A kind of lithium battery electrode material and preparation method thereof
An electrode material, lithium battery technology, applied in battery electrodes, electrode manufacturing, batteries, etc., can solve the problems of poor low temperature performance, low energy density, poor high-power charge and discharge performance, etc., to improve the charge and discharge rate, charge and discharge The effect of increased capacity
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[0014] The steps of the preparation method of lithium battery electrode material are as follows:
[0015] 1) Mix iron phosphate, copper acetate, and lithium organic acid according to the stoichiometric ratio given by the molecular formula, add diammonium hydrogen phosphate with half the mole of copper acetate, add water 3 to 5 times the weight of iron phosphate, and ball mill 1 to 3 hours to make a uniform slurry.
[0016] Iron phosphate is available as a commercial reagent or can be synthesized by the following reaction:
[0017] Fe 2 (SO 4 ) 3 +2Na 3 PO 4 = 2FePO 4 +3Na 2 SO 4 (1)
[0018] Because commercial ferric phosphate has undergone drying and dehydration after preparation, the surface activity is significantly reduced. The present invention proposes to synthesize ferric phosphate by formula (1); and it is recommended that the synthesized product be used directly after centrifugation or press filtration dehydration without drying Dry to ensure the surface ac...
Embodiment 1
[0035] 1) Weigh 4.7kg of lithium acetate, 2.9kg of copper acetate, 1.9kg of diammonium hydrogen phosphate, add 65L of water, stir evenly until the solid phase is completely dissolved; then add 10kg of iron phosphate, stir to form a uniform suspension, pour it into a ball mill, Ball milling for 3 hours;
[0036] 2) Spray-dry the slurry obtained by ball milling at 150°C to obtain dry powder with uniform particle size;
[0037] 3) Press the powder into a cylindrical shape with a compression die, put it into a closed calciner, and calcinate it at 550°C for 6 hours in a vacuum environment, and cool it to room temperature to obtain cuprous ion-doped lithium iron phosphate.
Embodiment 2
[0039] 1) Take 1,000 liters of ferric sulfate solution containing 8 g / L of iron, pour 10% trisodium phosphate solution into it, stir until the pH reaches 1.7, collect the precipitate, filter it for dehydration, rinse it with cold water for several times, and Press filtration again to obtain ferric phosphate;
[0040] 2) Mix iron phosphate + lithium formate + copper acetate + diammonium hydrogen phosphate in a molar ratio of 1:1.1:0.2:0.1, add 3 times the mass of water to form a uniform suspension, pour it into a ball mill, and ball mill for 1 hour ;
[0041] 3) Spray drying at 200°C to obtain dry powder with uniform particle size. Put the obtained powder into a closed container for compaction, heat to 700° C. in an argon atmosphere, calcinate for 2 hours, and cool to room temperature to obtain cuprous ion-doped lithium iron phosphate.
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