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Preparation method of sodion energy storage graphene/sodium titanate non-woven fabric material

A technology of sodium titanate and graphene, which is applied in the field of sodium ion energy storage, can solve the problems of hysteresis in electrochemical reaction kinetics and poor mechanical stability of flexible negative electrode materials, and achieve high power/energy density output characteristics and enhanced mechanical properties , Improve the effect of reaction kinetics

Active Publication Date: 2019-06-14
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to propose a method for preparing a graphene / sodium titanate non-woven fabric material for sodium ion energy storage in view of the hysteresis of electrochemical reaction kinetics and poor mechanical stability of flexible negative electrode materials

Method used

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  • Preparation method of sodion energy storage graphene/sodium titanate non-woven fabric material
  • Preparation method of sodion energy storage graphene/sodium titanate non-woven fabric material
  • Preparation method of sodion energy storage graphene/sodium titanate non-woven fabric material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Step 1: Measure the graphene oxide aqueous solution of 1 / 4 volume of the centrifuge tube and place it in the centrifuge tube, then add 1 / 6 volume of N, N-dimethylformamide to the centrifuge tube, and place it in the In the centrifuge, the rotation speed is 8000rpm, and the centrifugation time is 20min. After centrifugation, the supernatant is drawn out, and the bottom graphene oxide is retained. The above steps were repeated three times to finally obtain a GO / DMF solution with a concentration of 5 mg / mL.

[0041] Step 2: Get 0.4g (containing 3.14mmol TiO 2 ) titanium dioxide, placed in 5 mL of aqueous sodium hydroxide solution with a concentration of 0.1 mol / L, mechanically stirred for 1 hour, then placed in a reaction kettle for hydrothermal heating at a holding temperature of 180°C for a holding time of 36 hours to obtain sodium titanate;

[0042] Step 3: washing the sodium titanate material obtained in the previous step with deionized water and ethanol successively,...

Embodiment 2

[0048] In this example, the steps of preparing the graphene / sodium titanate non-woven sodium ion storage material by wet spinning method are the same as those in Example 1, except that different masses of sodium titanate are added. Finally, graphene / sodium titanate non-woven sodium ion storage materials with different flexibility are obtained;

[0049] Step 1: Measure the graphene oxide aqueous solution of 1 / 4 volume of the centrifuge tube and place it in the centrifuge tube, then add 1 / 6 volume of N, N-dimethylformamide to the centrifuge tube, and place it in the In the centrifuge, the rotation speed is 8000rpm, and the centrifugation time is 20min. After centrifugation, the supernatant is drawn out, and the bottom graphene oxide is retained. The above steps were repeated three times to finally obtain a GO / DMF solution with a concentration of 5 mg / mL.

[0050] Step 2: Get 0.4g (containing 3.14mmol TiO 2 ) titanium dioxide, placed in 5 mL of aqueous sodium hydroxide solution...

Embodiment 3

[0058] Step 1: Measure the graphene oxide aqueous solution of 1 / 4 volume of the centrifuge tube and place it in the centrifuge tube, then add 1 / 6 volume of N, N-dimethylformamide to the centrifuge tube, and place it in the In the centrifuge, the rotation speed is 8000rpm, and the centrifugation time is 20min. After centrifugation, the supernatant is drawn out, and the bottom graphene oxide is retained. The above steps were repeated three times to finally obtain a GO / DMF solution with a concentration of 5 mg / mL.

[0059] Step 2: Get 0.4g (containing 3.14mmol TiO 2 ) titanium dioxide, placed in 5 mL of aqueous sodium hydroxide solution with a concentration of 0.1 mol / L, mechanically stirred for 1 hour, then placed in a reaction kettle for hydrothermal heating at a holding temperature of 180°C for a holding time of 36 hours to obtain sodium titanate;

[0060] Step 3: washing the sodium titanate material obtained in the previous step with deionized water and ethanol successively,...

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Abstract

The invention relates to a preparation method of a sodion energy storage graphene / sodium titanate non-woven fabric material. The method comprises the following steps of: placing sodium titanate powderin graphene oxide / N,N-dimethyl formamide solution (GO / DMF) to obtain graphene oxide / sodium titanate / N,N-dimethyl formamide solution; injecting the obtained mixed solution into curing solution by an automatic injection machine at a uniform injection speed of 2 to 20ml / h, carrying out spinning according to a non-woven fabric structure, and drying an obtained graphene oxide / sodium titanate non-wovenfabric which is finally spun to have 2 to 10 layers at the room temperature; and then carrying out heat preservation in a container with hydrazine hydrate and finally, obtaining the graphene / sodium titanate non-woven fabric. According to the invention, the prepared graphene / sodium titanate non-woven fabric material is excellent in electrochemical performance, high in yield, low in price, convenient for industrial application, simple in synthesis method, non-toxic and harmless, and has the enormous potential in future portable and wearable energy storage products.

Description

technical field [0001] The invention belongs to new material preparation technology and is applied to the field of sodium ion energy storage, in particular to a method for preparing graphene / sodium titanate nonwoven fabric by applying wet spinning technology and chemical heat reduction treatment. Background technique [0002] With the development of society, people use more and more portable electronic devices such as smart phones, wearable sensors, intelligent robots, electronic watches, wireless earphones, etc., and their requirements for battery life are also increasing. . At the same time, considering the comfort and convenience of the human body, wearable energy storage devices such as flexible batteries, supercapacitors, and solar cells have broad application prospects. At present, the main energy storage devices on the market are still mainly lithium-ion batteries, but due to the increasingly scarce lithium resources, this brings opportunities and challenges for the ...

Claims

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Application Information

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IPC IPC(8): H01M4/1391H01M4/131H01M4/36H01M4/485H01M4/62H01M10/054H01G11/86H01G11/24H01G11/26H01G11/30H01G11/36H01G11/46H01G11/06
CPCY02E60/10
Inventor 王恭凯刘泽鑫张昕
Owner HEBEI UNIV OF TECH
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