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
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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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