One-step preparation of sulfur and nitrogen double-doped cotton-based porous carbon

A cotton, sulfur and nitrogen technology, applied in the field of electrochemistry, can solve the problems affecting the rapid charge and discharge performance of the battery, reduce the charge and discharge specific capacity of the battery, and reduce the utilization efficiency of active sulfur, so as to shorten the preparation time, save time and reduce production costs Effect

Active Publication Date: 2019-11-05
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the commercial application of lithium-sulfur batteries is still limited by many aspects: on the one hand, the electronic conductivity of elemental sulfur itself is too low, and there is serious polarization, which makes the transmission efficiency of electrons on the surface of the active material low, which seriously restricts the battery. On the other hand, the active sulfur will decompose during the discharge process to produce intermediate products such as polysulfides soluble in the electrolyte, which will cause a serious "shuttle effect" and seriously reduce the charge-discharge specific capacity of the battery. and Coulombic efficiency
For lithium-sulfur batteries, there are still some difficulties that need to be overcome. Due to the electronic insulation of active sulfur, the transmission of electrons on the electrode surface is severely hindered, which affects the rapid charge and discharge performance of the battery.
In addition, the active sulfur will be reduced to polysulfides that can be dissolved in the electrolyte during the discharge process, forming the unique shuttle effect of lithium-sulfur batteries, which will not only cause the loss of active sulfur but also reduce the utilization efficiency of active sulfur.

Method used

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  • One-step preparation of sulfur and nitrogen double-doped cotton-based porous carbon
  • One-step preparation of sulfur and nitrogen double-doped cotton-based porous carbon
  • One-step preparation of sulfur and nitrogen double-doped cotton-based porous carbon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Firstly, the obtained cotton material is washed with clear water, and then put into a drying oven for drying at 60°C. Mix the dried cotton and potassium hydroxide in a mass ratio of 1:3 to prepare a potassium hydroxide solution and soak the cotton. Weigh cystine whose mass is twice that of cotton, put it into potassium hydroxide solution, and mix well. The solution is sealed and ultrasonically treated for a certain period of time, and placed in an environment with a temperature of 80° C. and sealed and soaked for 5 days, so that the cotton material is fully etched and activated. Then collect the soaked product. After the material is fully dried, put it into a small porcelain boat and put it in a tube furnace for calcination under an argon atmosphere. Set the temperature of the furnace to rise to 850°C at a rate of 3°C / min. And keep warm for 1h. After the furnace is naturally cooled to room temperature, the sample is taken out and fully ground, and then the sample is t...

Embodiment 2

[0034] Firstly, the obtained cotton material is washed with clear water, and then put into a drying oven for drying at 60°C. Mix the dried cotton and potassium hydroxide in a mass ratio of 1:3 to prepare a potassium hydroxide solution and soak the cotton. Weigh cystine whose mass is twice that of cotton, put it into potassium hydroxide solution, and mix well. The solution is sealed and ultrasonically treated for a certain period of time, and placed in an environment with a temperature of 80° C. and sealed and soaked for 5 days, so that the cotton material is fully etched and activated. Then collect the soaked product. After the material is fully dried, put it into a small porcelain boat and put it in a tube furnace for calcination under an argon atmosphere. Set the temperature of the furnace to rise to 850°C at a rate of 4°C / min. And keep warm for 1h. After the furnace is naturally cooled to room temperature, the sample is taken out and fully ground, and then the sample is t...

Embodiment 3

[0036] Firstly, the obtained cotton material is washed with clear water, and then put into a drying oven for drying at 60°C. Mix the dried cotton and potassium hydroxide in a mass ratio of 1:4 to prepare a potassium hydroxide solution and soak the cotton. Weigh cystine whose mass is twice that of cotton, put it into potassium hydroxide solution, and mix well. The solution is sealed and ultrasonically treated for a certain period of time, and placed in an environment with a temperature of 80° C. and sealed and soaked for 5 days, so that the cotton material is fully etched and activated. Then collect the soaked product. After the material is fully dried, put it into a small porcelain boat and put it in a tube furnace for calcination under an argon atmosphere. Set the temperature of the furnace to rise to 850°C at a rate of 4°C / min. And keep warm for 1h. After the furnace is naturally cooled to room temperature, the sample is taken out and fully ground, and then the sample is t...

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Abstract

The invention discloses a method for one-step preparation of sulfur-nitrogen-doped cotton-based porous carbon. The method utilizes biomass material cotton as a carbon source and finishes cotton carbon pore formation and sulfur-nitrogen doping in one calcination process. The method shortens time, saves a lot of energy, reduces the economic cost and is conducive to industrial production of a lithium-sulfur battery electrode material. The method utilizes easily available raw materials, realizes a low production cost, has a simple synthesis route and has mild reaction conditions and high production efficiency.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and in particular relates to a material for a positive electrode sheet of a lithium-sulfur battery. Background technique [0002] With the reduction of non-renewable fossil fuels and concerns about serious environmental pollution, more and more renewable and clean energy sources have replaced traditional energy materials. The use of battery systems to store surplus electricity has been developed over the past decade. So far, lithium-ion batteries have successfully enabled the widespread use of portable electronic devices and power tools. Despite these achievements, Li-ion batteries suffer from high technical cost, safety, and limited energy density. To solve these annoying problems and develop next-generation energy storage systems, lithium-sulfur batteries have begun to accelerate development. The theoretical specific capacity of lithium-sulfur batteries is 1675mAh / g, and the theoretical energ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/583
CPCH01M4/58H01M4/581H01M4/583Y02E60/10
Inventor 陈仕谋李雪锋宋玉婷凡俊田汶凯华张锁江
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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