Preparation method of 523 type positive electrode material
A positive electrode material and ball milling technology, applied in chemical instruments and methods, battery electrodes, inorganic chemistry, etc., can solve the problem that the advantages of ternary materials have not been fully utilized, and the discharge specific capacity and cycle performance of 523 positive electrode materials are not very ideal. problems, to achieve the effect of improving cycle performance, good overall performance, and improving discharge specific capacity
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[0031] Such as figure 1 As shown, a 523-type Li(Ni 0.5 co 0.2 mn 0.3 )O 2 A method for preparing a positive electrode material, comprising the steps of:
[0032] S1, take a certain amount of lithium carbonate, 523-type precursor and zirconia ball milling beads, and add them to the ball milling tank in sequence, and manually stir and mix evenly after adding;
[0033] S2, put the ingredients completed in step S1 into the ball mill, set the parameters of the ball mill to carry out ball milling, take out the ball milling tank after the ball mill stops running, and carry out sieving work, after the sieving is completed, bag it and put it into a drying box;
[0034] S3, taking an appropriate amount of the sample obtained in step S2 and putting it into an alumina crucible, and then putting the crucible into a ventilated muffle furnace to perform a sintering procedure;
[0035] S4, sieving the samples after completing the sintering procedure in step S3.
[0036] Specifically, in...
Embodiment 1
[0042] First get lithium carbonate, 523 precursors and zirconia ball milling beads, according to the metal molar ratio in 523 precursors and lithium carbonate is 1:1.07, the mass ratio of the mixture of zirconia ball milling beads and lithium carbonate and 523 precursors is 1 : 1, and put them into the ball mill pot in order, manually stir for 2 minutes until the mixture is uniform, and put it into the alumina crucible for sintering procedure after mixing evenly. , heat preservation and sintering in a crucible at 500°C for 360 minutes, heat preservation and sintering in a crucible at 500°C to 910°C for 205 minutes, heat preservation and sintering in a crucible at 910°C for 720 minutes, and sintering in a crucible at 910°C to 500°C for 205 minutes; after sintering Sieve through a 300-mesh sieve, and finally carry out SEM characterization and deduction test. After 300 cycles of deduction test, the capacity retention rate is 90%.
Embodiment 2
[0044]First get an appropriate amount of lithium carbonate, 523 precursors and zirconia ball milling beads, according to the metal molar ratio of 523 precursors and lithium carbonate is 1:1.05, the mass ratio of the mixture of zirconia ball milling beads and lithium carbonate and 523 precursors The ratio is 0.5:1, and they are added to the ball mill tanks in order, and artificially stirred for 2 minutes until the mixture is uniform. After the mixture is uniform, it is put into an alumina crucible for sintering. 120min, heat preservation and sintering in a crucible at 500°C for 240min, sintering in a crucible at 500°C to 870°C for 185min, heat preservation and sintering in a crucible at 870°C for 720min, and sintering in a crucible at 870°C to 500°C for 185min; after sintering Finally, the 400-mesh sieve was screened, and finally the SEM characterization and buckling test were carried out. After 500 cycles of the buckling test, the capacity retention rate was 80%.
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