Preparation method of sulfur/porous carbon composite cathode material

A composite positive electrode material and porous carbon technology, which is applied in battery electrodes, electrical components, non-aqueous electrolyte batteries, etc., can solve the problems of low sulfur content of composite positive electrode materials, difficulty in further improving the energy density of lithium-sulfur batteries, and small specific surface area, etc. Achieve improved electrochemical performance, good reversibility and cycle stability

Inactive Publication Date: 2017-01-04
OPTIMUM BATTERY CO LTD
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Problems solved by technology

However, traditional porous materials generally have small specific surface area, single pore size, poor structural consistency, difficult to control the pore size, and limited ability of the material to absorb the active substance sulfur, resulting in low sulfur content and uneven distribution in the prepared composite cathode material. Poor performance, after assembling into a battery for several cycles, there will still be a large amount of active material dissolved from the pores of the material structure, resulting in the loss of active material, which makes it difficult to further increase the energy density of lithium-sulfur batteries

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  • Preparation method of sulfur/porous carbon composite cathode material
  • Preparation method of sulfur/porous carbon composite cathode material
  • Preparation method of sulfur/porous carbon composite cathode material

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[0030] The present invention provides a kind of preparation method of novel sulfur / porous carbon composite cathode material, comprising the following steps: (1) hydrothermal pre-carbonization: take a certain amount of glucose and dissolve it in deionized water, add organic nitrogen from the solution After stirring and mixing evenly, transfer it to the reaction kettle. After hydrothermal reaction at a certain temperature for a certain period of time, take it out after cooling to room temperature, filter and wash with deionized water, then wash with absolute ethanol, and dry it with air at 50°C for 24 hours to prepare Nitrogen doped precursor.

[0031] (2) Activation: Mix the nitrogen-doped precursor prepared in step 1 with the pore-enlarging agent in a certain mass ratio, add deionized water, stir at 70°C, take it out and put it in a porcelain boat after it becomes viscous dry. Finally, it is calcined for a certain period of time under the protection of inert gas in a high-tem...

Embodiment 1

[0042] (1) Weigh 16.0g of glucose and dissolve it in 40.0mL of deionized water, add 1.5g of acetamide in the solution, stir and mix, transfer to a 50mL reaction kettle, perform hydrothermal reaction at 200°C for 5h, take it out after cooling at room temperature, and remove The nitrogen-doped precursor was prepared by filtering and washing with deionized water, then washing with absolute ethanol, and air-drying at 50° C. for 24 hours.

[0043](2) Mix the nitrogen-doped precursor and KOH at a mass ratio of 1:3, add a certain amount of deionized water, and stir at 70°C (1g precursor plus 20mL deionized water), take it out and put it in a porcelain boat after it becomes viscous Dry at 80°C for 24h. Finally in N 2 Calcined in a tube furnace at 500°C under protection for 2 hours, then cooled and taken out. Add a certain amount of deionized water and sonicate for 30 minutes, then add absolute ethanol and sonicate for 30 minutes, filter and dry with suction to obtain a nitrogen-dope...

Embodiment 2

[0046] (1) Weigh 16.0g of glucose and dissolve it in 40.0mL of deionized water, add 2.0g of acetamide in the solution, stir and mix, transfer to a 50mL reaction kettle, perform hydrothermal reaction at 220°C for 5h, take it out after cooling at room temperature, and remove The nitrogen-doped precursor was prepared by filtering and washing with deionized water, then washing with absolute ethanol, and air-drying at 50° C. for 24 hours.

[0047] (2) Mix the nitrogen-doped precursor and KOH at a mass ratio of 1:4, add a certain amount of deionized water and stir at 70°C (1g precursor plus 20mL deionized water), take it out and put it in a porcelain boat after it becomes viscous Dry at 80°C for 24h. Finally in N 2 Calcined in a tube furnace at 600°C under protection for 2 hours, then cooled and taken out. Add a certain amount of deionized water and sonicate for 30 minutes, then add absolute ethanol and sonicate for 30 minutes, filter and dry with suction to obtain a nitrogen-dope...

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Abstract

The invention provides a preparation method of a sulfur/porous carbon composite cathode material, comprising the steps of (1) hydrothermally pre-carbonizing: mixing an organic nitrogen source and an organic carbon source, and preparing a nitrogen-doped precursor via hydrothermal reaction; (2) activating: mixing the nitrogen-doped precursor with a pore-expanding agent, and calcining at high temperature to obtain nitrogen-doped porous carbon material; (3) preparing the sulfur/porous carbon composite cathode material: mixing sulfur and porous carbon, reacting for a period of time, and grinding to obtain the sulfur/porous carbon composite cathode material. By using glucose as a carbon source and acetamide as an organic nitrogen source, and controlling morphology of the carbon material through a series of methods such a hydrothermal pre-carbonization, pore expanding with the pore-expanding agent, and low temperature melting, it is ensured that sulfur particles are adsorbed to ducts of the carbon material and electrochemical properties of an electrode are improved; the sulfur/porous carbon composite cathode material having good reversibility and cycle stability is thereby worthier of popularization.

Description

[0001] 【Technical field】 [0002] The invention relates to the field of positive electrode materials for power lithium batteries, in particular to a method for preparing sulfur / porous carbon composite positive electrode materials. [0003] 【Background technique】 [0004] With the rapid development of society, the demand for energy is increasing day by day, as well as the depletion of reserves and the pollution of fossil fuels to the environment, people's demand for new alternative energy sources is increasing day by day. Traditional lithium-ion batteries have been widely studied as new alternative energy sources. However, the energy density of general lithium-ion batteries is difficult to exceed 300Wh / kg, which limits their wide application in pure electric vehicles and hybrid vehicles. . Therefore, seeking low-cost, high-energy-density renewable energy is the key to solving the problem of lithium battery development. Elemental sulfur is considered to be an excellent cathode ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M10/052
CPCH01M4/364H01M4/38H01M10/052Y02E60/10
Inventor 刘晓艳杨斌斌
Owner OPTIMUM BATTERY CO LTD
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