High-volume and capacity ratio spherical lithium ferric phosphate and preparation method thereof
A technology of lithium iron phosphate and specific capacity, which is applied in the field of lithium-ion battery cathode materials and its preparation, can solve the problems of low tap density, high process requirements for spherical lithium iron phosphate, and poor high-rate charge-discharge performance, etc., to achieve prevent rapid growth
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Embodiment 1
[0024] 0.21 g of LiOH·H 2 O was added to the prepared 0.5mol / L HNO 3 Dissolve in the solution, then add 1.11 g of FePO 4 4H 2 O and 0.44 g vitamin C, stir the solution and mix well. use NH 3 The water was adjusted to just precipitate (pH = 7). Then the solution was put into a microwave oven, and the solvent was evaporated to dryness by alternately heating for 5 seconds and intermittently for 5 seconds to obtain a yellow powder. Grind the obtained yellow powder into fine particles, put it into a porcelain boat, put it into a high-temperature furnace, and raise the temperature to 700°C at a rate of 5°C / min in a high-purity nitrogen atmosphere, and keep it warm for 6 hours to obtain a spherical lithium iron phosphate sample. The tap density is 2g / cm 3 . XRD test shows pure lithium iron phosphate with olive structure. The topography of the sample and the first charge-discharge curve at 0.1C are shown in figure 1 and figure 2 middle. Such as figure 1 As shown, the obta...
Embodiment 2
[0026] Weigh out 0.52 g of CH 3 COOLi·2H 2 O was added to the prepared 0.5mol / L HNO 3 Dissolve in the solution, then add 1.11 g of FePO 4 4H 2 O and 0.44 g vitamin C, stir the solution and mix well. use NH 3 The water was adjusted to just precipitate (pH = 7). Then the solution was put into a microwave oven, and the solvent was evaporated to dryness by alternately heating for 5 seconds and intermittently for 30 seconds to obtain a yellow powder. Grind the obtained yellow powder into fine particles, put it into a porcelain boat, put it into a high-temperature furnace, and raise the temperature to 700°C at a rate of 5°C / min in a high-purity nitrogen atmosphere, and keep it warm for 6 hours to obtain a spherical lithium iron phosphate sample. The tap density is 1.7g / cm 3 .
Embodiment 3
[0028] 0.19 g of Li 2 CO 3 Add prepared 0.5mol / L HNO 3 Dissolve in the solution, then add 1.11 g of FePO 4 4H2 O and 0.44 g vitamin C, stir the solution and mix well. use NH 3 The water was adjusted to just precipitate (pH = 7). Then the solution was put into a microwave oven, and the solvent was evaporated to dryness by alternately heating for 10 seconds and intermittently for 30 seconds to obtain a yellow powder. Grind the obtained yellow powder into fine particles, put it into a porcelain boat, put it into a high-temperature furnace, and raise the temperature to 700°C at a rate of 5°C / min in a high-purity nitrogen atmosphere, and keep it warm for 6 hours to obtain a spherical lithium iron phosphate sample. The tap density is 1.7g / cm 3 .
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