Flaky structure sodium vanadium phosphate composite positive electrode material and preparation method thereof
A composite positive electrode material, sodium vanadium phosphate technology, applied in structural parts, nanotechnology for materials and surface science, battery electrodes, etc., can solve problems such as hindering high specific capacity, low electronic conductivity, and affecting conductivity. Achieve the effects of controllable reaction conditions, large specific surface area, and accelerated infiltration
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Embodiment 1
[0034] Accurately weigh 4.68g of sodium dihydrogen phosphate, 1.82g of vanadium pentoxide and 1.37g of glucose into a ball mill jar, then add absolute ethanol and agate balls, and ball mill for 24 hours at a speed of 30r / min. After ball milling, the suspension was obtained, and then placed in a forced air drying oven at 80° C. for 12 hours. Finally, the precursor powder was placed in a tube furnace under Ar-H 2 In a mixed atmosphere of (95:5), pre-calcined at 350° C. for 4 hours and secondary calcined at 750° C. for 12 hours respectively, the sheet-like sodium vanadium phosphate composite positive electrode material of this example was obtained.
[0035] figure 1 Prepare the X-ray diffraction pattern of the product obtained in this embodiment, as can be seen from the figure, its crystallinity is better and all diffraction peaks can be indexed as sodium vanadium phosphate. figure 2 The field emission scanning electron micrograph of the product prepared for this example shows...
Embodiment 2
[0037] Accurately weigh 2.46g of sodium acetate, 1.5g of vanadium trioxide, 2.94g of phosphoric acid and 2.88g of sucrose in a ball mill jar, then add methanol and agate balls, and ball mill for 12 hours at a speed of 48r / min. After ball milling, the suspension was obtained, and then placed in a forced air drying oven at 80° C. for 12 hours. Finally, the precursor powder was placed in a tube furnace under Ar-H 2 In a mixed atmosphere of (95:5), pre-calcination at 350°C for 4h and secondary calcination at 750°C for 12h, the sheet-like structure sodium vanadium phosphate composite positive electrode material of this example was obtained, and its cycle and rate performance were compared with those of Example 1. near.
Embodiment 3
[0039] Accurately weigh 4.68g of sodium dihydrogen phosphate, 1.82g of vanadium pentoxide and 1.37g of maltose in a ball mill jar, then add acetone and agate balls, and ball mill for 18 hours at a speed of 30r / min. After ball milling, the suspension was obtained, and then placed in a forced air drying oven at 80° C. for 20 h. Finally, the precursor powder was placed in a tube furnace under Ar-H 2 In a mixed atmosphere of (95:5), pre-calcination at 350°C for 4 hours and secondary calcination at 750°C for 12 hours, the sheet-like structure sodium vanadium phosphate composite positive electrode material was obtained, and its cycle and rate performance were close to those of Example 1.
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