Preparation method of network-like carbon-loaded iron-based compound material and application of network-like carbon-loaded iron-based compound material in lithium-sulfur battery

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

Inactive Publication Date: 2019-05-14
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 network-like carbon-loaded iron-based compound material and application of network-like carbon-loaded iron-based compound material in lithium-sulfur battery
  • Preparation method of network-like carbon-loaded iron-based compound material and application of network-like carbon-loaded iron-based compound material in lithium-sulfur battery
  • Preparation method of network-like carbon-loaded iron-based compound material and application of network-like carbon-loaded iron-based compound material in lithium-sulfur battery

Examples

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Effect test

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

The invention relates to a preparation method of a network-like carbon-loaded iron-based compound material and an application of the network-like carbon-loaded iron-based compound material in a lithium-sulfur battery, and belongs to the field of electrochemistry; the method comprises the following steps of taking slightly oxidized graphene as a substrate, taking ferric nitrate nonahydrate as an iron source, taking glucose hydrothermal carbon as a carbon source of iron carbide and a pore-forming substrate, taking ammonia gas generated in the high-temperature pyrolysis process of melamine as a nitrogen source of an iron-nitrogen compound, and meanwhile, enabling ammonia to corrode the glucose hydrothermal carbon substrate to generate a net-shaped structure. The method has the beneficial effects that 1) the process is simple, and the product cost is low; 2) the obtained positive electrode material has a rich hole structure and ion and electron transport channels, the conductivity of the material can be improved, and the loss of the polysulfide compound can be effectively inhibited, the stability of the electrode material is remarkably improved, and the electrochemical performance is improved; and 4) the adsorption and catalysis of the polysulfide compound are achieved by utilizing the synergistic effect of the iron carbide and the iron-nitrogen compound, and the catalytic action can be used for accelerating the reaction dynamics of the lithium-sulfur battery, so that the transition of the soluble polysulfide compound to insoluble sulfide is accelerated, and the shuttle effectis greatly inhibited.

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 Applications(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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