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Preparation method of SnO2/carbon fabric composite material for sodium ion battery negative electrode

A sodium-ion battery and composite material technology, which is applied in the field of preparation of SnO2/carbon cloth composite materials for the negative electrode of sodium-ion batteries, can solve the problems of reducing battery efficiency and cycle performance, material powdering and falling off, and affecting the practical application of materials. High repeatability, short cycle, significant scientific effect

Inactive Publication Date: 2019-05-21
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, SnO2 has a large volume effect, which leads to the powdering and falling off of the material during charge and discharge, which reduces the efficiency and cycle performance of the battery, and greatly affects the practical application of this type of material.

Method used

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  • Preparation method of SnO2/carbon fabric composite material for sodium ion battery negative electrode
  • Preparation method of SnO2/carbon fabric composite material for sodium ion battery negative electrode
  • Preparation method of SnO2/carbon fabric composite material for sodium ion battery negative electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) Ultrasonic cleaning of 3×3 cm hydrophilic carbon cloth in ethanol and deionized water for 3 h each, and then placing the carbon in a muffle furnace from room temperature to 480 °C at a heating rate of 10 °C / min for air oxidation Treat for 10 minutes to increase the activity of the carbon cloth surface and make it easier to attach metal without affecting the mechanical properties of the carbon cloth;

[0026] 2) 0.524g of SnCl 2 2H 2 O was dissolved in 25mL of deionized water and 25ml of ethylene glycol mixed solvent to obtain solution A1, then ultrasonic treatment with ultrasonic power of 100W for 10min, stirring evenly to obtain a uniform mixed solution;

[0027] 3) Transfer the mixed solution obtained in step 2) and the pretreated carbon cloth to a polytetrafluoroethylene hydrothermal kettle, control the filling degree to 30%, and then place the polytetrafluoroethylene hydrothermal kettle in a homogeneous reaction In a device (Yantai Keli Chemical Equipment Co., ...

Embodiment 2

[0030] 1) Ultrasonic cleaning of a 5×5 cm hydrophilic carbon cloth in ethanol and deionized water for 6 h each, and then placing the carbon in a muffle furnace from room temperature to 400 °C at a heating rate of 10 °C / min for air oxidation Treat for 10 minutes to increase the activity of the carbon cloth surface and make it easier to attach metal without affecting the mechanical properties of the carbon cloth;

[0031] 2) 0.524g of SnCl 2 2H 2 O was dissolved in 40mL of deionized water and 10ml of ethylene glycol mixed solvent to obtain solution A1, then ultrasonically treated with ultrasonic power of 100W for 10min, and stirred evenly to obtain a uniform mixed solution;

[0032] 3) Transfer the mixed solution obtained in step 2) and the pretreated carbon cloth to a polytetrafluoroethylene hydrothermal kettle, control the filling degree to 50%, and then place the polytetrafluoroethylene hydrothermal kettle in a homogeneous reaction In the apparatus (Yantai Keli Chemical Equ...

Embodiment 3

[0038] 1) Ultrasonic cleaning of 4×4 cm hydrophilic carbon cloth in ethanol and deionized water for 4 h twice, and then the carbon was placed in a muffle furnace from room temperature to 360 °C at a heating rate of 10 °C / min for air oxidation Treat for 5 minutes to increase the activity of the carbon cloth surface and make it easier to attach metal without affecting the mechanical properties of the carbon cloth;

[0039] 2) 1.08g of SnCl 2 2H 2 O was dissolved in 35mL of deionized water and 15ml of ethylene glycol mixed solvent to obtain solution A1, then ultrasonic treatment with ultrasonic power of 100W for 20min, stirring evenly to obtain a uniform mixed solution;

[0040] 3) Transfer the mixed solution obtained in step 2) and the pretreated carbon cloth to a polytetrafluoroethylene hydrothermal kettle, control the filling degree to 50%, and then place the polytetrafluoroethylene hydrothermal kettle in a homogeneous reaction In the apparatus (Yantai Keli Chemical Equipmen...

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Abstract

The invention relates to a preparation method of a SnO2 / carbon fabric composite material for a sodium ion battery negative electrode. The SnO2 / carbon fabric composite material with a grain size being0.5-1 micrometer and a uniform solid-sphere structure is prepared by taking water as a solvent and SnCl<2>.2H2O as a tin source and by a hydrothermal method, the SnO2 / carbon fabric composite materialis used as a negative electrode material to be assembled to form a sodium ion battery. Since SnO2 has relatively high theoretical capacity, the conductivity of the negative electrode material can be improved by taking a carbon fabric as a matrix; and moreover, SnO2 is directly grown on the carbon fabric, a binding agent and a conductive agent are not needed to be pasted, the active substance dutyratio is improved, the energy density is large, and thus, the SnO2 / carbon fabric composite material shows relatively good electrochemical performance. The preparation process is simple in process, theSnO2 / carbon fabric composite material low in reaction temperature, high in repeatability, short in period and low in energy consumption, is suitable for demand of large-scale production and has remarkable scientific significance to the application aspect of the sodium ion battery, and the production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of alloy negative electrode materials for sodium ion batteries, and in particular relates to a kind of SnO used for negative electrodes of sodium ion batteries 2 / The preparation method of carbon cloth composite material. Background technique [0002] With the development of bendable and foldable electronic devices, developing flexible batteries with high energy density is one of the current research hotspots. The focus of developing flexible batteries is to develop high-energy-density electrode materials without binders and current collectors. At present, carbon graphitized negative electrode materials are mainly used for sodium ion battery negative electrodes. Although carbon graphitized negative electrode materials have good cycle stability, the capacity is only 250-300mAh / g theoretical capacity. In the study of negative electrode materials, the theoretical capacity of SnO2 in sodium ion batteries reach...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/587H01M4/66H01M10/054
CPCY02E60/10
Inventor 黄剑锋刘梦宇赵怡星李嘉胤曹丽云马萌
Owner SHAANXI UNIV OF SCI & TECH
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