Hydrothermal synthesis method for preparing iron phosphate lithium as anode material of lithium ion battery
A lithium-ion battery, lithium iron phosphate technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of low bulk density, low volume specific capacity, low specific capacity, etc., and achieve easy control of process parameters and excellent battery performance. , the effect of uniform particle distribution
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[0014] Example 1:
[0015] 1. Configure iron source and phosphorus source aqueous solution, where the concentration of iron is 0.1-2 mol / liter, the concentration of phosphorus is phosphorus: iron = (1.0-1.5): 1, configure the lithium source solution, the concentration is lithium: iron = 3 :1.
[0016] 3. Mix the above iron source solution and phosphorus source solution, move them into the autoclave, and stir for 10 minutes.
[0017] 4. Slowly add the prepared lithium source solution to the mixed solution in the autoclave and stir.
[0018] 5. Add the reducing agent with a mass ratio of 15%-30% into the mixed solution, adjust the PH value between 5.0-8.0 with acetic acid, and stir for 1-2 hours.
[0019] 6. Seal the autoclave, heat it up to 180℃-200℃, keep it for 8-12h. Cool down naturally to room temperature.
[0020] 7. Wash the obtained product with distilled water for 5-10 times, disperse with ethanol, and place it in a drying oven at 70°C-90°C for drying.
[0021] In the above prepa...
Example Embodiment
[0025] Example 2:
[0026] Prepare 0.3M lithium hydroxide, 0.1M diammonium hydrogen phosphate, 0.1M ferrous oxalate aqueous solution, and weigh 10g sucrose. Transfer the solution of ferrous oxalate and ammonium dihydrogen phosphate into the autoclave and stir with a stirrer for 10 minutes. Put the lithium hydroxide solution into the autoclave, add sucrose, continue stirring for 1 hour, adjust the pH 5.0-8.0 with acetic acid, and seal the autoclave. Raise the temperature to 180°C and keep it for 8h. Then the reaction kettle is naturally cooled and set to room temperature, the obtained product is washed 5-10 times with distilled water, dispersed with ethanol, and dried in a drying box at 70°C. The obtained lithium iron phosphate product was tested by SEM and electrical performance test, and the SEM showed that the particle size was about 3 μm and the particle distribution was uniform. The measured tap density of the product is 2.0 g / cm3. Using the lithium sheet as the negative ...
Example Embodiment
[0027] Example 3:
[0028] Prepare 0.45M lithium hydroxide, 0.15M diammonium hydrogen phosphate, 0.15M ferrous oxalate aqueous solution, and weigh 20g sucrose. Transfer the ferrous oxalate and ammonium dihydrogen phosphate solution into the autoclave and stir with a stirrer for 10 minutes. Put the lithium hydroxide solution into the autoclave, add ascorbic acid, continue stirring for 1.5 hours, adjust the pH 5.0-8.0 with acetic acid, and seal the autoclave. Raise the temperature to 200°C and keep it for 8 hours. Then the reaction kettle was naturally cooled and set to room temperature, and the obtained product was washed 5-10 times with distilled water, dispersed with ethanol, and dried in a drying box at 80°C. The obtained lithium iron phosphate product was tested by SEM and electrical performance test, and the SEM showed that the particle size was about 4 μm and the particle distribution was uniform. The measured tap density of the product is 2.4 g / cm3. Using the lithium sh...
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