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

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: 2018-12-07
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 sodium titanium manganese phosphate microsphere electrode material and preparation method and application thereof
  • Graphene-reinforced carbon-coated sodium titanium manganese phosphate microsphere electrode material and preparation method and application thereof
  • Graphene-reinforced carbon-coated sodium titanium manganese phosphate microsphere electrode material and preparation method and application thereof

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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 of citric acid powder, 5mmol of manganese acetate powder, 15mmol of sodium dihydrogen phosphate powder, and 5mmol of bis(2-hydroxypropionic acid)diammonium dihydroxide titanium into 100mL of deionized water in sequence, and 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%, 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@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 ...

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-reinforced carbon-coated sodium titanium manganese phosphate microsphere electrode material and a preparation method thereof, wherein the material can be used as apositive electrode active material of a sodium ion battery, the chemical formula is Na3MnTi (PO4) 3 / C @ rGO, and the diameter of the microsphere is 0.2-5. Mu. and the carbon content is 5%-10%. The invention has the advantages of: As a sodium ion cathode material, As that conductivity of the cathode material of the polyanion sodium ion battery is poor, Disadvantages of rapid capacity decay, At thesame time, the multiplier performance of the material is improved, so that the material possesses high reversible capacity, good cycle stability and high multiplier performance while possessing largecapacity, and the preparation process is simple, the yield is high, the material is suitable for industrialized mass production, is conducive to market promotion, and has wide application prospects inthe field of sodium ion batteries.

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 Applications(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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