Y/La-doped Co/B co-coated nickel-cobalt-manganese ternary positive electrode material and preparation method thereof
A cathode material, nickel-cobalt-manganese technology, which is applied in the field of Y/La doped Co/B co-coated nickel-cobalt-manganese ternary cathode material and preparation field, can solve the cycle performance and rate performance of nickel-manganese-manganese ternary cathode material To achieve the effect of stabilizing the crystal structure, improving the cycle performance and electrochemical performance, improving the cycle life and safety performance
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[0022] The preparation method of the Y / La doped Co / B co-coated nickel-cobalt-manganese ternary positive electrode material provided by the present invention comprises the following steps:
[0023] Step S1, weighing the nickel-cobalt-manganese precursor.
[0024] The types of nickel-cobalt-manganese precursors are not limited here, such as NCM811, NCM523, NCM622 and the like.
[0025] Step S2, according to the metal content of nickel, cobalt and manganese in the nickel-cobalt-manganese precursor, weigh a certain amount of compound containing Y and La and a certain amount of lithium source compound according to the expected ratio.
[0026] Step S3, adding the Y- and La-containing compound together with the nickel-cobalt-manganese precursor and the lithium source compound into a high-speed mixer for thorough mixing, and then calcining to obtain a doped matrix material.
[0027] In this step, the nickel-cobalt-manganese precursor is mixed with Y and La compounds and a lithium sou...
Embodiment 1
[0037] (1.1) Weigh 100g Ni 0.83 co 0.11 mn 0.06 (OH) 2 Precursor, 0.1% doped Y 2 o 3 (0.127g) and La 2 o 3 (0.117g) was added after mixing evenly, lithium hydroxide and precursor powder were added to the high-speed mixer according to Li / (Ni+Co+Mn)=1.01:1.1 and mixed. Sintering at low temperature of 500°C for 240min in oxygen atmosphere, sintering at high temperature of 800°C for 720min, cooling to 600°C for 120min, natural cooling to 100°C to obtain a Y / La doped matrix material for primary sintering.
[0038] (1.2) Add 100g of primary sintered Y / La doped matrix material into 50g of deionized water at 40°C and stir for 10min, drop in 1mol / L cobalt sulfate, stir for 10min, filter and wash, and dry in a rotary evaporator for 60min , after drying in a vacuum oven at 120°C for 480 minutes, the positive electrode material powder coated with cobalt hydroxide was obtained, and then sintered at 700°C for 10 hours in an oxygen atmosphere, and then naturally cooled to 100°C to obt...
Embodiment 2
[0050] (2.1) Weigh 100g Ni 0.80 co 0.10 mn 0.10 (OH) 2 Precursor, 0.1% doped Y 2 o 3 (0.127g) and La 2 o 3 (0.117g) was added after mixing evenly, lithium carbonate and precursor powder were added to the high-mixing equipment according to Li / (Ni+Co+Mn)=1.01:1.1 and mixed. Sintering at low temperature of 500°C for 240min in oxygen atmosphere, sintering at high temperature of 800°C for 720min, cooling to 600°C for 120min, natural cooling to 100°C to obtain a Y / La doped matrix material for primary sintering.
[0051] (2.2) Add 100g of primary sintered Y / La doped matrix material into 50g of deionized water at 40°C and stir for 10min, drop in 1mol / L cobalt oxalate, stir for 10min, filter and wash, and dry in a rotary evaporator for 60min , After drying in a vacuum oven at 120°C for 480min, a positive electrode material powder coated with cobalt hydroxide was obtained, which was sintered for a second time at 700°C for 10 hours in an oxygen atmosphere, and the temperature was ...
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