Preparation method of high-compaction lithium iron phosphate
A real lithium iron phosphate, high-voltage technology, applied in chemical instruments and methods, phosphorus compounds, nanotechnology for materials and surface science, etc., can solve the problem that lithium iron phosphate cannot improve both the electronic conductivity and ion conductivity of lithium iron phosphate Improve the intrinsic conductivity, improve the gram capacity, and improve the compacted density and conductivity
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Embodiment 1
[0033] (1) According to a total of 1.5 g of LiFe 0.95 Ca 0.05 PO 4 The stoichiometric ratios of lithium acetate, phosphoric acid, ferric chloride and calcium chloride are weighed respectively;
[0034] (2) Lithium acetate is added to the absolute ethanol containing 5% (wt) polyethylene glycol, and is continuously stirred until a clear clear liquid is formed;
[0035] (3) Add ammonium dihydrogen phosphate, iron oxalate and calcium chloride to the above clear liquid, stir well for 5 hours to obtain a sol, transfer the sol to a watch glass, dry at 80°C for 15 hours to obtain a gel, and grind the gel into powder;
[0036] (4) calcining the powder in a reducing atmosphere, calcining at 500 ℃ for 2 hours, and then calcining at 800 ℃ for 8 hours;
[0037] (5) Naturally cooled to room temperature, and ground to obtain powdery lithium iron phosphate.
[0038] The morphology of the calcined lithium iron phosphate powder in Example 1 was observed by SEM, as shown in figure 1 , fi...
Embodiment 2
[0040] (1) According to a total of 1.5 g of LiFe 0.97 Zn 0.03 PO 4 The stoichiometric ratios of lithium hydroxide, phosphoric acid, ferric chloride and zinc nitrate are weighed respectively;
[0041] (2) Lithium hydroxide is added to the absolute ethanol containing 2% (wt) cetyl trimethyl ammonium bromide, stirring constantly, until transparent clear liquid is formed;
[0042] (3) adding phosphoric acid, ferric chloride and zinc nitrate to the above clear liquid, fully stirring for 4h to obtain a sol, transferring the sol to a watch glass, drying at 85°C for 13h to obtain a gel, and grinding into powder;
[0043](4) calcining the powder in a reducing atmosphere, calcining at 400°C for 3h, and then calcining at 600°C for 10h;
[0044] (5) Naturally cooled to room temperature, and ground to obtain powdery lithium iron phosphate.
Embodiment 3
[0046] (1) According to a total of 1.5 g of LiFe 0.98 Zn 0.03 PO 4 The stoichiometric ratios of lithium hydroxide, phosphoric acid, ferric chloride and zinc nitrate are weighed respectively;
[0047] (2) Lithium hydroxide is added to the absolute ethanol containing 2% (wt) cetyl trimethyl ammonium bromide, stirring constantly, until transparent clear liquid is formed;
[0048] (3) adding phosphoric acid, ferric chloride and zinc nitrate to the above clear liquid, fully stirring for 4h to obtain a sol, transferring the sol to a watch glass, drying at 85°C for 13h to obtain a gel, and grinding into powder;
[0049] (4) calcining the powder in a reducing atmosphere, calcining at 350°C for 3h, and then calcining at 750°C for 10h;
[0050] (5) Naturally cooled to room temperature, and ground to obtain powdery lithium iron phosphate.
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