Graphene-reinforced carbon-coated titanium manganese sodium phosphate microsphere electrode material and its preparation method and application

A technology of carbon-coated titanium manganese sodium phosphate and electrode materials, which is applied in the field of nanomaterials and electrochemistry, can solve the problems of reduced material ion diffusion rate, effective conductive network surface area, graphene agglomeration, uneven coating, etc., and achieves excellent electrochemical performance. properties, enhanced conductivity, and reduced dissolution effects

Active Publication Date: 2021-07-23
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these methods can achieve the purpose of coating, graphene is prone to agglomeration and stacking during the preparation process, resulting in uneven coating, which leads to a great reduction in the ion diffusion rate of the material and the surface area of ​​the effective conductive network.

Method used

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  • Graphene-reinforced carbon-coated titanium manganese sodium phosphate microsphere electrode material and its preparation method and application
  • Graphene-reinforced carbon-coated titanium manganese sodium phosphate microsphere electrode material and its preparation method and application
  • Graphene-reinforced carbon-coated titanium manganese sodium phosphate microsphere electrode material and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Add 10mmol citric acid powder, 5mmol manganese acetate powder, 15mmol sodium dihydrogen phosphate powder, 5mmol bis(2-hydroxypropionic acid) diammonium dihydroxide titanium into 100mL deionized water in turn, stir at room temperature for 30min to dissolve , add 0.01g graphene oxide and ultrasonically disperse for 30min;

[0028] 2) The solution obtained in step 1) is spray-dried. The spray-drying temperature is 160° C., the circulating air flow is 90%, and the sampling pump is 5%. The resulting product is put into a tube furnace for calcination. The calcination temperature is 600° C., and the calcination time is 4 hours, the calcination atmosphere is argon, and the heating rate is 3°C / min. The final calcined product is Na 3 MnTi(PO 4 ) 3 / C@rGO(600℃) microspheres;

[0029] 3) Graphene oxide is not added in 1), and other steps remain unchanged to obtain Na 3 MnTi(PO 4 ) 3 / C (600°C) microspheres.

[0030] With the product Na of this experiment invention 3 MnT...

Embodiment 2

[0035] 1) Add 10mmol citric acid powder, 5mmol manganese acetate powder, 15mmol sodium dihydrogen phosphate powder, 5mmol bis(2-hydroxypropionic acid) diammonium dihydroxide titanium into 100mL deionized water in turn, stir at room temperature for 30min to dissolve , add 0.01g graphene oxide and ultrasonically disperse for 30min.

[0036] 2) The solution obtained in step 1) is spray-dried. The spray-drying temperature is 160° C., the circulating air flow is 90%, and the sampling pump is 5%. The resulting product is put into a tube furnace for calcination. The calcination temperature is 600° C., and the calcination time is 4 hours, the calcination atmosphere is argon, and the heating rate is 3°C / min. The final calcined product is Na 3 MnTi(PO 4 ) 3 / C@rGO (600°C) microspheres.

[0037] 3) Adjust the calcination temperature in 2) to 550°C, and keep the other steps unchanged to obtain Na 3 MnTi(PO 4 ) 3 / C@rGO (550°C) microspheres.

[0038] With the product Na of this exp...

Embodiment 3

[0042]1) Add 10mmol citric acid powder, 5mmol manganese acetate powder, 15mmol sodium dihydrogen phosphate powder, 5mmol bis(2-hydroxypropionic acid) diammonium dihydroxide titanium into 100mL deionized water in turn, stir at room temperature for 30min to dissolve , add 0.05g graphene oxide and ultrasonically disperse for 30min.

[0043] 2) The solution obtained in step 1) is spray-dried, the spray-drying temperature is 200°C, the circulating air flow is 90%, the sampling pump is 5%, and the resulting product is put into a tube furnace for calcination, the calcination temperature is 600°C, and the calcination time is 4 hours, the calcination atmosphere is argon, and the heating rate is 3°C / min. The final calcined product is Na 3 MnTi(PO 4 ) 3 @C (600°C) microspheres.

[0044] With the product Na of this experiment invention 3 MnTi(PO 4 ) 3 / C@rGO (600°C) microspheres as an example, after the electrochemical performance test, the constant current charge and discharge tes...

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Abstract

The invention relates to a graphene-enhanced carbon-coated titanomanganese sodium phosphate microsphere electrode material and a preparation method thereof. The material can be used as a positive electrode active material of a sodium ion battery, and its chemical formula is Na 3 MnTi(PO 4 ) 3 / C@rGO, the microsphere diameter is 0.2-5μm, and the carbon content is 5%-10%. Beneficial effects of the present invention: it has unique advantages as a sodium ion positive electrode material, which not only further overcomes the shortcomings of poor conductivity and rapid capacity decay of the positive electrode material of polyanion sodium ion batteries, but also improves the rate performance of the material, making the material have a larger capacity. At the same time, it exhibits high reversible capacity, good cycle stability and high rate performance, and the preparation process is simple, the yield is high, it is suitable for industrial mass production, it is conducive to market promotion, and it has a wide range of applications in the field of sodium ion batteries prospect.

Description

technical field [0001] The invention belongs to the field of nanomaterials and electrochemistry, and in particular relates to a graphene-enhanced carbon-coated titanium manganese sodium phosphate microsphere electrode material and a preparation method thereof. The material can be used as a positive electrode active material of a sodium ion battery. Background technique [0002] With the rapid development of the global economy and the continuous improvement of energy demand, people have higher and higher standards for the energy storage density of ion batteries. Currently, the most common commercial energy storage systems studied are primary batteries, capacitors, secondary batteries, and supercapacitors. Among these storage systems, lithium (Li)-ion batteries have been widely used as a high-efficiency electrochemical energy storage device in electric vehicles and mobile communications. Although lithium-ion batteries have occupied a dominant position in the portable electroni...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054
CPCH01M4/366H01M4/5825H01M4/625H01M10/054H01M2004/021H01M2004/028Y02E60/10
Inventor 麦立强朱婷胡平周亮
Owner WUHAN UNIV OF TECH
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