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Simple construction method of nano carbon shell loaded molybdenum-based heterojunction and application of nano carbon shell loaded molybdenum-based heterojunction in lithium-sulfur battery

A lithium-sulfur battery and nano-carbon technology, applied in the field of electrochemistry, can solve the problems of lack of in-depth research on catalysis, reduce the cost of lithium-sulfur batteries, and reduce the use of precious metal catalysts, so as to improve electrochemical performance, improve cycle, and improve adsorption. effect of ability

Active Publication Date: 2021-07-13
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the catalytic effect of molybdenum-based catalysts on polysulfide compounds has not been studied in depth. If a new type of molybdenum-based heterojunction with both adsorption and catalysis for polysulfide compounds can be synthesized, not only good performance of lithium-sulfur batteries can be obtained, but also can be greatly reduced. The use of noble metal catalysts reduces the cost of lithium-sulfur batteries

Method used

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  • Simple construction method of nano carbon shell loaded molybdenum-based heterojunction and application of nano carbon shell loaded molybdenum-based heterojunction in lithium-sulfur battery
  • Simple construction method of nano carbon shell loaded molybdenum-based heterojunction and application of nano carbon shell loaded molybdenum-based heterojunction in lithium-sulfur battery
  • Simple construction method of nano carbon shell loaded molybdenum-based heterojunction and application of nano carbon shell loaded molybdenum-based heterojunction in lithium-sulfur battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0046] (1) Nanocarbon shells were prepared by a template-free method.

[0047] Sodium citrate was dried in an oven at 140 °C for 12 h, ball milled for 6 h, and then the powder sample was transferred to a quartz boat and annealed at 700 °C for 1 h under an argon atmosphere with a heating rate of 5 °C / min. The resulting product was stirred in 2M HCl solution for 2 h and washed with copious amounts of deionized water. Dry at 60°C overnight to obtain the nano-carbon shell product;

[0048] (2) Molybdenum disulfide / carbon shell material was prepared by hydrothermal method.

[0049] 50 mg of carbon shells were dispersed in 50 mL of deionized water and sonicated for 2 h, then 0.5 g of sodium molybdate dihydrate and 1 g of thiourea were added and stirred for 0.5 h. The solution was placed in a 100mL autoclave, sealed and heated at 200°C for 16h. The prepared solid product was washed with deionized water and dried in a vacuum oven at 60°C for 6 hours to obtain a molybdenum disulfide...

Embodiment example 2

[0060] (1) Nanocarbon shells were prepared by a template-free method.

[0061] Sodium citrate was dried in an oven at 160°C for 24h, ball milled for 12h, and then the powder sample was transferred to a quartz boat, annealed at 900°C for 3h under an argon atmosphere, and the heating rate was 5°C / min. The obtained product was stirred in 4M HCl solution for 6 h, washed with plenty of deionized water. Dry at 80°C overnight to obtain the nano-carbon shell product;

[0062] (2) Molybdenum disulfide / carbon shell material was prepared by hydrothermal method.

[0063] 150 mg of carbon shells were dispersed in 80 mL of deionized water and sonicated for 4 h, then 1.0 g of sodium molybdate dihydrate and 2 g of thiourea were added and stirred for 1 h. The solution was placed in a 100mL autoclave, sealed and heated at 200°C for 24h. The prepared solid product was washed with deionized water and dried in a vacuum oven at 60°C for 12 hours to obtain a molybdenum disulfide / carbon shell mate...

Embodiment example 3

[0074] (1) Nanocarbon shells were prepared by a template-free method.

[0075] Sodium citrate was dried in an oven at 150 °C for 20 h, ball milled for 9 h, and then the powder sample was transferred to a quartz boat, and annealed at 800 °C for 2 h under an argon atmosphere with a heating rate of 5 °C / min. The resulting product was stirred in 3M HCl solution for 4 h and washed with plenty of deionized water. Dry at 70°C overnight to obtain the nano-carbon shell product;

[0076] (2) Molybdenum disulfide / carbon shell material was prepared by hydrothermal method.

[0077] 100 mg of carbon shells were dispersed in 65 mL of deionized water and sonicated for 3 h, then 0.75 g of sodium molybdate dihydrate and 1.5 g of thiourea were added and stirred for 0.75 h. The solution was placed in a 100mL autoclave, sealed and heated at 200°C for 20h. The prepared solid product was washed with deionized water and dried in a vacuum oven at 70°C for 9 hours to obtain a molybdenum disulfide / ca...

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Abstract

The invention discloses a simple construction method of a nano carbon shell loaded molybdenum-based heterojunction and application of the nano carbon shell loaded molybdenum-based heterojunction in a lithium-sulfur battery, and belongs to the field of lithium-sulfur batteries. The molybdenum-based heterojunction coupled nano carbon shell is used as a diaphragm modification material. The molybdenum disulfide / carbon shell material is treated with low-concentration hydrogen peroxide under mild conditions, and molybdenum trioxide heterojunction is generated on the surface of molybdenum disulfide to obtain the molybdenum disulfide-molybdenum trioxide / carbon shell modified diaphragm. The reaction conditions are mild, the preparation method is simple, the obtained product has obvious structural advantages, the two-dimensional heterostructure can accelerate transmission of electrons and ions to provide a large number of catalytic sites, and the two-dimensional heterostructure has strong polarity and can improve the adsorption capacity of polysulfide, so that the electrochemical performance is improved; and in addition, a high-conductivity carbon shell is introduced into the synthesized material, so that electron transmission of the synthesized material can be further increased, and polysulfide conversion is accelerated.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and relates to a lithium-sulfur battery diaphragm modified by a molybdenum-based heterojunction material loaded on a carbon shell, in particular to a lithium-sulfur battery diaphragm modified by a heterojunction material loaded with molybdenum disulfide and molybdenum trioxide on a nano-carbon shell , to achieve the adsorption capture and catalytic conversion of polysulfide compounds. Background technique [0002] The growth in demand for mobile devices and electric vehicles has given a major boost to the development of advanced rechargeable batteries in recent years. Lithium-sulfur batteries (Li-S) due to their high theoretical capacity (1672mAh g -1 ) and low sulfur cost, has become one of the most promising candidate energy storage devices at present. However, technical difficulties such as low sulfur utilization, "shuttle effect" of soluble polysulfides, irreversible cathode structure during...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M4/13H01M4/485H01M4/58H01M4/62H01M10/052
CPCH01M4/485H01M4/5815H01M4/625H01M10/052H01M4/13H01M4/139Y02E60/10
Inventor 张凤祥雷达张旭李永鹏邓小昱
Owner DALIAN UNIV OF TECH
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