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Method for preparing sulfur coated selenium hollow nanotube

A nanotube and selenium nanotechnology is applied in the field of preparing sulfur-coated selenium hollow nanotubes, which can solve the problems of insufficient Li+ diffusion and electrical conductivity, selenium cannot fully provide theoretical capacity, fast capacity decay, etc., so as to improve the mass ratio. The effect of low capacity, good crystallinity and repeatability, and simple preparation method

Inactive Publication Date: 2018-11-13
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This dissolution and shuttling effect leads to fast capacity fading, poor cycle performance, and low Coulombic efficiency
A large amount of selenium cannot fully provide the theoretical capacity of the cycle, and the utilization rate is low
In addition, although the conductivity of selenium is much higher than that of sulfur, Li in the Li-Se system + Diffusion and conductivity are still not outstanding enough

Method used

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  • Method for preparing sulfur coated selenium hollow nanotube
  • Method for preparing sulfur coated selenium hollow nanotube
  • Method for preparing sulfur coated selenium hollow nanotube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Dissolve 1 gram of selenium powder and 5 grams of sodium sulfite in 80 milliliters of water, stir at 75 degrees for 24 hours to form a uniform sodium selenosulfite solution; take out 4 milliliters and add to 45 milliliters containing 1 gram of non-ionic surfactant polyoxyethylene In the solution of lauryl ether and 60 microliters of acetic acid, after ultrasonication and aging, hexagonal selenium nanotubes were obtained by centrifugal washing; 0.05 grams of selenium nanotubes were dissolved in 28 milliliters of 0.1 mol / liter dilute hydrochloric acid for 10 Minutes; Dissolve 2 grams of sublimed sulfur in 10 milliliters of ethylenediamine to form a thiamine solution, slowly drop 2 milliliters of the thiamine solution into the acidic solution of selenium nanotubes, stir vigorously for 15 minutes under airtight conditions, filter, water and After washing with ethanol three times alternately, transfer to a drying oven at 60°C for 12 hours. The mass ratio of sulfur to seleniu...

Embodiment 2

[0025] Dissolve 1 gram of selenium powder and 5 grams of sodium sulfite in 80 milliliters of water, stir at 75 degrees for 24 hours to form a uniform sodium selenosulfite solution; take out 4 milliliters and add to 45 milliliters containing 1 gram of non-ionic surfactant polyoxyethylene In the solution of lauryl ether and 60 microliters of acetic acid, after ultrasonication and aging, hexagonal selenium nanotubes were obtained by centrifugal washing; 0.07 grams of selenium nanotubes were dissolved in 28 milliliters of 0.1 mol / liter dilute hydrochloric acid for 10 Minutes; Dissolve 2 grams of sublimed sulfur in 10 milliliters of ethylenediamine to form a thiamine solution, slowly drop 2 milliliters of the thiamine solution into the acidic solution of selenium nanotubes, stir vigorously for 15 minutes under airtight conditions, filter, water and After washing with ethanol three times alternately, transfer to a drying oven at 60°C for 12 hours. The mass ratio of sulfur to seleniu...

Embodiment 3

[0027] Dissolve 1 gram of selenium powder and 5 grams of sodium sulfite in 80 milliliters of water, stir at 75 degrees for 24 hours to form a uniform sodium selenosulfite solution; take out 4 milliliters and add to 45 milliliters containing 1 gram of non-ionic surfactant polyoxyethylene In the solution of lauryl ether and 60 microliters of acetic acid, after ultrasonication and aging, hexagonal selenium nanotubes were obtained by centrifugal washing; 0.08 grams of selenium nanotubes were dissolved in 28 milliliters of 0.1 mol / liter dilute hydrochloric acid for 10 Minutes; Dissolve 2 grams of sublimed sulfur in 10 milliliters of ethylenediamine to form a thiamine solution, slowly drop 2 milliliters of the thiamine solution into the acidic solution of selenium nanotubes, stir vigorously for 15 minutes under airtight conditions, filter, water and After washing with ethanol three times alternately, transfer to a drying oven at 60°C for 12 hours. The tubular structure is basically ...

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Abstract

The invention relates to a method for preparing a sulfur coated selenium hollow nanotube. The method comprises the following steps: dissolving selenium powder and sodium sulfite into water, controlling the temperature, stirring so as to obtain a uniform seleno-sodium sulfite solution, putting into a solution with a nonionic surfactant, carrying out ultrasonic treatment, aging, carrying out centrifugal washing so as to obtain selenium nanotubes of a hexagonal system, dissolving the selenium nanotubes into diluted hydrochloric acid, carrying out ultrasonic treatment, dissolving sublimed sulfur into ethidene diamine so as to obtain a sulfuric amino solution, slowly dropping the sulfuric amino solution into the solution, violently stirring under a sealed condition, filtering, washing with water and ethanol, and drying in a drying tank, thereby obtaining a product. Compared with the prior art, the method is capable of preparing the sulfur coated selenium hollow nanotube which has a diameterof about 500 nanometers and a length of about 5-10 micrometers, is good in crystallization and repeatability, can be applied to energy storage such as lithium-sulfur batteries, and is an excellent energy storage material.

Description

technical field [0001] The invention relates to a method for preparing energy storage device materials, in particular to a method for preparing hollow nanotubes coated with sulfur and selenium. Background technique [0002] A chemical power source is a device that can realize mutual conversion between electrical energy and chemical energy, and is an important medium that can make more rational use of energy. Lithium-ion batteries have excellent properties such as high working voltage, high energy density, low self-discharge rate, long cycle life, good safety performance and no memory effect. As a next-generation metal battery, lithium-sulfur (Li-S) batteries have attracted great attention due to their nontoxicity, low cost, high theoretical capacity, and energy density. Despite these advantages, Li-S batteries still have certain disadvantages, such as the insulating properties of sulfur and the dissolution of intermediate polysulfides during cycling, which lead to the redox...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M10/052B82Y40/00
CPCB82Y40/00H01M4/366H01M4/38H01M10/052Y02E60/10
Inventor 杨金虎郝天姿茹佳佳贺婷陈炳杰
Owner TONGJI UNIV
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