Preparation method of lithium iron phosphate cathode material for lithium ion battery
A lithium-ion battery and lithium iron phosphate technology, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve the problem of low mixing uniformity, achieve excellent electrical conductivity, good safety performance, and low production costs.
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Embodiment 1
[0029] Lithium hydroxide: ferrous oxalate: ammonium dihydrogen phosphate = 1.2: 1: 1 was mixed in a molar ratio, and 3% conductive carbon black was added by weight, placed in a stirring ball mill for mixing and grinding for 10 min; the grinding product was added to In the twin-screw extruder, the control extrusion conditions are: temperature 25°C, screw speed 500r / min, figure 1 It is the XRD pattern of extruded product A. It can be seen from the figure that a chemical reaction has occurred between the raw materials during the reactive extrusion process, thus generating an amorphous substance; the extruded product is loaded into a porcelain boat and placed in an electric furnace. Under the protection of 1 liter / min of nitrogen, the temperature was raised to 400°C at a rate of 10°C / min, and kept for 5 hours; then the temperature was raised to 700°C at a rate of 10°C / min, and kept for 12 hours; then cooled to room temperature with the furnace, The resulting product is Product B. ...
Embodiment 2
[0032] Lithium carbonate: ferrous oxalate: phosphorus pentoxide = 0.5: 1: 0.5 molar ratio was mixed, and 5% sucrose was added by weight, placed in a stirring ball mill and mixed and ground for 30 minutes; the ground product was added to a twin-screw extruder In the machine, the extrusion conditions are controlled as follows: temperature 120°C, screw speed 400r / min; take out the ground product, put it into a porcelain boat, place it in an electric furnace, and under the protection of argon gas with a flow rate of 5 liters / min, at 15 The temperature was raised to 800°C at a rate of °C / min, kept at this temperature for 5 hours, and then cooled to room temperature with the furnace, and the product obtained was product C.
[0033] Assemble the battery according to the method of Example 1, test under room temperature, 0.5C current density, the result shows that its initial discharge specific capacity is 147.4mAh / g, and the specific capacity after 10 cycles is 145.8mAh / g; Its first ch...
Embodiment 3
[0035] Lithium hydroxide: niobium pentoxide: ferric hydrogen phosphate = 0.9: 0.05: 1 was mixed in a molar ratio, and 1% phenolic resin was added by weight ratio, and placed in a stirring ball mill for mixing and grinding for 60 min; the grinding product was added to three In the screw extruder, the extrusion conditions are controlled as follows: temperature 250°C, screw speed 50r / min; put the extruded product into a ceramic boat, and under the protection of nitrogen with a flow rate of 10 liters / min, at a speed of 15°C / min Raise the temperature to 600°C, keep it warm for 20 hours, then cool down to room temperature at a cooling rate of 5°C / min, and the resulting product is product D.
[0036] The battery was assembled according to the method of Example 1, and tested at room temperature and a current density of 1C. The results showed that the first discharge specific capacity was 143.6mAh / g, and the specific capacity after 20 cycles was 142.8mAh / g.
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