Preparing method of lithium cobalt phosphate cathode material
A cathode material, lithium cobalt phosphate technology, applied in the field of lithium ion batteries, can solve the problems of electrolyte decomposition, poor cycle performance, low electronic conductivity, etc., to improve specific surface area and conductivity, reduce particle size, easy to operate. Effect
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Embodiment 1
[0020] First weigh 0.012 mol of lithium carbonate, cobalt acetate and ammonium phosphate according to the molar ratio Li:Co:P=1:1:1, add 10mL of ethanol to the ball milling tank, mix it with ball milling, dry it in vacuum, and then place it in a muffle furnace Ignition at 350°C for 5h under an inert atmosphere of medium nitrogen to obtain mixture I;
[0021] Then the above mixture I is mixed with carbon black accounting for 5wt% carbon content of the mass of the active material and mixed with 10 mL of ethanol ball milled in a ball mill jar and then dissolved in 100 mL of ethanol solvent together with graphene sheets accounting for 0.5 wt % of the mass of the active material. After ultrasonic treatment for 5 hours, the solvent was removed by heating in a water bath at 80°C to obtain mixture II;
[0022] Next, the above mixture II was put into a muffle furnace at 650° C., and burned for 8 hours in a mixed reducing atmosphere of hydrogen and argon to obtain the lithium cobalt pho...
Embodiment 2
[0024] First weigh 0.012mol of lithium oxalate, cobalt nitrate and ammonium dihydrogen phosphate respectively according to the molar ratio Li:Co:P=1:1:1, add 10mL of ethanol to the ball mill, mix them with ball mill, dry them in vacuum, and then place them in a muffler Burning at 400°C for 5 hours in an inert atmosphere in a furnace to obtain mixture I;
[0025] Then mix the above mixture I with graphite with a carbon content of 5wt% of the mass of the active material and add 10mL of ethanol to the ball mill and mix it with the graphene sheet accounting for 1wt% of the mass of the active material. After 5 hours of treatment, heat in a water bath at 80°C to remove the solvent to obtain mixture II;
[0026] Next, the above mixture II was put into a muffle furnace at 750° C., and burned for 8 hours in a mixed reducing atmosphere of hydrogen and argon to obtain the lithium cobalt phosphate positive electrode material.
Embodiment 3
[0028] First weigh 0.012mol lithium acetate, cobalt oxide and ammonium phosphate respectively according to the molar ratio Li:Co:P=1:1:1, add 10mL ethanol ball mill to the ball mill jar, dry it in vacuum, then place it in the muffle furnace Ignition at 450°C for 5h under an inert atmosphere to obtain mixture I;
[0029] Then the above mixture I was mixed with sucrose with a carbon content of 5wt% of the mass of the active material and added to a ball mill jar to mix with 10mL of ethanol for ball milling, and then dissolved in 100mL of solvent ethanol solvent together with graphene sheets accounting for 2wt% of the mass of the active material, and ultrasonically After 5 hours of treatment, heat in a water bath at 80°C to remove the solvent to obtain mixture II;
[0030] Next, the mixture II was put into a muffle furnace at 650° C., and burned for 8 hours in a mixed reducing atmosphere to obtain the lithium cobalt phosphate positive electrode material.
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