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Preparation method for multi-pore-passage hollow carbon nanosphere compound electrode material

A carbon nanosphere and composite electrode technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problem of low capacity retention rate of lithium-sulfur batteries, and achieve the goal of improving capacity retention rate, enhancing conductivity, and reducing electrode structure changes. Effect

Inactive Publication Date: 2019-03-12
CH AUTO TECH CORP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of this, the present invention proposes a method for preparing a porous hollow carbon nanosphere composite electrode material, aiming to solve the problem of low capacity retention of existing lithium-sulfur batteries

Method used

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  • Preparation method for multi-pore-passage hollow carbon nanosphere compound electrode material
  • Preparation method for multi-pore-passage hollow carbon nanosphere compound electrode material
  • Preparation method for multi-pore-passage hollow carbon nanosphere compound electrode material

Examples

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Effect test

Embodiment 1

[0025] Pour 75ml of ethanol and 25ml of deionized water into a beaker, add 6ml of tetraethyl orthosilicate, and keep stirring. After the solution is uniform, slowly add 3ml of ammonia water, and stir at room temperature for 2 hours. The resulting product was subjected to high-speed centrifugation, and continuously washed with deionized water and ethanol until the pH of the solution was 7, and the product was dried in a vacuum oven at 60°C for 24 hours to obtain SiO 2 template;

[0026] At room temperature, 1.5g SiO 2 Disperse the template into a mixed solution of deionized water and ethanol with a volume ratio of 1:1, then add an appropriate amount of CTAB and stir evenly; add 3g terephthalaldehyde and 3g hydroquinone to the above suspension, and continue stirring for a period of time , adding 0.9 g of ammonia water, and then continuously stirring at 60° C. for 1 h, then centrifuging the product with a high-speed centrifuge, and washing it twice with deionized water. The was...

Embodiment 2

[0029] Pour 70ml of ethanol and 20ml of deionized water into a beaker, add 5ml of ethyl orthosilicate, and keep stirring. After the solution is uniform, slowly add 2.5ml of ammonia water, and stir at room temperature for 2 hours. The resulting product was subjected to high-speed centrifugation, and continuously washed with deionized water and ethanol until the pH of the solution was 7, and the product was dried in a vacuum oven at 65°C for 24 hours to obtain SiO 2template;

[0030] At room temperature, 4gSiO 2 Disperse the template into a mixed solution of deionized water and ethanol with a volume ratio of 1:1.5, then add an appropriate amount of CTAB and stir evenly; add 8g terephthalaldehyde and 8g hydroquinone to the above suspension, and continue stirring for a period of time , adding 3 g of ammonia water, then centrifuging the product with a high-speed centrifuge after continuous stirring at 55° C. for 1 h, and washing twice with deionized water. The washed product was ...

Embodiment 3

[0033] Pour 75ml of ethanol and 25ml of deionized water into a beaker, add 8ml of tetraethyl orthosilicate, and keep stirring. After the solution is uniform, slowly add 4ml of ammonia water, and stir at room temperature for 2 hours. The resulting product was subjected to high-speed centrifugation, and continuously washed with deionized water and ethanol until the pH of the solution was 7, and the product was dried in a vacuum oven at 60°C for 24 hours to obtain SiO 2 template;

[0034] At room temperature, 1.2gSiO 2 Disperse the template into a mixed solution of deionized water and ethanol with a volume ratio of 1:1, then add an appropriate amount of CTAB and stir evenly; add 2g terephthalaldehyde and 2g hydroquinone to the above suspension, and continue stirring for a period of time , adding 0.5 g of ammonia water, and then continuously stirring at 60° C. for 1 h, centrifuging the product with a high-speed centrifuge, and washing twice with deionized water. The washed produ...

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Abstract

The invention provides a preparation method for a multi-pore-passage hollow carbon nanosphere compound electrode material. The preparation method has a main technical scheme that a SiO2 porous micro-sphere is taken as a template, hydroquinone, 1, 4-phthalaldehyde and the like generate polyreaction to prepare the multi-pore-passage hollow carbon nanosphere compound electrode material, and through afusion diffusion method, the multi-pore-passage hollow carbon nanosphere compound material is subjected to sulfur filling compounding to obtain a porous hollow carbon sphere / S compound electrode material. The hollow structure of the multi-pore-passage hollow carbon nanosphere compound electrode material prepared by the preparation method can provide a buffer space for volumetric strain of elemental sulfur in a lithium-sulfur battery in the charging and discharging process so as to be favorable for enhancing the electrical conductivity of the positive plate of the lithium-sulfur battery, andthe buffer space lowers an electrode structure change caused by the volume change of the elemental sulfur to a certain degree so as to be favorable for improving the capacity retention ratio of the lithium-sulfur battery.

Description

technical field [0001] The invention relates to the technical field of lithium-sulfur ion batteries, in particular to a method for preparing a porous hollow carbon nanosphere composite electrode material. Background technique [0002] As a rechargeable secondary battery with light weight, environmental protection and high energy density, lithium-ion battery has been widely used in all walks of life in society. But at the same time, the rapid development of portable electronic equipment, energy, communication, transportation, military, aerospace and other fields has put forward higher and higher application requirements for the energy density of lithium-ion batteries. However, the existing commercial lithium-ion batteries are limited to the theoretical specific capacity of the positive electrode material itself, and the energy density is limited, so these requirements cannot be met for the time being. In recent years, lithium-sulfur batteries have become a research hotspot w...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/362H01M4/38H01M4/625H01M4/628H01M10/052Y02E60/10
Inventor 王克坚张奎博
Owner CH AUTO TECH CORP CO LTD
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