Preparation method of lithium iron phosphate cathode material
A lithium iron phosphate, cathode material technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of uncontrollable distribution, reduce the specific capacity of the electrode and the tap density of the material, and improve the capacity and cycle. performance, improved electrical conductivity, and the effect of simple preparation process
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[0020] A method for preparing a lithium iron phosphate positive electrode material, comprising the following steps:
[0021] Step 1. Weigh lithium carbonate, ammonium dihydrogen phosphate and ferrous oxalate respectively according to the stoichiometric ratio of 1:1:1, add absolute ethanol (absolute ethanol and lithium carbonate, ammonium dihydrogen phosphate, ferrous oxalate raw materials) The volume ratio is 1.5:1~2.2:1) after mixing evenly, ball milling at 350~450rpm for 6~10h, and then vacuum drying at 60~100℃ for 10~20h to obtain the lithium iron phosphate precursor powder;
[0022] Step 2. The lithium iron phosphate precursor prepared in step 1 is kept at 350-450 °C for 4-6 hours in a tube furnace protected by a pure nitrogen atmosphere, and then heated to 600-800 °C for 6-10 hours, and then naturally cooled to 600-800 °C. Obtain the lithium iron phosphate cathode material at room temperature;
[0023] Step 3. Weigh 1wt.%~3wt.% of the copper flakes of the lithium iron ph...
Example Embodiment
[0024] Example 1:
[0025] Step 1. Weigh 0.05mol of lithium carbonate, ammonium dihydrogen phosphate, and ferrous oxalate, respectively, add 30 mL of absolute ethanol, mix well, and then ball-mill at 400 rpm / min for 6 h. After ball milling, dry in a vacuum drying oven at 80°C for 12 h to obtain lithium iron phosphate. precursor powder;
[0026] Step 2. Place the lithium iron phosphate precursor powder in a tube furnace protected by a pure nitrogen atmosphere, heat up to 350°C at a heating rate of 5°C / min, hold for 4 hours, and then heat up to 650°C at 5°C / min, It is kept for 10 hours, and then naturally cooled to room temperature to obtain a lithium iron phosphate positive electrode material.
[0027] Step 3. Weigh 0.11 g of copper flakes and 1.1 g of sucrose and add them to the prepared lithium iron phosphate positive electrode material, and ball mill for 1 hour to mix the materials evenly; then wash with absolute ethanol three times and centrifuge, and dry at 50°C for 10 ho...
Example Embodiment
[0029] Example 2:
[0030] Step 1. Weigh 0.05mol of lithium carbonate, ammonium dihydrogen phosphate, and ferrous oxalate, respectively, add 30 mL of absolute ethanol and mix them evenly, then ball-mill at 400 rpm / min for 8 hours, and dry in a vacuum drying oven at 80°C for 12 hours after ball milling to obtain lithium iron phosphate precursor powder;
[0031] Step 2. Place the lithium iron phosphate precursor powder in a tube furnace protected by a pure nitrogen atmosphere, heat up to 350°C at a heating rate of 5°C / min, hold for 4 hours, and then heat up to 650°C at 5°C / min, It is kept for 10 hours, and then naturally cooled to room temperature to obtain a lithium iron phosphate positive electrode material.
[0032] Step 3. Weigh 0.22 g of copper flakes and 1.1 g of sucrose into the prepared lithium iron phosphate positive electrode material, and ball mill for 2 hours to mix the materials evenly; then wash with absolute ethanol 3 times and centrifuge, and dry at 50°C for 10 ...
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