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Positive electrode material for lithium-sulfur battery and preparation method for positive electrode material

A cathode material, a technology for lithium-sulfur batteries, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as the inability to effectively inhibit lithium polysulfide dissolution from lithium polysulfide flying shuttle effect, etc., to improve capacity and cycle times, preparation The method is simple and the effect of suppressing the shuttle

Active Publication Date: 2016-09-21
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it cannot effectively inhibit the dissolution of lithium polysulfide and the shuttle effect of lithium polysulfide

Method used

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  • Positive electrode material for lithium-sulfur battery and preparation method for positive electrode material
  • Positive electrode material for lithium-sulfur battery and preparation method for positive electrode material
  • Positive electrode material for lithium-sulfur battery and preparation method for positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] (1) Dissolve 0.5g of polyacrylonitrile (PAN, Mw=150,000) and 0.5g of polyvinylpyrrolidone (PVP, Mw=1,300,000) in 10ml of dimethylformamide (DMF), and stir at 60°C for 12h to obtain spinning Silk liquid, transfer it into a syringe, place it on the syringe pump, and place a piece of conductive carbon 18 cm opposite to serve as the electrospinning receiver. Connect the high voltage power supply to the syringe needle and the ground wire to the conductive carbon. Apply high voltage of 15kV, the flow rate of the syringe pump is 0.3ml h -1 , After collecting for 4 hours, a polyacrylonitrile / polyvinylpyrrolidone / dimethylformamide composite fiber film was obtained.

[0056] (2) The composite fiber film obtained in step (1) is placed in a muffle furnace, and calcined at 300° C. for 4 hours, and the heating rate is 5-10° C. / min. The polyvinylpyrrolidone shell will be burned away, leaving an oxidized free-standing polyacrylonitrile oxide film.

[0057] (3) Place the independentl...

Embodiment 2

[0062] Using the same preparation process as in Example 1, the only difference is that in step (5), under argon protection, 12.5 μl of 5mol / L Li 2 S 8 - The DOL / DME solution was dropped onto the substrate and dried under argon to obtain a S loading of 2 mg / cm 2 positive electrode material.

[0063] The positive electrode material prepared in this example is the positive electrode of a lithium-sulfur battery, and the lithium-sulfur battery is assembled with reference to the raw materials and processes in Example 1. For performance, see image 3 and Figure 4 .

Embodiment 3

[0065] (1) Dissolve 0.9g of polyacrylonitrile (PAN, Mw=150,000) and 0.1g of polyvinylpyrrolidone (PVP, Mw=1,300,000) in 10ml of dimethylformamide (DMF), and stir at 60°C for 12h to obtain spinning Silk liquid, transfer it into a syringe, place it on the syringe pump, and place a piece of conductive carbon 20 cm opposite to serve as the electrospinning receiver. Connect the high voltage power supply to the syringe needle and the ground wire to the conductive carbon. Apply 25kV high voltage, the flow rate of the syringe pump is 1.0ml h -1 , After collecting for 4 hours, a polyacrylonitrile / polyvinylpyrrolidone / dimethylformamide composite fiber film was obtained.

[0066] (2) The composite fiber film obtained in step (1) is placed in a muffle furnace, and calcined at 320° C. for 2 hours, and the heating rate is 5-10° C. / min. The polyvinylpyrrolidone shell will be burned away, leaving an oxidized free-standing polyacrylonitrile oxide film.

[0067] (3) Place the independently f...

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Abstract

The invention discloses a positive electrode material for a lithium-sulfur battery. The positive electrode material comprises a carrier and active ingredients, wherein the carrier is a conductive carbon material, and a non-conductive halogen compound is loaded on the surface of the conductive carbon material. The invention also discloses a preparation method for the positive electrode material; the preparation method comprises the steps of mixing the halogen compound with a solvent A until the mixture is thick; blowing the mixture to the surface of the conductive carbon surface at a temperature of 100-200 DEG C under an inert gas to load the halogen compound on the surface of the conductive carbon material, and recording the product as the substrate; and enabling the active ingredients to be mixed with a solvent B to obtain a solution, adding the solution to the substrate in a dropwise manner, and drying to obtain the positive electrode material for the lithium-sulfur battery. The invention provides the positive electrode material for the lithium-sulfur battery; the conductive carbon material is compounded with the non-conductive halogen compound to be used as the carrier of the active ingredients, so that the dissolution of the lithium sulfide and the shuttle flying among the lithium-sulfur electrodes can be effectively restrained; and the capacity of the lithium-sulfur battery and the cycling times can be greatly increased.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a positive electrode material for lithium-sulfur batteries and a preparation method thereof. Background technique [0002] Lithium batteries are widely used in smartphones, unmanned aerial vehicles, and hybrid electric vehicles. However, with the development of society, traditional lithium-ion batteries have been difficult to meet the demand. Elemental sulfur has a high volumetric energy density (2.8kWh L -1 ) and mass energy density (2.5kWh kg -1 ), and is abundant in nature, and the price is low. A lithium-sulfur battery with lithium metal as the negative electrode and sulfur as the positive electrode has a high theoretical capacity (1675mAh g -1 ), is an ideal next-generation secondary battery. [0003] In lithium-sulfur batteries, since sulfur and its reduced products are electron and ion insulators, it is difficult for electrons and ions to transport at the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/58H01M4/62H01M10/0525
CPCH01M4/38H01M4/5815H01M4/625H01M10/0525Y02E60/10
Inventor 陆盈盈
Owner ZHEJIANG UNIV
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