A kind of porous sulfur/carbon composite material and its preparation method and lithium-sulfur battery application

A carbon composite material, carbon composite technology

Active Publication Date: 2021-06-22
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The utilization rate of sulfur is low, and the utilization rate of active sulfur is very low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Weigh 8g of sublimated sulfur, place it in a closed reactor A with a volume of 5L, heat it to 150°C, and react for 5h; raise the temperature of the reactor to 500°C, and keep the internal temperature of the reactor at 500°C. The sulfur vapor in the reactor A is sprayed into the reactor B by nitrogen at a pressure of 0.5 MPa, and the diameter of the nozzle is 0.1 mm. In addition, the carbon disulfide emulsion dispersed with 10% activated carbon was atomized into particles of 20 μm at a temperature of 20°C and sprayed into reactor B at the same time, and 0.05% by mass of six Chloroparaxylene. Control the amount of emulsion sprayed into container B and the flow rate of sulfur vapor sprayed into container B. The mass ratio of emulsion to sulfur vapor is 200:1, so as to achieve the contact between sulfur vapor and organic solvent droplets containing carbon materials The temperature was 45°C. Collect the prepared solid material, extract it with carbon disulfide, dry the obt...

Embodiment 2

[0031] Weigh 4g of precipitated sulfur, place it in a closed reactor A with a volume of 5L, heat it to 140°C, and react for 5h; raise the temperature of the reactor to 700°C, and keep the internal temperature of the reactor at 700°C. The sulfur vapor in the reactor A is sprayed into the reactor B by nitrogen at a pressure of 0.5 MPa, and the diameter of the nozzle is 0.2 mm. In addition, the carbon disulfide emulsion dispersed with 20% activated carbon was atomized into 20 μm particles at a temperature of 25°C, and sprayed into reactor B at the same time, and 0.1% by mass of olefin was added to the dispersant carbon disulfide. Propyl bromide. Control the amount of emulsion sprayed into container B and the flow rate of sulfur vapor sprayed into container B, the mass ratio of emulsion to sulfur vapor is 100:1, so as to achieve the contact between sulfur vapor and organic solvent droplets containing carbon materials The temperature was 45°C. Collect the prepared solid material,...

Embodiment 3

[0033] Weigh 8g of refined sulfur, place it in a closed reactor A with a volume of 5L, heat it to 150°C, and react for 5h; raise the temperature of the reactor to 600°C, and keep the internal temperature of the reactor at 600°C. The sulfur vapor in the reactor A is sprayed into the reactor B by nitrogen at a pressure of 0.8 MPa, and the diameter of the nozzle is 0.2 mm. In addition, the carbon disulfide emulsion dispersed with 10% activated carbon was atomized into 20 μm particles at a temperature of 30°C, and sprayed into reactor B at the same time, and 0.1% by mass of olefin was added to the dispersant carbon disulfide. Propyl Chloride. Control the amount of emulsion sprayed into container B and the flow rate of sulfur vapor sprayed into container B, the mass ratio of emulsion to sulfur vapor is 100:1, so as to achieve the contact between sulfur vapor and organic solvent droplets containing carbon materials The temperature was 45°C. Collect the prepared solid material, ext...

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Abstract

The invention relates to a porous sulfur / carbon composite material and a preparation method, and the application of the prepared porous sulfur / carbon composite material as a positive electrode lithium-sulfur battery. The preparation scheme is as follows: 1) Melt solid sulfur at low temperature for a certain period of time to liquefy the sulfur and undergo ring-opening fusion reaction of S8; 2) Raise the temperature to gasify the liquid sulfur, and spray the gasified sulfur into the sealed reactor at high speed 3) Spray the pre-prepared low-temperature organic solvent dispersion of carbon into the closed reactor at the same time, so that the high-temperature sulfur vapor is quenched, and a composite solid material of sulfur and carbon is formed during the quenching process; 4 ) Separating porous sulfur / carbon solids and organic solvents and extracting them to prepare high-purity porous sulfur / carbon composites; 5) preparing porous sulfur / carbon composites into electrode materials that can be used for lithium-sulfur battery cathodes after high-speed ball milling . The material can be used to prepare the positive electrode of lithium-sulfur batteries, and exhibits excellent electrochemical performance.

Description

technical field [0001] The invention belongs to the field of chemical power sources, and relates to a method for preparing a sulfur cathode material, in particular to a method for preparing a high-performance porous sulfur / carbon composite material. Background technique [0002] Social development has an increasing demand for energy storage technology. Lithium-sulfur batteries have high theoretical specific capacity (1675mAh / g) and theoretical energy density (2600Wh / kg), which may meet new battery energy storage systems (such as portable electronic devices, electric vehicles, electrochemical energy storage stations) in the future. It has broad application potential and has become a research hotspot of high specific energy secondary batteries. [0003] Elemental sulfur is an insulator of electrons and ions, and its electronic and ion conductivity is extremely poor. At the same time, the dissolution of lithium polysulfide, a product of lithium discharge, leads to serious capa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M10/052
CPCY02E60/10
Inventor 陈剑郭德才
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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