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Method for preparing carbon cloth/tin flexible electrode material for negative electrode of sodium ion battery

A sodium-ion battery and flexible electrode technology, applied in battery electrodes, secondary batteries, electrode carriers/collectors, etc., can solve problems such as reducing battery efficiency and cycle performance, material powdering and falling off, and affecting the practical application of materials. Excellent electrochemical performance, increase energy density, and improve the effect of electrochemical performance

Inactive Publication Date: 2019-05-03
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the preparation of traditional negative electrode materials, the active material is usually mixed with a conductive agent and a binder in a certain proportion and then spread on the copper foil. However, alloy materials have a large volume effect, which will cause the material to change from The powdering and falling off of the copper foil reduces the efficiency and cycle performance of the battery, which greatly affects the practical application of this type of material

Method used

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  • Method for preparing carbon cloth/tin flexible electrode material for negative electrode of sodium ion battery
  • Method for preparing carbon cloth/tin flexible electrode material for negative electrode of sodium ion battery
  • Method for preparing carbon cloth/tin flexible electrode material for negative electrode of sodium ion battery

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Embodiment 1

[0025] 1) Weigh 1.12g of PVP (molecular weight: 30000) and dissolve it in 20mL of ethanol, then add 0.47g of SnCl 2 2H 2 O to get the mixture (Sn 2+ The concentration is 0.01mol L -1 ), put the mixture into a microwave-ultrasonic synthesis extraction reaction apparatus (Shanghai Xinyi Microwave Chemical Technology Co., Ltd., Uwave-1000 type), turn on the ultrasonic mode, and ultrasonically 30min to make the PVP molecules and Sn 2+ After full effect, get solution A, add 5cm×5cm carbon cloth, and turn on the magnetic stirring device, control the rotor speed in solution A to 400r / min, stir for 1min;

[0026] 2) Add 5ml of hydrazine hydrate to solution A to obtain solution B, continue to stir for 5 minutes, take out the carbon cloth after stirring, and dry the carbon cloth in a vacuum drying oven at 60°C for 12 hours to obtain a carbon cloth / tin flexible electrode material ;

[0027] 3) Use the prepared carbon cloth / tin composite material as the negative electrode material of ...

Embodiment 2

[0029] 1) Weigh 1.12g of PVP (molecular weight: 30,000) and dissolve it in 20mL of ethanol, then add 0.64g of SnCl 2 2H 2 O to get the mixture (Sn 2+ The concentration is 0.013mol L -1 ), pour the mixture into a microwave-ultrasonic synthesis extraction reaction apparatus (Shanghai Xinyi Microwave Chemical Technology Co., Ltd., Uwave-1000 type), turn on the ultrasonic mode, and ultrasonically 30min to make PVP molecules and Sn 2+ After full effect, get solution A, add 4cm × 4cm carbon cloth, and turn on the magnetic stirring device, control the rotor speed in solution A to 500r / min, stir for 1min;

[0030] 2) Add 10ml of hydrazine hydrate to solution A to obtain solution B, continue to stir for 5 minutes, take out the carbon cloth after stirring, and dry the carbon cloth in a vacuum drying oven at 60°C for 12 hours to obtain a carbon cloth / tin flexible electrode material ;

[0031] 3) Use the prepared carbon cloth / tin composite material as the negative electrode material o...

Embodiment 3

[0036] 1) Weigh 2.24g of PVP (molecular weight: 30,000) and dissolve it in 50mL of ethanol, then add 0.72g of SnCl after dissolving 2 2H 2 O to get the mixture (Sn 2+ The concentration is 0.04mol L -1 ), pour the mixture into a microwave-ultrasonic synthesis extraction reaction apparatus (Shanghai Xinyi Microwave Chemical Technology Co., Ltd., Uwave-1000 type), turn on the ultrasonic mode, and ultrasonically 20min to make PVP molecules and Sn 2+ After full effect, obtain solution A, and turn on the magnetic stirring device, control the rotor speed in solution A to 800r / min, and stir for 10min;

[0037]2) Add 10ml of hydrazine hydrate to solution A to obtain solution B, continue to stir for 10 minutes, take out the carbon cloth after stirring, and dry the carbon cloth in a vacuum drying oven at 60°C for 6 hours to obtain a carbon cloth / tin flexible electrode material ;

[0038] 3) Use the prepared carbon cloth / tin composite material as the negative electrode material of the...

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Abstract

The invention provides a method for preparing a carbon cloth / tin flexible electrode material for a negative electrode of a sodium ion battery. The method comprises the steps of (1) preprocessing carbon cloth, cutting the carbon cloth, and anodizing the carbon cloth in a hydrothermal electrophoresis device to increase an active functional group on the surface of the carbon cloth such that metal ions are more easily attached to grow, (2) dissolving polyvinylpyrrolidone in ethanol to obtain a solution A1, add SnCl2-2H2O to the solution A1, then ultrasonically processing to obtain a solution A2, adding the processed carbon cloth in step (1) into the solution A2, and stirring at a normal temperature, wherein the concentration of Sn2+ in solution A2 is 0.01-0.21 mol L-1, and (3) adding a solution of the reducing agent into the stirred solution A2, reducing Sn2+ on the carbon cloth to a Sn element by the reducing agent, and then performing vacuum drying on the obtained carbon cloth to obtainthe carbon cloth / tin flexible electrode material. The material has the advantages of bendable folding, simple assembly and no need for a current collector.

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 preparation method of carbon cloth / tin flexible electrode materials for sodium ion battery negative electrodes. Background technique [0002] At present, carbon graphitized negative electrode materials are mainly used for the negative electrode of sodium ion batteries, but the sodium storage capacity of carbon-based negative electrode materials is not high, and the preparation conditions are complicated. Therefore, it is of great significance to develop new anode materials with high capacity and high rate and simple preparation method. In the study of negative electrode materials, it was found that metals or alloy materials that can form alloys with sodium, such as Sn, Si, Al, Sb, etc., have a theoretical capacity much larger than that of graphite, which has aroused widespread concern in the battery material indust...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/66H01M10/054
CPCY02E60/10
Inventor 黄剑锋刘梦宇李嘉胤曹丽云赵怡星马萌
Owner SHAANXI UNIV OF SCI & TECH
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