Preparation method of large single crystal lithium ion battery nickel cobalt lithium manganate cathode material
A nickel-cobalt lithium manganese oxide and lithium-ion battery technology, which is applied in the field of lithium-ion power batteries for new energy vehicles, can solve the problems of low initial efficiency, low discharge capacity, and low capacity, and achieve less surface defects, clear particles, and thicker uniform effect
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Embodiment 1
[0052] This embodiment provides a method for preparing a nickel cobalt lithium manganate positive electrode material for a large single crystal lithium ion battery, which includes the following steps:
[0053] First, set D50 to 3.7μm and BET to 4.3m 2 / g of small particle ternary precursor material Ni 0.60 Co 0.20 Mn 0.20 (OH) 2 , Lithium hydroxide powder and nano-zirconium fluoride are placed in a ball milling tank and mixed evenly by high-speed ball milling; among them, the molar ratio of lithium to precursor metal element is 1.06, and the mass fraction of zirconium element in the total material is 5000 ppmw;
[0054] Secondly, perform a sintering under the condition of high purity oxygen, the oxygen concentration is 85-99%, the sintering temperature is 940℃, the heating rate is 5℃ / min, the temperature is kept for 14h, and it is cooled to 60℃. Inlet pressure: 3MPa, jaw break, the gap between the rollers is 0.5mm, the airflow crushing frequency is 50Hz, the classification frequency...
Embodiment 2
[0058] This embodiment provides a method for preparing a nickel cobalt lithium manganate positive electrode material for a large single crystal lithium ion battery, which includes the following steps:
[0059] First, set D50 to 4.1μm and BET to 3.8m 2 / g of small particle ternary precursor material Ni 0.65 Co 0.15 Mn 0.20 (OH) 2 , Lithium hydroxide powder and nano-aluminum fluoride are placed in a ball mill tank and mixed evenly by high-speed ball milling; among them, the molar ratio of lithium to precursor metal element is 1.05, and the mass fraction of aluminum element in the total material is 3000 ppmw;
[0060] Secondly, perform a sintering under the condition of high purity oxygen. The oxygen concentration is 75-85%, the sintering temperature is 930℃, the heating rate is 8℃ / min, the temperature is kept for 14h, and it is cooled to 60℃. Inlet pressure: 2MPa, jaw crushing, the gap between the rollers is 0.3mm, the airflow crushing frequency is 30Hz, the classification frequency i...
Embodiment 3
[0064] This embodiment provides a method for preparing a nickel cobalt lithium manganate positive electrode material for a large single crystal lithium ion battery, which includes the following steps:
[0065] First, set D50 to 3.5μm and BET to 3.4m 2 / g of small particle ternary precursor material Ni 0.60 Co 0.10 Mn 0.30 (OH) 2 , Lithium hydroxide powder and nano-magnesium fluoride are placed in a ball milling tank and mixed uniformly by high-speed ball milling; among them, the molar ratio of lithium to precursor metal element is 1.04, and the mass fraction of magnesium element in the total material is 2000 ppmw;
[0066] Secondly, perform a sintering under high-purity oxygen conditions. The oxygen concentration is 65-75%, the temperature is 920℃, the temperature is kept for 14h, and the temperature is 920℃. The gap between the rollers is 0.2mm, the airflow crushing frequency is 25Hz, the classification frequency is 120Hz, and the sieving is carried out; finally, a sintered single ...
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