Na3.64Fe2.18(P2O7)2 positive electrode material, and preparation method and application thereof
A technology of na3.64fe2.18 and 1.na3.64fe2.18, which is applied in the field of sodium iron pyrophosphate [Na3.64Fe2.182] positive electrode material and its preparation, can solve the problem of unsatisfactory cycle performance of sodium ion batteries, easy Destroying the crystal structure of metal oxides, low operating voltage of metal oxide materials, etc., to achieve excellent capacity, simple preparation method, and good cycle performance
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Embodiment 1
[0028] Example 1, Na 3.64 Fe 2.18 (P 2 o 7 ) 2 Synthesis of Cathode Materials
[0029] Weigh 1.7614g ferric nitrate nonahydrate and dissolve in 40ml deionized water to obtain liquid I; weigh 0.357g ascorbic acid and dissolve in liquid I to obtain liquid II; weigh 0.3858g sodium carbonate and 0.9202g ammonium dihydrogen phosphate to dissolve in liquid II solution, stir until the solution is clear to obtain liquid III; weigh 2.236g of citric acid and dissolve it in liquid III, stir in a water bath at 60-70°C until the solution is evaporated to dryness, and obtain a viscous sol; vacuum-dry the sol at 100-120°C for 12 hours , get Na 3.64 Fe 2.18 (P 2 o 7 ) 2 Precursor gel; the resulting gel was mixed in a hydrogen-argon atmosphere (10% H 2 Calcined at 500-600°C for 24h at +90% Ar) to obtain Na 3.64 Fe 2.18 (P2 o 7 ) 2 Cathode material. The resulting product looks like figure 1 As shown, the sample is uniform in appearance and carbon-coated evenly, showing a loose s...
Embodiment 2
[0030] Example 2, Na 3.64 Fe 2.18 (P 2 o 7 ) 2 Synthesis of Cathode Materials
[0031] Weigh 1.7614g ferric nitrate nonahydrate and dissolve in 40ml deionized water to obtain liquid I; weigh 0.357g ascorbic acid and dissolve in liquid I to obtain liquid II; weigh 0.3858g sodium carbonate and 0.9202g ammonium dihydrogen phosphate to dissolve in liquid II solution, stir until the solution is clear to obtain liquid III; weigh 4.472g citric acid and dissolve it in liquid III, stir in a water bath at 60-70°C until the solution is evaporated to dryness, and obtain a viscous sol; vacuum-dry the sol at 100-120°C for 12 hours , get Na 3.64 Fe 2.18 (P 2 o 7 ) 2 Precursor gel; the resulting gel was mixed in a hydrogen-argon atmosphere (10% H 2 Calcined at 500-600°C for 24h at +90% Ar) to obtain Na 3.64 Fe 2.18 (P 2 o 7 ) 2 Cathode material. The resulting product looks like image 3 indicated by image 3 It can be seen that the Na prepared by 2 times the chelating agent ...
Embodiment 3
[0032] Embodiment 3, the preparation of battery and electrochemical performance test
[0033] Get the Na that embodiment 1 makes 3.64 Fe 2.18 (P 2 o 7 ) 2 Mix with acetylene black and PVDF binder at a ratio of 8:2:1, take an appropriate amount of 1-methyl-2-pyrrolidone (NMP) as a solvent, and grind it in an agate mortar for 20 minutes to obtain a black sticky positive electrode slurry. Take the positive electrode slurry and apply it evenly on the aluminum foil, dry it in vacuum at 120°C for 12 hours, then cut the aluminum foil into a circle with a diameter of 19mm with a tablet machine to obtain the positive electrode sheet; transfer the prepared positive electrode sheet to a glove box for further processing. Assembling the button battery, the button battery model used is CR2032, the diaphragm model is Celgard 2400, and the electrolyte is 1mol / L NaClO 4 solution (the solvent is a mixture of ethylene carbonate and dimethyl carbonate in a volume ratio of 1:1), and the nega...
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