04H01M4/13H01M10/052
CPCH01M4/0402H01M4/13H01M4/139H01M10/052Y02E60/10
Inventor 张洪章张华民李先锋杨晓飞
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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