Lithium sulfur battery positive electrode material and preparation method thereof

A positive electrode material, lithium-sulfur battery technology, applied in the field of material chemistry, can solve the problems of low sulfur loading, obvious shuttle effect, poor cycle stability, etc., and achieve the effects of low density, reduced dissolution, and strong electrical conductivity

Active Publication Date: 2019-05-14
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

[0004] 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 lithium-sulfur battery positive electrode materials, and provides a lithium-sulfur battery positive electrode material and a preparation method thereof

Method used

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  • Lithium sulfur battery positive electrode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] (1) Preparation of metal organic framework material MIL-125:

[0028] First measure 30mL of N,N-dimethylformamide and 8mL of methanol, mix well, take 3g of phthalic acid and dissolve it in the mixed solvent, ultrasonicate for 40 minutes, add 8mL of tetrabutyl titanate, ultrasonicate for 60 minutes, and then The solution was placed in a polytetrafluoroethylene-lined reactor and reacted at 130°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.

[0029] (2) Preparation of tricobalt tetroxide / titanium dioxide / carbon composite material:

[0030] Dissolve 3 g of cobalt acetate in 60 mL of deionized water, take 0.6 g of the metal-organic framework material MIL-125 prepared in step (...

Embodiment 2

[0036] (1) Preparation of metal organic framework material MIL-125:

[0037] First measure 50mL of N,N-dimethylformamide and 10mL of methanol, mix well, take 5g of phthalic acid and dissolve it in the mixed solvent, ultrasonicate for 60 minutes, add 10mL of tetrabutyl titanate, ultrasonicate for 60 minutes, and then The solution was placed in a polytetrafluoroethylene-lined reactor and reacted at 150°C for 48h. 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 80°C for 24 hours to obtain the metal-organic framework material MIL-125.

[0038] (2) Preparation of tricobalt tetroxide / titanium dioxide / carbon composite material:

[0039] Dissolve 5 g of cobalt acetate in 80 mL of deionized water, take 1 g of the metal organic framework material MIL-125 prepared in step (1)...

Embodiment 3

[0043] (1) Preparation of metal organic framework material MIL-125:

[0044] 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.

[0045] (2) Preparation of tricobalt tetroxide / titanium dioxide / carbon composite material:

[0046] Dissolve 2 g of cobalt acetate in 50 mL of deionized water, take 0.5 g of the metal-organic framework material MIL-125 prepared in step (1) and place...

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Abstract

The invention relates to a lithium sulfur battery positive electrode material and a preparation method thereof. The method comprises the steps of preparing a mixed solution of N, N-dimethylformamide,methyl alcohol and phthalic acid, adding tetrabutyl titanate by ultrasonic dispersion, placing in a reaction kettle with a polytetrafluoroethylene lining, and performing reaction under 120-150 DEG C to prepare a metal organic framework material MIL-125(Ti); placing the MIL-125(Ti) in a cobalt acetate solution, performing high-temperature calcination under an argon atmosphere to obtain Co3O4/TiO2/Ccomposite material after centrifugal separation; and performing thermal processing under nitrogen protection to obtain S-Co3O4/TiO2/C composite material after ball-milling and mixing with pure-phasenanometer sulfur powder. By the material, Co3O4/TiO2/C is organically combined, and a shuttle effect of a polysulfide can be limited by absorption of carbon material pores; and the dissolving of an intermediate product is prevented by an absorption effect and a catalytic effect, the electrochemical reaction speed of an active material absorbed onto a carrier surface is improved, and the capacity and the cycle property of Li-S battery are improved.

Description

technical field [0001] The invention relates to a positive electrode material for a lithium-sulfur battery and a preparation method thereof, in particular to a preparation method of a sulfur-cobalt tetroxide / titanium dioxide / carbon composite lithium-sulfur battery positive electrode material, belonging to the field of material chemistry. Background technique [0002] According to statistics, China is currently the second largest energy producer and consumer in the world. The total amount of energy resources is relatively abundant, but the per capita possession of energy resources is relatively low, and the distribution of storage is uneven, making development difficult. With the rapid development of the economy and the rapid increase of energy consumption, human beings are facing a series of problems such as the depletion of resources, serious environmental pollution, frequent extreme weather, and serious damage to the ecosystem. These problems make us urgently need renewable...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCY02E60/10
Inventor 王新王加义
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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