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Preparation method of a network-like carbon-supported iron-based compound material and its application in lithium-sulfur batteries

A lithium-sulfur battery and network-like technology, applied in the field of electrochemistry, can solve problems such as the lack of in-depth research on catalysis, the suppression of the shuttle effect of difficult polysulfide compounds, and the reduction of the use of noble metal catalysts, so as to increase the effect of sulfur fixation and suppress the shuttle effect , The synthetic method is simple and convenient

Inactive Publication Date: 2020-08-25
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] (2) Heteroatom-doped carbon-sulfur composite carbon materials are non-polar materials and the adsorption force between polar polysulfide compounds is weak, and it is difficult to effectively inhibit the shuttle effect of polysulfide compounds only by single physical adsorption
However, the catalytic effect of iron compounds on polysulfide compounds has not been studied in depth. If a new type of iron-based compound that can adsorb and catalyze polysulfide compounds can be synthesized, it can not only obtain good performance of lithium-sulfur batteries, but also greatly reduce the cost of precious metal catalysts. The use of lithium-sulfur batteries reduces the cost

Method used

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  • Preparation method of a network-like carbon-supported iron-based compound material and its application in lithium-sulfur batteries
  • Preparation method of a network-like carbon-supported iron-based compound material and its application in lithium-sulfur batteries
  • Preparation method of a network-like carbon-supported iron-based compound material and its application in lithium-sulfur batteries

Examples

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Embodiment example 1

[0030] At room temperature, 1.0050 g of ferric nitrate nonahydrate and 10 mL of GO (5 mg / mL) were added to 40 mL of deionized water, sonicated for 2 hours and stirred for 12 hours. 1.0052 g of glucose was added and stirring was continued for 8 hours at room temperature. The resulting homogeneous mixture was transferred into a hydrothermal kettle and kept at 180°C for 10 hours. After the reaction kettle was lowered to room temperature, it was suction-filtered, washed three times with deionized water, and dried at 60°C. The dried product was thoroughly ground and mixed with 10 times the mass of melamine, and then kept at 900°C for 1 hour under the protection of argon with a heating rate of 5°C / min. When the temperature drops to room temperature, mix the resulting material and binder (PVDF) at a ratio of 9:1, add NMP and stir at room temperature for 12 hours to form a uniform slurry, which is coated on a commercial PP separator with a thickness of 10 microns and heated at 80°C D...

Embodiment example 2

[0036] At room temperature, 1.5 g of ferric nitrate nonahydrate and 20 mL of GO (5 mg / mL) were added to 40 mL of deionized water, sonicated for 1 hour and stirred for 8 hours. 2 g of glucose were added and stirring was continued for 12 hours at room temperature. The resulting homogeneous mixture was transferred into a hydrothermal kettle and kept at 160°C for 10 hours. After the reaction kettle was lowered to room temperature, it was suction-filtered, washed three times with deionized water, and dried at 60°C. The dried product was thoroughly ground and mixed with 8 times the mass of melamine, and then kept at 800°C for 4 hours under the protection of argon with a heating rate of 5°C / min. When the temperature drops to room temperature, mix the resulting material and binder (PVDF) at a ratio of 9:1, add NMP and stir at room temperature for 12 hours to form a uniform slurry, which is coated on a commercial PP separator with a thickness of 10 microns and heated at 80°C Dry for 1...

Embodiment example 3

[0042] At room temperature, 0.5 g of ferric nitrate nonahydrate and 15 mL of GO (5 mg / mL) were added to 40 mL of deionized water, sonicated for 3 hours and stirred for 10 hours. 0.5 g of glucose was added and stirring was continued for 10 hours at room temperature. The resulting homogeneous mixture was transferred into a hydrothermal kettle and kept at 170°C for 13 hours. After the reaction kettle was lowered to room temperature, it was suction-filtered, washed three times with deionized water, and dried at 60°C. The dried product was thoroughly ground and mixed with 6 times the mass of melamine, and then kept at 1000°C for 2 hours under the protection of argon with a heating rate of 5°C / min. When the temperature drops to room temperature, mix the resulting material and binder (PVDF) at a ratio of 9:1, add NMP and stir at room temperature for 12 hours to form a uniform slurry, which is coated on a commercial PP separator with a thickness of 10 microns and heated at 80°C Dry f...

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Abstract

A method for preparing a network-shaped carbon-supported iron-based compound material and its application in lithium-sulfur batteries, belonging to the field of electrochemistry, using less graphene oxide as the substrate, iron nitrate nonahydrate as the iron source, and glucose hydrothermal carbon As the carbon source and pore-forming substrate of iron carbide, the ammonia gas produced during the high-temperature pyrolysis of melamine was used as the nitrogen source of the iron-nitrogen compound, and the ammonia gas corroded the glucose hydrothermal carbon substrate to form a network structure. Beneficial effects of the present invention: 1) The process is simple and the product cost is low; 2) The obtained positive electrode material has a rich pore structure and ion and electron transmission channels, which can not only improve the conductivity of the material but also effectively inhibit the loss of polysulfide compounds, and significantly improve the electrode material. stability and improve electrochemical performance. 4) Using the synergistic effect of iron carbide and iron nitrogen compounds to achieve the adsorption and catalysis of polysulfide compounds, the catalytic effect can accelerate the reaction kinetics of lithium-sulfur batteries, accelerate the transformation of soluble polysulfide compounds into insoluble sulfides, and greatly inhibit shuttle effect.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and relates to a network-shaped carbon-supported iron-based compound material modified lithium-sulfur battery separator, in particular to a nitrogen-doped network-shaped carbon-supported iron carbide and iron-nitrogen compound porous material modified lithium-sulfur battery separator. To achieve the adsorption and catalysis of polysulfide compounds. Background technique [0002] Lithium-sulfur batteries are composed of metal lithium as the negative electrode and sulfur as the positive electrode, and have a high energy density (2600Wh / kg) far greater than that of the currently widely used lithium batteries. In addition, sulfur has outstanding advantages such as abundant reserves, low toxicity, cheap and easy to obtain, and environmental friendliness. Therefore, lithium-sulfur batteries have become one of the high-energy-density secondary batteries that have attracted wide attention. However, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/052H01M50/403H01M50/431
CPCY02E60/10
Inventor 张凤祥杨贺张旭李永鹏邓小昱雷达
Owner DALIAN UNIV OF TECH
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