Method for preparing carbon coated nanometer LiFePO4
A technology of lithium ferrous phosphate and nano-iron phosphate, which is applied in the direction of electrical components, battery electrodes, circuits, etc., can solve the problems that affect the large-scale production and application of lithium iron phosphate materials, poor electrical conductivity of lithium iron phosphate cathode materials, To solve the problems of the purity and uneven particle size of the positive electrode material, and achieve the effects of easy implementation, improved ion mobility and conductivity, and wide particle size distribution
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Embodiment 1
[0027] 1) Take nano-iron phosphate, nano-lithium carbonate and stearic acid according to the ratio of molar ratio Fe:Li:C=1:1:2.5, wherein iron phosphate is 0.005mol. Dissolving stearic acid in ethanol, and then adding nano-iron phosphate and nano-lithium carbonate thereto. The resulting suspension was sonicated for 15 min to obtain a stable and uniform nanofluid. The nanofluid was dried in a constant temperature oven at 80° C. for 30 minutes, and the solvent was removed to obtain a solid particle reaction mixture.
[0028] 2) The obtained solid particle reaction mixture was placed in a tubular reactor, pre-calcined at 300° C. for 1 h in an inert gas Ar atmosphere atmosphere, and calcined at 700° C. for 6 h, wherein the heating rate was 5 K / min. Lithium iron phosphate particles were obtained after natural cooling, which was designated as sample A.
[0029] figure 1 The SEM image of the nano-iron phosphate and the TEM image of the nano-lithium carbonate used in Example 1 sho...
Embodiment 2
[0031] 1) Take nano-iron phosphate, nano-lithium carbonate and vitamin C according to the ratio of molar ratio Fe:Li:C=1:1:5, wherein iron phosphate is 0.005mol. The vitamin C is dissolved in an aqueous solution of acetone containing 50% of acetone, and then nano iron phosphate and nano lithium carbonate are added thereto. The resulting suspension was sonicated for 15 min to obtain a stable and uniform nanofluid. Send the nanofluid into a vacuum desiccator to remove the solvent to obtain a solid particle reaction mixture.
[0032] 2) The obtained solid particle reaction mixture was placed in a tubular reactor, pre-calcined at 300° C. for 1 h in an inert gas Ar atmosphere atmosphere, and calcined at 700° C. for 6 h, wherein the heating rate was 5 K / min. Lithium iron phosphate particles were obtained after natural cooling.
Embodiment 3
[0034] 1) Take nano-iron phosphate, nano-lithium carbonate and oxalic acid according to the ratio of molar ratio Fe:Li:C=1:1:3, wherein iron phosphate is 0.005mol. Dissolving oxalic acid in isopropanol aqueous solution containing 30% isopropanol, and then adding nano iron phosphate and nano lithium carbonate thereto. The resulting suspension was mechanically ground for 15 min to obtain a stable and uniform nanofluid. The nanofluid is sent to a flash evaporator to remove the solvent to obtain a solid particle reaction mixture.
[0035] 2) The obtained solid particle reaction mixture is placed in a tubular reactor, pre-calcined at 300° C. for 1 h in a hydrogen atmosphere, and calcined at 700° C. for 6 h, wherein the heating rate is 10 K / min. Lithium iron phosphate particles were obtained after natural cooling.
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