Nanometer spherical lithium iron phosphate positive electrode material and preparation method thereof
A technology of lithium iron phosphate and positive electrode materials, applied in the direction of nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problems affecting the tap density and irregular product shape, and achieve the improvement of compaction density and particle densification High degree, effect of reducing unit cell volume
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Embodiment 1
[0042] A preparation method of a nano-spherical lithium iron phosphate positive electrode material, comprising the following steps:
[0043] Step (101): heating 100 mL of n-butanol in a water bath at 50° C., adding aluminum sec-butoxide and LiOH thereto, stirring and dissolving to obtain a first solution, wherein the concentration of LiOH in n-butanol is 0.002 mol / L, According to the molar ratio of lithium element and aluminum element, the molar ratio of LiOH to aluminum sec-butoxide is 1:0.01.
[0044] Step (102): adding 30 mL of acetonitrile to the first solution to obtain a second solution.
[0045] Step (103): FePO 4 As phosphorus source and iron source, they were added to 50 mL of n-butanol, and water was added, stirred and dissolved to obtain a third solution, wherein, according to the molar ratio of lithium element, phosphorus element, and iron element, LiOH, phosphorus source, iron source The molar ratio of the added amount is 1:0.95:0.95, and the mass of water is tw...
Embodiment 2
[0050] A preparation method of a nano-spherical lithium iron phosphate positive electrode material, comprising the following steps:
[0051] Step (201): 150 mL of methanol was heated in a water bath at 80°C, to which was added aluminum triethoxide and Li 2 CO 3 , stirring and dissolving to obtain the first solution, in which Li 2 CO 3 The concentration in methanol is 0.005mol / L. According to the molar ratio of lithium element and aluminum element, Li 2 CO 3 The molar ratio to aluminum triethoxide was 1:0.015.
[0052] Step (202): Add 75 mL of acetonitrile to the first solution to obtain a second solution.
[0053] Step (203): FePO 4 As phosphorus source and iron source, it was added to 15 mL of n-hexanol, and water was added, stirred and dissolved to obtain a third solution, wherein, according to the molar ratio of lithium element, phosphorus element and iron element, Li 2 CO 3 , phosphorus source, iron source molar ratio is 1:0.98:0.98, and the quality of water is 3 tim...
Embodiment 3
[0057] A preparation method of a nano-spherical lithium iron phosphate positive electrode material, comprising the following steps:
[0058] Step (301): 200 mL of cyclohexanol was heated in a water bath at 100°C, and tri-n-propoxide aluminum and LiH were added thereto 2 PO 4 , stirring and dissolving to obtain the first solution, in which LiH 2 PO 4 The concentration in cyclohexanol is 0.008mol / L. According to the molar ratio of lithium element and aluminum element, LiH 2 PO 4 The molar ratio to aluminum tri-n-propoxide was 1:0.02.
[0059] Step (302): Add 120 mL of acetonitrile to the first solution to obtain a second solution.
[0060] Step (303): FePO 4 As phosphorus source and iron source, it was added to 10 mL of n-hexanol, and water was added, stirred and dissolved to obtain a third solution, wherein, according to the molar ratio of lithium element, phosphorus element and iron element, LiH 2 PO 4 , phosphorus source, iron source molar ratio is 1:1:1, and the qual...
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