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

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

Inactive Publication Date: 2013-09-18
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 sphere precursor

[0027] Dissolve 2 g of glucose in 100 mL of deionized water, stir and dissolve, and then 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, and seal the reaction kettle after adding magnets. 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. After the reactor was cooled to room temperature, the reactor was opened and centrifuged to obtain a brown or black solid powder sample (hollow carbon sphere precursor).

Embodiment 2

[0028] Example 2: Precursor carbonization

[0029] Dissolve 5 g of sucrose in 100 mL of deionized water, stir and dissolve, and then 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 to 10 microns, and seal the reaction kettle after adding magnets. 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 reaction kettle is cooled to room temperature, open the reaction kettle, take out the filtered product, the product is in the form of brown or black solid powder, washed with water and ethanol, centrifuged, dried in vacuum at 40°C and heated to 500°C under the protection of nitrogen atmosphere, constant temperature Carbonize for 5 hours.

Embodiment 3

[0030] Example 3: Preparation of hollow carbon spheres

[0031] 10 g of starch was dissolved in 100 mL of deionized water, stirred and dissolved, and introduced 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 to 10 microns, and seal the reaction kettle after adding magnets. 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. After the reaction kettle is cooled to room temperature, open the reaction kettle, take out the filtered product, the product state is brown or black solid powder, wash with water and ethanol respectively, and centrifuge. After vacuum drying at 40 °C in a tube furnace, the temperature was raised to 600 °C under the protection of nitrogen atmosphere, and carbonized at constant temperature for 3 hours. After cooling to room temperature, the sample was taken out, and treated with 1 wt% di...

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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 hollow carbon spheres to store sulfur. A nitrogen-carbon or transition metal compound prevents the dissolution of sulfur from hollow carbon spheres, and obtains a method for 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, its capacity is 1.5 to 2 times that of nickel-metal hydride batteries of the same weight, and its advantages such as low self-discharge rate and no toxic substances are important reasons for its wide application. In 1990, Nagoura and others in Japan developed a negative electrode with petroleum cok...

Claims

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Application Information

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