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Preparation method of indole-modified carbon sulfur-coated and compound lithium sulfur battery anode material

A lithium-sulfur battery and cathode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of unfavorable high-rate performance of batteries, poor mechanical stability of electrodes, and large volume changes, so as to improve electrochemical power Chemical properties, reduced electrode polarization, uniform particle size

Inactive Publication Date: 2015-04-15
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are three main problems in lithium-sulfur batteries: (1) Li-polysulfur compounds dissolve in the electrolyte; (2) Sulfur, as a non-conductive substance, has very poor conductivity, which is not conducive to the high rate performance of the battery; (3) Sulfur in During the charge and discharge process, the volume change is very large, resulting in poor mechanical stability of the electrode

Method used

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  • Preparation method of indole-modified carbon sulfur-coated and compound lithium sulfur battery anode material
  • Preparation method of indole-modified carbon sulfur-coated and compound lithium sulfur battery anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: Preparation of hollow carbon ball precursor

[0027] Dissolve 2 g of glucose in 100 mL of deionized water, stir to dissolve and introduce it into a reactor with a total capacity of 150 mL. Then add 10 g of spherical aluminum powder with a purity of 99.99% and a particle size of 1 to 5 microns, add magnets, and seal the reactor. The reaction kettle was placed in an oil bath at 250°C, and the reaction kettle was taken out after 2 hours of magnetic stirring and reaction. After the reactor is cooled to room temperature, open the reactor and centrifuge to obtain a brown or black solid powder sample (hollow carbon ball precursor).

Embodiment 2

[0028] Example 2: Carbonization of precursors

[0029] Dissolve 5 g of sucrose in 100 mL of deionized water, stir to dissolve, and introduce it into a reactor with a total capacity of 150 mL. Then add 10 g of spherical aluminum powder with a purity of 99.99% and a particle size of 5-10 microns, add magnets and seal the reactor. The reaction kettle was placed in an oil bath at 250°C, and the reaction kettle was taken out after 4 hours of magnetic stirring. After the reactor is cooled to room temperature, open the reactor and take out the filtered product. The product is in the form of brown or black solid powder, washed with water and ethanol, centrifuged, dried under vacuum at 40℃, and heated to 500℃ under nitrogen atmosphere, constant temperature Carbonize for 5 hours.

Embodiment 3

[0030] Example 3: Preparation of hollow carbon balls

[0031] Dissolve 10 g of starch in 100 mL of deionized water, stir to dissolve, and introduce it into a reactor with a total capacity of 150 mL. Then add 10 g of spherical aluminum powder with a purity of 99.99% and a particle size of 5-10 microns, add magnets and seal the reactor. The reaction kettle was placed in an oil bath at 250°C, and the reaction kettle was taken out after 8 hours of magnetic stirring and reaction. After the reaction kettle is cooled to room temperature, the reaction kettle is opened, and the filtered product is taken out. The product state is brown or black solid powder, washed with water and ethanol, and centrifuged. After vacuum drying at 40°C in a tube furnace, the temperature was raised to 600°C under the protection of a nitrogen atmosphere, and the temperature was carbonized for 3 hours. After cooling to room temperature, take out the sample and treat it with 1 wt% dilute hydrochloric acid at ro...

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Abstract

The invention relates to the technology of batteries, and aims at providing a preparation method of indole-modified carbon sulfur-coated and compound lithium sulfur battery anode material. The method comprises the following steps: reacting carbon source material, deionized water and spherical aluminum powder at the temperature of 250 DEG C, and performing centrifugal separation to obtain a brown or black solid powder sample; washing, performing centrifugal separation, drying, and then carbonizing at a constant temperature in nitrogen; performing acid treatment or alkaline treatment after cooling; washing and performing vacuum drying after filtering so as to obtain hollow carbon spheres; reacting the hollow carbon spheres, indole and transition metals at the temperature of 100-300 DEG C, performing vacuum drying after filtering and washing so as to obtain hollow carbon spheres modified by indole and transition metals; grinding and mixing with elemental sulfur, placing in a reactor, vacuumizing and heating to complete sulfur storage process through reactions, and cooling to room temperature. Organic electrolytes are safe in the application of battery; the anode material has good electrode reaction reversibility and good chemical stability and heat stability, and is low in cost, easy to prepare and free from pollution.

Description

Technical field [0001] The invention relates to a lithium-sulfur battery positive electrode material and a preparation method thereof, in particular to forming a cavity in a hollow carbon ball to store sulfur. The carbon shell layer is composed of nano carbon balls and is modified by indole transition metal to be formed on the nano carbon balls Nitrogen-carbon or transition metal compounds prevent sulfur from dissolving out of hollow carbon spheres to obtain a high-capacity lithium-sulfur battery cathode material. Background technique [0002] Lithium-ion batteries have the advantages of light weight, large capacity, and no memory effect, so they have been widely used. Many digital devices now use lithium-ion batteries as power sources. The energy density of lithium-ion batteries is very high, and its capacity is 1.5 to 2 times that of nickel-hydrogen batteries of the same weight, and its advantages such as low self-discharge rate and no toxic substances are important reasons fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/62H01M4/1397H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 刘宾虹李洲鹏
Owner ZHEJIANG UNIV
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