A kind of preparation method of lithium-sulfur battery cathode material

A positive electrode material, lithium-sulfur battery technology, applied in the direction of battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve the problems of harsh process conditions, long load time, difficult to realize automatic process, etc., to achieve increased sulfur load, composite The effect of short time and excellent electrochemical performance

Active Publication Date: 2019-11-22
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process conditions of this method are relatively harsh, and the loading time is long, so it is difficult to realize the automatic process.

Method used

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  • A kind of preparation method of lithium-sulfur battery cathode material
  • A kind of preparation method of lithium-sulfur battery cathode material
  • A kind of preparation method of lithium-sulfur battery cathode material

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preparation example Construction

[0038] The preparation method of lithium-sulfur battery cathode material of the present invention, this method is based on evaporative cooling device, such as figure 1 As shown, the specific structure is: comprising a sealed container 1, the sealed container 1 is connected with a cooling device 3 and an inert gas pipe 2, and the cooling device 3 is connected with a vacuum pump; the cooling device 3 is a condensation pipe, a multi-tube cooler or a cooling tower;

[0039] The specific method is:

[0040] Step 1, add elemental sulfur into the sealed container 1, and load the pretreated porous carbon material in the cooling device 3; the pretreatment of the porous carbon material is to wash the porous carbon material with deionized water at 80-100 ° C Dry for 10-24 hours;

[0041] Step 2, feed an inert atmosphere into the sealed container 1 (the inert atmosphere is nitrogen, helium, neon, argon or xenon), and turn on the vacuum pump to keep the negative pressure -0.1~-10.0Mpa in ...

Embodiment 1

[0047] (1) Pretreatment of the acetylene black porous carbon material and the used container conduit: wash 1 g of the acetylene black porous carbon material and the used container and conduit with deionized water and put them in a blast drying oven to dry at 80°C 10h, remove surface moisture;

[0048] (2) 1g of elemental sulfur is put into a sealed container, and 1g of acetylene black porous carbon material is loaded inside the cooling device (condenser);

[0049] (3) Introduce nitrogen, and turn on the vacuum pump, adjust the gas cylinder and the vacuum pump valve to maintain -0.1Mpa in the sealed container, and keep it for 30s until the air in the entire device is completely eliminated;

[0050] (4) Heat the sealed container to a temperature of about 500°C, the elemental sulfur in the sealed container is heated and sublimated into sulfur vapor, and the sulfur vapor enters the cooling device driven by negative pressure, and keeps for 1 second to fill the cooling device with s...

Embodiment 2

[0056] (1) Pretreatment of the phenolic resin pyrolysis porous carbon material and the container conduit used: 100g of the phenolic resin pyrolysis porous carbon material and the container and conduit used were cleaned with deionized water and placed in a blast drying oven Dry at 100°C for 24 hours to remove surface moisture;

[0057] (2) 100g of elemental sulfur is put into a sealed container, and 100g of phenolic resin pyrolysis porous carbon material is loaded inside the cooling device (multi-tube cooler);

[0058] (3) Introduce helium, turn on the vacuum pump, adjust the gas cylinder and the vacuum pump valve to maintain -10.0Mpa in the sealed container, and keep it for 30 minutes until the air in the entire device is completely eliminated;

[0059] (4) Use an electric heating mantle to heat the sealed container, the heating temperature is about 300°C, the elemental sulfur in the sealed container is heated and sublimated into sulfur vapor, and the sulfur vapor enters the c...

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Abstract

The invention discloses a preparation method of lithium-sulfur battery positive electrode materials. The preparation method includes the steps: adding elemental sulfur into a sealed container, and loading pretreated porous carbon materials into a cooling device; leading inert atmosphere into the sealed container, opening a vacuum pump, and enabling the inside of the sealed container to keep negative pressure until air in the evaporative cooling device is completely discharged; performing heating for the sealed container, enabling the elemental sulfur to be heated and sublimated into sulfur steam, and enabling the cooling device to be gradually filled with the sulfur steam; opening the cooling device, and keeping the negative pressure for a certain time according to the quality of the porous carbon materials to obtain sulfur load porous carbon composite material powder; preparing the sulfur load porous carbon composite material powder into working electrode materials. The preparation method is simple, convenient and easy to operate, and the obtained positive electrode materials are high in sulfur load quantity, uniform in sulfur distribution, high in active material utilization, efficient in energy and environmentally friendly and have excellent electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of electrode material preparation, and in particular relates to a method for preparing a positive electrode material of a lithium-sulfur battery. Background technique [0002] With the advancement of human industrialization, the earth's resources are increasingly depleted. While people are eager to find new energy sources, they pay more attention to the recycling of existing energy sources. In addition, environmental pollution caused by the use of fossil fuels has also been criticized by environmentalists and scientists. Therefore, the development and utilization of clean energy solar and wind energy is imminent, and the utilization of these energy sources requires safe, low-cost, high energy density and long-life electrochemical energy storage devices to achieve. As a new type of chemical power source, lithium-ion battery has the advantages of long cycle life, high specific capacity, stable voltage, no mem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M4/139H01M10/052
CPCH01M4/139H01M4/364H01M4/38H01M4/625H01M10/052Y02E60/10
Inventor 燕映霖王岩任冰陈利萍杨蓉许云华李巧乐秦海超史忙忙魏一奇
Owner XIAN UNIV OF TECH
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