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A kind of preparation method of flexible positive electrode of lithium-sulfur battery

A lithium-sulfur battery, flexible technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of reduced relative content of active materials, unsatisfactory battery rate performance, and limited battery energy density, etc., to achieve high porosity, good mechanical Performance, the effect of high mechanical strength

Active Publication Date: 2017-08-25
GUANGDONG MIC POWER NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Precise control is required for each process of traditional cathode material preparation, and the process is complex
The addition of inactive substances such as binders and conductive agents leads to a decrease in the relative content of active substances in the pole piece, which limits the energy density of the battery; the binder is non-conductive and is prone to failure during battery cycling, which will lead to poor battery rate performance. Not ideal, affecting the development of lithium-sulfur batteries

Method used

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  • A kind of preparation method of flexible positive electrode of lithium-sulfur battery
  • A kind of preparation method of flexible positive electrode of lithium-sulfur battery
  • A kind of preparation method of flexible positive electrode of lithium-sulfur battery

Examples

Experimental program
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Effect test

Embodiment 1

[0025]Get 7.3g of cetyltrimethylammonium bromide (CTAB) and 13.7g of ammonium persulfate (APS) and dissolve in the cooled 120mL hydrochloric acid solution (1mol / L), stir evenly under ice bath conditions for 40min, then slowly add 8.3 mL of pyrrole monomer was reacted at 0-5°C for 24 hours, the product was washed with deionized water and hydrochloric acid solution, and dried at 80°C to obtain polypyrrole fiber; take 2g of polypyrrole fiber and 6g of potassium hydroxide, and mix them uniformly in an inert atmosphere Under protection, the temperature was raised to 800°C at a heating rate of 5°C / min, and nitrogen-doped porous carbon fibers were obtained after holding for 3 hours; 0.5g of nitrogen-doped porous carbon fibers were uniformly mixed with 0.9g of elemental sulfur and 0.1g of elemental selenium by ball milling, and then Pour it into a closed stainless steel reaction kettle, raise the temperature to 260°C at a heating rate of 2°C / min, and heat it for 24 hours to obtain a ni...

Embodiment 2

[0036] Take 3.65g of cetyltrimethylammonium bromide (CTAB) and 6.85g of ammonium persulfate (APS) and dissolve them in a cooled 100mL hydrochloric acid solution (1mol / L), stir evenly under ice bath conditions for 40min, then slowly add 8.3 mL of pyrrole monomer was reacted at 0-5°C for 24 hours, the product was washed with deionized water and hydrochloric acid solution, and dried at 80°C to obtain polypyrrole fibers; take 1g of polypyrrole fibers and 3g of potassium hydroxide and mix them uniformly in an inert atmosphere Under protection, the temperature was raised to 1000°C at a heating rate of 5°C / min, and nitrogen-doped porous carbon fibers were obtained after holding for 3 hours; 0.5g of carbon fibers, 0.5g of elemental sulfur and 0.01g of elemental selenium were evenly mixed by ball milling, and then poured into a closed In a stainless steel reaction kettle, with a heating rate of 2°C / min, the temperature was raised to 260°C for heat treatment, and then kept for 24 hours t...

Embodiment 3

[0039] Get 7.3g of cetyltrimethylammonium bromide (CTAB) and 13.7g of ammonium persulfate (APS) and dissolve in the cooled 120mL hydrochloric acid solution (1mol / L), stir evenly under ice bath conditions for 40min, then slowly add 8.3 mL of pyrrole monomer was reacted at 0-5°C for 24 hours, the product was washed with deionized water and hydrochloric acid solution, and dried at 80°C to obtain polypyrrole fibers; take 1g of polypyrrole fibers and 3g of potassium hydroxide and mix them uniformly in an inert atmosphere Under protection, the temperature was raised to 1200°C at a heating rate of 5°C / min, and nitrogen-doped porous carbon fibers were obtained after holding for 2 hours; 0.5g of carbon fibers, 0.8g of elemental sulfur and 0.024g of elemental selenium were evenly ball-milled, and then poured into a closed In a stainless steel reaction kettle, with a heating rate of 2°C / min, the temperature was raised to 260°C for heat treatment, and then kept for 24 hours to obtain a nit...

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Abstract

The invention discloses a preparation method of a lithium-sulfur battery flexible positive electrode. The flexible positive electrode is formed by dispersing nitrogen-doped porous carbon fibers loaded with S<1-x>Sex among graphene sheet layers. The preparation method comprises the following steps: first compounding sulfur and selenium with nitrogen-doped porous carbon fibers to form a nitrogen-doped porous carbon fiber / S<1-x>Sex composite material, then adding the nitrogen-doped porous carbon fiber / S<1-x>Sex composite material into solvent, ultrasonically dispersing the solvent to obtain graphene and nitrogen-doped porous carbon fiber / S<1-x>Sex composite material composite suspension, vacuum suction filtering the composite suspension to obtain a filter cake, and drying the filter cake to obtain the flexible positive electrode of the graphene / nitrogen-doped porous carbon fiber / S<1-x>Sex composite material. The lithium-sulfur battery flexible positive electrode obtained by virtue of the preparation method has advantages of good conductivity, good sulfur and selenium fixing effect, high mechanical strength and the like. Meanwhile, the preparation method is simple, no complicated coating process is needed, no adhesive, conducting agent and current collector is needed, and the prepared flexible positive electrode is applied to a lithium-sulfur battery and has excellent electrochemical performance.

Description

technical field [0001] The invention relates to a method for preparing a flexible positive electrode of a lithium-sulfur battery, belonging to the field of lithium-sulfur batteries. Background technique [0002] The continuous growth of population, the gradual consumption of energy and the continuous deterioration of the environment make it extremely urgent to find efficient and clean energy storage devices. Among them, the high specific capacity and long service life of lithium batteries make them widely used in portable electronic devices and electric vehicle plug-in hybrid electric vehicles. However, at this stage, the improvement of the specific capacity of the positive electrode material of the lithium battery is limited, and the development of a battery system with high energy density has long been the general trend. Lithium-sulfur batteries have high specific capacity (1675mAh / g) and high energy density (2600Wh / kg), and the positive electrode material elemental sulfu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/1393
CPCH01M4/1393H01M4/362H01M4/5835Y02E60/10
Inventor 张治安张娟赵星星赖延清张凯
Owner GUANGDONG MIC POWER NEW ENERGY CO LTD
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