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A high-performance porous carbon-tin oxide monodisperse composite ball negative electrode material and its preparation method and application

A technology of tin oxide single and negative electrode materials, applied in the direction of battery electrodes, structural parts, electrical components, etc., can solve the problems of difficult structure and large polarization, and achieve the effect of improving electrical conductivity, reducing polarization, and good industrialization prospects

Active Publication Date: 2022-04-12
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Until now, the SnO 2 It is the mainstream trend to prepare a composite structure with carbon to improve the negative electrode material of lithium / sodium ion battery, but its preparation and synthesis method is mostly a two-step method, that is, the preparation of SnO 2 materials, followed by carbon composites, and in situ preparation of SnO by a one-step method 2 - Carbon composite structure is more difficult
In addition, the currently prepared SnO 2 - Carbon composites are mostly agglomerated structures, and the polarization is large during the charge and discharge process
[0005] In situ preparation of carbon-tin oxide monodisperse nanocomposite spheres by one-step method

Method used

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  • A high-performance porous carbon-tin oxide monodisperse composite ball negative electrode material and its preparation method and application
  • A high-performance porous carbon-tin oxide monodisperse composite ball negative electrode material and its preparation method and application
  • A high-performance porous carbon-tin oxide monodisperse composite ball negative electrode material and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0033] Disperse 0.1 mL of pyrrole in 100 mL of deionized water, stir ultrasonically to disperse evenly (no oil droplets), add 0.2 g of P123 and 2 nm monodisperse SiO 2 1 g of the gel was dispersed by ultrasonic stirring until it was completely dissolved; in the above mixed aqueous solution, add 0.5 g of SnCl 2 , ultrasonically stirred for 15 min; then magnetically stirred in an ice bath for 20 min. Ultrasonic dispersion, stirring evenly; another preparation containing 0.5 g ammonium persulfate aqueous solution 10 mL, pour it into the above solution, ice bath for 12 h. After the reaction, filter with suction, wash with deionized water for 3 to 5 times, and vacuum dry at 70°C for 3 to 5 hours to prepare the precursor monodisperse composite balls. The obtained composite was heat-treated at 500 °C for 12 h under Ar atmosphere. High-performance porous carbon-tin oxide monodisperse composite spheres were prepared by treating with 30% HF acid aqueous solution for 0.5 h.

[0034] A...

Embodiment 2

[0036] Disperse 0.2 mL of pyrrole in 100 mL of deionized water, disperse evenly (without oil droplets) under ultrasonic stirring, add 0.5 g of P123 and 5 nm monodisperse SiO 2 2 g of the gel was dispersed with ultrasonic stirring until it was completely dissolved; in the above mixed aqueous solution, 0.5 g of SnCl was added 2 , ultrasonically stirred for 15 min; then magnetically stirred in an ice bath for 20 min. Ultrasonic dispersion, stirring evenly; another preparation containing 0.8 g ammonium persulfate aqueous solution 10 mL, pour it into the above solution, ice bath for 12 h. After the reaction, filter with suction, wash with deionized water for 3 to 5 times, and vacuum dry at 70°C for 3 to 5 hours to prepare the precursor monodisperse composite balls. The obtained composite was heat-treated at 550 °C for 6 h under Ar atmosphere. High-performance porous carbon-tin oxide monodisperse composite spheres were prepared by treating with 10% HF acid aqueous solution for 24 ...

Embodiment 3

[0039] Disperse 0.2 mL of pyrrole in 100 mL of deionized water, disperse evenly (no oil droplets) under ultrasonic stirring, add 0.3 g of P123 and 10 nm monodisperse SiO 2 10 g of the gel was dispersed by ultrasonic stirring until it was completely dissolved; in the above mixed aqueous solution, 1 g of SnCl was added 2 , ultrasonically stirred for 15 min; then magnetically stirred in an ice bath for 20 min. Ultrasonic dispersion, stirring evenly; another preparation containing 0.8 g ammonium persulfate aqueous solution 10 mL, pour it into the above solution, ice bath for 12 h. After the reaction, filter with suction, wash with deionized water for 3 to 5 times, and vacuum dry at 70°C for 3 to 5 hours to prepare the precursor monodisperse composite balls. The obtained composite was heat-treated at 600 °C for 2 h under Ar atmosphere. High-performance porous carbon-tin oxide monodisperse composite spheres were prepared by treating with 20% HF acid aqueous solution for 6 h.

[0...

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Abstract

The invention discloses a high-performance porous carbon-tin oxide monodisperse composite ball negative electrode material and its preparation method and application. P123 and monodisperse SiO are added to the aqueous solution of pyrrole or aniline monomer 2 , SnCl 2 After magnetic stirring in an ice bath, an aqueous solution of ammonium persulfate was added to initiate a copolymerization reaction, and finally a spherical composite carbon-tin oxide structure composite material with monodisperse characteristics and an oxygen vacancy-rich structure was prepared in one step through high temperature treatment. According to the characteristics of the lithium battery negative electrode material in the charge-discharge cycle, the present invention designs and prepares a carbon layer and tin oxide blended porous composite spherical structure, which is basically uniform and monodisperse, which is beneficial to eliminate the polarization of the electrode material, and simultaneously tin oxide and carbon material The homogeneous recombination of the electrode material is beneficial to reduce or reduce the volume effect of the electrode material, and its abundant oxygen vacancies and uniform porous structure can effectively improve the electrochemical performance of the electrode material.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for lithium / sodium ion batteries, in particular to a high-performance porous carbon-tin oxide monodisperse composite spherical negative electrode material and its preparation method and application. Background technique [0002] Lithium / sodium ion batteries have the advantages of high open circuit voltage, high energy density, long service life, no memory effect, less pollution, and low self-discharge rate. It is the most ideal power supply for portable electronic equipment and electric vehicles. Although graphite, the negative electrode material of traditional lithium / sodium ion batteries, has good cycle stability and high cost performance, due to its low charge-discharge specific capacity and no advantage in volume specific capacity, it is difficult to meet the needs of power systems, especially electric vehicles and hybrid electric vehicles. Requirements for higher battery...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62
CPCY02E60/10
Inventor 张文惠岳鹿浦旭清沈超周旭聪冉雪凯徐琪关荣锋
Owner YANCHENG INST OF TECH
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