Method for preparing carbon-coated lithium iron phosphate by one-step hydrothermal method
A technology of carbon-coated lithium iron phosphate and hydrothermal method, which is applied in the direction of active material electrodes, electrical components, electrochemical generators, etc., can solve the problems of affecting the electrical properties of materials, reducing production efficiency, increasing process flow, etc., to achieve Effects of suppressing particle size and agglomeration, saving time and cost, and reducing particle size
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Embodiment 1
[0035] (1) First weigh 3.0 moles of LiOH and dissolve it in deionized water to form a 1.2 mol / L solution. After heating to 60°C, add 100 g of soluble starch and stir until it is completely gelatinized;
[0036] (2) Add the phosphoric acid of molar ratio Li:P=3.0:1.0 in the mixed slurry gained in step 1 again, i.e. 1 mole of phosphoric acid, keep warm at 80 ℃, keep stirring, obtain Li 3 PO 4 Suspension: due to the gelatinization of soluble starch added to the hot LiOH solution, the starch molecules in the granules stretch and diffuse in all directions, dissolve out of the granule, and expand Starch molecules are interconnected and entangled to form a network of hydrocolloids. When the starch enters the granule disintegration stage of the gelatinization reaction, the viscosity of the solution is the largest, which enables the starch molecules to wrap around LiOH, inhibits the reaction rate of LiOH and phosphoric acid, and inhibits the formation of Li 3 PO 4 The particle size ...
Embodiment 2
[0041] (1) First weigh 3.3 moles of LiOH and dissolve it in ionized water to form a 1.5 mol / L solution, add 120 g of water-soluble starch at room temperature, and stir until completely dissolved to form a mixed solution;
[0042] (2) Add the phosphoric acid of molar ratio Li:P=3.3:1.0 in the mixed liquor of gained in step 1 again, i.e. 1 mole of phosphoric acid, continuous stirring has generated Li 3 PO 4 Suspension; Li 3 PO 4 Add the suspension into the reaction kettle, seal the reaction kettle, use high-purity argon to purge the reaction kettle through the inlet valve, and discharge the internal air;
[0043] (3) take again the ferrous sulfate of Fe:P=1.0:1.0, i.e. 1 mole of ferrous sulfate, add in the deionized water of 0.5L, stir and dissolve, feed to Li through feed valve 3 PO 4 FeSO was added to the suspension 4 solution. The ratio of the added substances is the molar ratio Li: Fe: P = 3.1: 1.0: 1.0, the temperature of the reactor is raised to 240°C, and the temper...
Embodiment 3
[0046] (1) First weigh 3.1 moles of LiOH and dissolve it in deionized water to form a 1.0 mol / L solution, add 100 g of pregelatinized starch at 40°C, and stir until completely dissolved to form a starch paste;
[0047] (2) Add phosphoric acid with a molar ratio of Li:P=3.1:1.0 to the mixed solution obtained in step 1, that is, 1 mole of phosphoric acid, and stir at 40°C to form Li 3 PO 4 Suspension; Li 3 PO 4 The suspension is mixed with ultrasound at a frequency of 200Hz. The ultrasound makes the air bubbles in the mixture vibrate under the action of sound waves. When it reaches a certain limit, it will grow and collapse to play a role of cavitation. Using the effect of ultrasonic cavitation, Li 3 PO 4 Mix evenly with starch molecules in solution and control Li 3 PO 4 Particle size, uniform distribution. The Li after ultrasonic mixing 3 PO 4 Add the suspension into the reaction kettle, seal the reaction kettle, use high-purity argon to purge the reaction kettle throug...
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