Electromagnetic field-constrained plasma enhanced oxidation calcination method of high-nickel positive electrode material of lithium ion battery
A lithium-ion battery and discharge plasma technology, which is applied to battery electrodes, secondary batteries, electrochemical generators, etc., can solve the problems of low utilization rate of active oxygen, high degree of cation mixing, and limited enhanced oxidation. Achieve the effects of improving working conditions, increasing oxidation capacity and oxidation speed, and reducing production costs
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[0076] Example 1
[0077] Weigh 0.1 mol precursor Ni 0.80 Co 0.15 Al 0.05 (OH) 2 Mix the precursor and lithium carbonate powder uniformly with 0.0525 mol of lithium carbonate, and place them in a quartz tube (placed in a quartz tube furnace). Air was introduced into the quartz tube furnace at a flow rate of 500 ml / min, and the reacted gas was discharged from the quartz tube furnace, and the gas pressure in the furnace was maintained at normal pressure. The AC power supply is used to adjust the voltage of the atmospheric pressure discharge plasma generator to 10kV, the frequency to 15kHZ, and the power to be 500 W, so that the air will generate plasma discharge in the tube to generate active oxygen. Adjust the electric field intensity produced by the deflection electric field generator to 5kV / m, and adjust the magnetic induction intensity produced by the magnet to 2T. The quartz tube furnace was raised to 800°C at a temperature rising rate of 200°C / h, kept for 12 hours, and then ...
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[0081] Example 2
[0082] Turn off the deflection electric field generator, and other conditions are the same as in Example 1, to synthesize high nickel cathode material nickel cobalt lithium aluminate. It was measured that the mixing degree of cations in the nickel-cobalt lithium aluminate cathode material was about 2.5%, the pH was 11.58, and the first coulombic efficiency (0.1C) of the button half-cell was 88.8%; the specific capacity of the button half-cell 0.1C was 201mAh / g; Aluminum shell full battery 1C gram specific capacity 165mAh / g, 300-cycle cycle capacity retention rate of 92.6%, 500-cycle cycle capacity retention rate of 89.5%.
[0083] The overall performance of the material is lower than that of Example 1, which indicates that there is only magnetic field confinement but no electric field confinement, and the confinement enrichment effect of plasma is weakened, which affects the enhanced oxidation roasting effect.
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[0084] Example 3
[0085] Turn off the electromagnet, and other conditions are the same as in Example 1, to synthesize high nickel cathode material nickel cobalt lithium aluminate. It was measured that the mixing degree of cations in the nickel cobalt lithium aluminate cathode material was about 2.4%, the pH was 11.60, the first coulombic efficiency (0.1C) of the button half-cell was 89.8%; the specific capacity of the button half-cell 0.1C was 201mAh / g; Aluminum shell full battery 1C gram specific capacity 166mAh / g, 300-cycle cycle capacity retention rate of 92.7%, 500-cycle cycle capacity retention rate of 90.5%.
[0086] The overall performance of the material is lower than that of Example 1, which indicates that there is only electric field confinement without magnetic field confinement, and the confinement enrichment effect of plasma will also be weakened, which affects the enhanced oxidation roasting effect.
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