A kind of sodium-sulfur battery cathode material and preparation method thereof

A technology for sodium-sulfur batteries and cathode materials, applied in the field of material chemistry, can solve the problems of poor cycle stability, obvious shuttle effect, and low sulfur loading, and achieve the effects of strong electrical conductivity, shortened transmission path, and excellent electrical conductivity.

Active Publication Date: 2021-03-16
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the problems of low sulfur loading capacity, obvious shuttle effect, poor cycle stability and the like existing in the existing sodium-sulfur battery positive electrode materials, and provides a sodium-sulfur battery positive electrode material and a preparation method thereof

Method used

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  • A kind of sodium-sulfur battery cathode material and preparation method thereof

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Effect test

Embodiment 1

[0025] (1) Preparation of metal organic framework material MIL-125:

[0026] First measure 30mL of N,N-dimethylformamide and 6mL of methanol, mix well, take 3g of phthalic acid and dissolve it in the mixed solvent, sonicate for 60 minutes, add 6mL of tetrabutyl titanate, sonicate for 60 minutes, then mix the above The solution was placed in a polytetrafluoroethylene-lined reactor and reacted at 140°C for 24h. After the reaction was completed, the product was cooled to room temperature with the furnace, and the product was collected by centrifugation, washed repeatedly with deionized water three times, and finally the washed product was placed in a vacuum drying oven at 60°C for 12 hours to obtain the metal-organic framework material MIL-125.

[0027] (2) Preparation of titanium dioxide-carbon composite materials:

[0028] Take 1.5 g of metal-organic framework material MIL-125 prepared in step (1), put it in 60 mL of graphene aqueous solution, the concentration of graphene aqu...

Embodiment 2

[0033] (1) Preparation of metal organic framework material MIL-125:

[0034] First measure 20mL of N,N-dimethylformamide and 5mL of methanol, mix well, take 2g of phthalic acid and dissolve it in the mixed solvent, sonicate for 30 minutes, add 5mL of tetrabutyl titanate, sonicate for 30 minutes, then mix the above The solution was placed in a polytetrafluoroethylene-lined reactor at 120°C for 24h. After the reaction was completed, the product was cooled to room temperature with the furnace, and the product was collected by centrifugation, washed repeatedly with deionized water three times, and finally the washed product was placed in a vacuum drying oven at 50°C for 12 hours to obtain the metal-organic framework material MIL-125.

[0035] (2) Preparation of titanium dioxide-carbon composite materials:

[0036] Take the metal-organic framework material MIL-1251g prepared in step (1), put it in 50 mL graphene aqueous solution, the concentration of the graphene aqueous solution ...

Embodiment 3

[0040] (1) Preparation of metal organic framework material MIL-125:

[0041] First measure 20mL of N,N-dimethylformamide and 5mL of methanol, mix well, take 2g of phthalic acid and dissolve it in the mixed solvent, sonicate for 30 minutes, add 5mL of tetrabutyl titanate, sonicate for 30 minutes, then mix the above The solution was placed in a polytetrafluoroethylene-lined reactor at 120°C for 24h. After the reaction was completed, the product was cooled to room temperature with the furnace, and the product was collected by centrifugation, washed repeatedly with deionized water three times, and finally the washed product was placed in a vacuum drying oven at 50°C for 12 hours to obtain the metal-organic framework material MIL-125.

[0042] (2) Preparation of titanium dioxide-carbon composite materials:

[0043] Take the metal-organic framework material MIL-1252g prepared in step (1), put it in 100 mL graphene aqueous solution, the concentration of graphene aqueous solution is ...

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Abstract

The invention relates to a sodium-sulfur battery positive electrode material and a preparation method thereof. The sodium-sulfur battery positive electrode material is a sulfur-titanium dioxide-carboncomposite material, and the preparation method includes the following steps: firstly, preparing a metal organic framework material MIL-125, spray-drying and compounding the metal organic framework material MIL-125 with graphene, performing carbonization treatment to obtain a titanium dioxide-carbon composite material, and then doping sulfur to prepare a sulfur-titanium dioxide-carbon composite sodium-sulfur battery positive electrode material by using a ball milling method and a hot melting method. The composite material prepared by using the method has a larger specific surface area and porosity, can limit the 'shuttle effect' of polysulfide, reduces the dissolution of intermediate products, can improve the electrochemical activity of elemental sulfur, shortens the transmission paths ofelectrons and ions, limits the dissolution of polysulfide, and improves the electrochemical reaction speed of active materials adsorbed on the surface of a carrier.

Description

technical field [0001] The invention relates to a positive electrode material for a sodium-sulfur battery and a preparation method thereof, in particular to a sulfur-titanium dioxide-carbon composite sodium-sulfur battery positive electrode material and a method thereof, belonging to the field of material chemistry. Background technique [0002] In recent years, new energy power generation technology has developed rapidly, and the industrial scale, economy and marketization process have been improved year by year. However, the instability and unsustainability of wind and solar power generation have put forward new requirements for large-scale energy storage technology. Among the various energy storage technologies currently in use, sodium-sulfur batteries have gradually attracted the attention of researchers from various countries due to their superior performance. Sodium-sulfur batteries have many unique features that are difficult to compare with other batteries: (1) High ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/05
CPCY02E60/10
Inventor 王新王加义
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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