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Nitrogen-rich hollow carbon sphere/sulfur composite positive electrode material for lithium-sulfur battery and preparation method of nitrogen-rich hollow carbon sphere/sulfur composite positive electrode material

A composite positive electrode material, lithium-sulfur battery technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of capacity attenuation, low Coulombic efficiency, etc., and achieve the effects of improved conductivity, high capacity, and long life

Inactive Publication Date: 2016-12-21
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

What's more serious is that the intermediate products of the lithium-sulfur battery reaction have different solubility in the electrolyte, which causes it to produce a shuttle effect between the positive and negative electrodes, resulting in rapid capacity decay and low coulombic efficiency.

Method used

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  • Nitrogen-rich hollow carbon sphere/sulfur composite positive electrode material for lithium-sulfur battery and preparation method of nitrogen-rich hollow carbon sphere/sulfur composite positive electrode material
  • Nitrogen-rich hollow carbon sphere/sulfur composite positive electrode material for lithium-sulfur battery and preparation method of nitrogen-rich hollow carbon sphere/sulfur composite positive electrode material
  • Nitrogen-rich hollow carbon sphere/sulfur composite positive electrode material for lithium-sulfur battery and preparation method of nitrogen-rich hollow carbon sphere/sulfur composite positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Melamine and Co(CH 3 COO) 2 4H 2 O weighed according to the mass ratio of 1:1, first stirred with a stirrer for 15 minutes at a low speed, and then stirred at a high speed for 15 minutes to obtain a uniform pink powder, which was placed in a crucible and transferred to a tubular electric furnace. 400°C for 2h, 500°C for 2h, 650°C for 2h, heating rate 2°C / min, soak and wash the product in 150ml HCL solution with a mass fraction of 10% for 24h, and use a pore size of 20-50μm The hydrophilic membrane was suction-filtered and washed with deionized water until neutral, and dried at 80°C for 12 hours to obtain nitrogen-enriched hollow carbon spheres.

[0028] Mix 1g of nitrogen-enriched hollow carbon spheres with 1.5g of elemental sulfur, add ethanol, and then ball mill for 120min at a speed of 400r / min. After drying, transfer to a stainless steel reactor for heating at 155˚C for 12h. Nitrogen-rich hollow carbon sphere / sulfur composite cathode material.

[0029] Mix the n...

Embodiment 2

[0031] Melamine and Co(CH 3 COO) 2 4H 2 O weighed according to the mass ratio of 1:2, first stirred with a stirrer at low speed for 20 minutes, then at high speed for 20 minutes to obtain a uniform pink powder, put the uniform pink powder in a crucible and transfer it to a tubular electric furnace, nitrogen atmosphere 300°C for 1h, 400°C for 1h, 520°C for 2h, 650°C for 2h, heating rate 1°C / min, soak the product in 150ml HCL solution with a mass fraction of 10% for 24h, then use A hydrophilic filter membrane with a pore size of 20-50 μm is sucked and washed with deionized water until neutral, and dried at 70° C. for 24 hours to obtain nitrogen-enriched hollow carbon spheres.

[0032] Mix 1g of nitrogen-enriched hollow carbon spheres with 1.5g of elemental sulfur, add carbon disulfide, and then ball mill for 60min at a ball mill speed of 500r / min. After drying, transfer to a stainless steel reactor for heating at 160˚C for 6h to obtain Nitrogen-rich hollow carbon sphere / sulfu...

Embodiment 3

[0035] Melamine and Co(CH 3 COO) 2 4H 2 O is weighed according to the mass ratio of 1:2, first stirred with a stirrer at low speed for 30 minutes, and then at high speed for 30 minutes, and the obtained uniform pink powder was placed in a crucible and transferred to a tubular electric furnace. Incubate at ˚C for 2 hours, at 500˚C for 2 hours, at 750˚C for 2 hours, and at a heating rate of 3˚C / min. After soaking the product in 200ml of 10% HCL solution for 24 hours, filter it through a hydrophilic filter with a pore size of 20-50μm The membrane was suction-filtered and washed with deionized water until neutral, and dried at 100°C for 8 hours to obtain nitrogen-enriched hollow carbon spheres.

[0036] Mix 1g of nitrogen-enriched hollow carbon spheres with 5g of sodium sulfide, ultrasonically disperse them in 100ml of water, add 20ml of 1% HCL solution and stir for 6 hours, then transfer to a stainless steel reaction kettle for heating at 160˚ after centrifugal separation and d...

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Abstract

The invention discloses a nitrogen-rich hollow carbon sphere / sulfur composite positive electrode material for a lithium-sulfur battery and a preparation method of the nitrogen-rich hollow carbon sphere / sulfur composite positive electrode material, and belongs to the field of a new generation of electrochemical energy storage. The composite positive electrode material comprises nitrogen-rich hollow carbon spheres which are prepared from a melamine compound as a nitrogen-rich carbon source and taken as a sulfur-bearing matrix and a conductive network, and have large specific surface area, high porosity and excellent conductivity; and the nitrogen-rich hollow carbon sphere / sulfur composite positive electrode material is prepared through a simple compound method. The nitrogen-rich hollow carbon spheres provided by the invention are simple in preparation method and friendly to environment; industrial production is easy to implement; the prepared nitrogen-rich hollow carbon sphere / sulfur composite positive electrode material has the advantages of high specific discharge capacity, stable cycle performance, good rate capability and the like when used for the lithium-sulfur battery, and has a broad application prospect in the fields of electric vehicles, energy storage stations and portable equipment.

Description

technical field [0001] The invention belongs to the field of new generation electrochemical energy storage, in particular to a nitrogen-enriched hollow carbon sphere / sulfur composite cathode material for a lithium-sulfur battery and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of high-energy-density secondary batteries, lithium-sulfur batteries are considered to be the most attractive and potential next-generation electrochemical energy storage systems. Calculated on the basis of lithium anode and sulfur cathode, in the case of complete reaction of sulfur to generate lithium sulfide, the lithium-sulfur battery can reach a specific energy of 2600Wh / kg, which is about the same as that of traditional commercial LiCoO 2 / graphite system five times that of lithium-ion batteries. In addition, sulfur also has the characteristics of abundant natural reserves, low cost, and environmental friendliness. However, the main reas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62
CPCH01M4/364H01M4/38H01M4/625Y02E60/10
Inventor 许家齐曹勇
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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