Carbon material used for lithium-sulfur battery and preparation thereof, and applications

A lithium-sulfur battery and carbon material technology, applied in lithium batteries, battery electrodes, non-aqueous electrolyte batteries, etc., can solve the problem that the sulfur load is difficult to meet the actual demand, the utilization rate of active materials is reduced, and the transmission of electrons and ions is limited, etc. problem, to achieve the effect of shortening the ion transmission distance, promoting infiltration, and smooth electron transmission

Active Publication Date: 2019-06-11
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Simply increasing the thickness of the scraped electrode material to increase the sulfur loading per unit area is difficult to meet the actual demand
Because as the thickness of the electrode increases, the electron and ion transport inside the electrode is limited, which is manifested as cycle stability, decreased rate performance, and decreased utilization of active materials.
In addition, since the electrochemical reaction will occur on the three-phase interface of the electrode-electrolyte-active material, the insoluble charge-discharge products will preferentially deposit on the upper surface of the electrode during the charge-discharge process, blocking the ion transport channel and restricting the flow rate of the lower layer. capacity of active substances

Method used

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  • Carbon material used for lithium-sulfur battery and preparation thereof, and applications
  • Carbon material used for lithium-sulfur battery and preparation thereof, and applications
  • Carbon material used for lithium-sulfur battery and preparation thereof, and applications

Examples

Experimental program
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Effect test

Embodiment 1

[0048] Take 3 pieces of 2cm*4cm nickel foam and place them in 3M HCl solution, ultrasonicate at room temperature for 30 minutes, wash with deionized water for 3 times, then transfer to 30mL methanol and 3mL dissolved in 0.075M zinc nitrate and 0.25M hexamethylenetetramine 2M nitric acid mixed solution, sealed in a hydrothermal reaction kettle and heated in an oven at 60°C for 48h. After cooling to room temperature, wash the foamed nickel sheet 3 times with water, then immerse it in 250mL of 0.01M 2-methylimidazole aqueous solution, let it stand for 6h, wash it with water 3 times, and then immerse it in 40mL of 0.5M cobalt nitrate methanol solution, let stand for 24h. The product obtained in this step was washed 3 times with methanol, and then dried in an oven at 60° C. for 2 h. Subsequently, it was transferred to a tube furnace under Ar (100 mLmin -1 ) and H 2 (10mLmin -1 ) in a mixed atmosphere at 20°C min -1 The heating rate was increased to 550 °C. After keeping the t...

Embodiment 2

[0051] Take 3 pieces of 2cm*4cm aluminum foil and put them in 3M HCl solution, sonicate at room temperature for 30 minutes, wash with deionized water for 3 times, then transfer to 30mL of methanol and 3mL of 2M nitric acid mixed solution, sealed in a hydrothermal reaction kettle and heated in an oven at 60°C for 48h. After cooling to room temperature, the obtained aluminum foil was washed with water three times, then immersed in 250mL of 0.01M 2-methylimidazole aqueous solution, after standing for 6h, washed with water for three times, and then immersed in 40mL of 0.5M cobalt nitrate in methanol Solution, let stand for 24h. The product obtained in this step was washed 3 times with methanol, and then dried in an oven at 60° C. for 2 h. Subsequently, it was transferred to a tube furnace under Ar (100 mLmin -1 ) and H 2 (10mLmin -1 ) in a mixed atmosphere at 20°C min -1 The heating rate was increased to 550 °C. After keeping the temperature at 550°C for 10 minutes, pass int...

Embodiment 3

[0054] Take 3 pieces of 2cm*4cm nickel foam and place them in 3M HCl solution, ultrasonicate at room temperature for 30 minutes, wash with deionized water for 3 times, then transfer to 30mL methanol and 3mL dissolved in 0.075M zinc nitrate and 0.25M hexamethylenetetramine 2M nitric acid mixed solution, sealed in a hydrothermal reaction kettle and heated in an oven at 60°C for 48h. After cooling to room temperature, wash the foamed nickel sheet 3 times with water, then immerse it in 250mL of 0.01M 2-methylimidazole aqueous solution, let it stand for 6h, wash it with water 3 times, and then immerse it in 40mL of 0.5M cobalt nitrate methanol solution, let stand for 24h. The product obtained in this step was washed 3 times with methanol, and then dried in an oven at 60° C. for 2 h. Subsequently, it was transferred to a tube furnace under Ar (100 mLmin -1 ) and H 2 (10mLmin -1 ) in a mixed atmosphere at 20°C min - Raise the temperature to 950°C, keep the temperature for 1 hour...

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Abstract

The present invention discloses a carbon material used for a lithium-sulfur battery and preparation thereof, and applications. The method comprises the following steps: taking a metal salt and an organic ligand as raw materials, preparing and obtaining a metal organic framework (MOF) nano-wall array and growing the nano-wall array on a substrate; and making a carbon nano-tube interwoven porous nano-wall array carbon material via programmed heating carbonization or heating carbonization and chemical vapor deposition (CVD). The carbon nano-tube interwoven porous nano-wall array carbon material is taken as a positive electrode material of the lithium-sulfur battery, the carbon material shows great advantages in the fields of electronic transmission and ion transmission, and the carbon material has a good application prospect.

Description

technical field [0001] The invention relates to a carbon nanotube interwoven porous nano-wall array carbon material for a lithium-sulfur battery. Background technique [0002] Lithium-ion batteries are the secondary batteries with the highest commercial energy density at present, but subject to the constraints of the "deintercalation" theory, their actual energy density is less than 250Wh kg -1 , It is far from meeting people's demand for 500km battery life of electric vehicles. Lithium-sulfur batteries are based on the redox reaction mechanism of multi-electron gain and loss, and the theoretical energy density is as high as 2600Wh kg -1 . At the same time, the active substance sulfur has the advantages of high natural abundance, low cost, low toxicity, and environmental friendliness. Therefore, lithium-sulfur batteries are considered to be one of the new secondary batteries that can replace lithium-ion batteries and have good application prospects. [0003] Cathode mater...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/052
CPCY02E60/10
Inventor 张洪章张华民杨晓飞于滢李先锋陈雨晴
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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