Preparation technique of lithium-ion battery anode material lithium iron phosphate
A lithium iron phosphate and lithium ion battery technology, applied in electrode manufacturing, battery electrodes, circuits, etc., can solve the problems of inconsistent technical indicators, few discharge times, and high costs, and achieve high technical indicators consistency, energy saving, Produce simple effects
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[0026] Raw materials: iron powder Fe, lithium hydroxide LiOH or lithium carbonate Li 2 CO 3 and phosphate H 3 PO 4 .
[0027] Production equipment: ordinary reaction kettle, rotary sintering kiln.
[0028] Production process: first add iron powder and 50% phosphoric acid in equimolar amount to the reaction kettle, heat up to 85-90°C, stir to make it completely react, and then add lithium hydroxide LiOH solution in equimolar amount to the kettle , or add 1 / 2 mole of lithium carbonate Li 2 CO 3 Solution, stir to make it fully reacted. Lithium ferrous phosphate LiFePO 4 Precursor suspension. Transfer the suspension of lithium iron phosphate precursor to the sintering kiln, then add carbon-coated materials, raise the temperature to 150°C to completely evaporate the water, and then raise the temperature to 700°C for 20 hours to sinter under the protection of non-oxidizing gas. Obtain lithium iron phosphate LiFePO with the required olivine structure 4 crystals.
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