A layered large particle size high nickel single crystal ternary positive electrode material and preparation method thereof
A positive electrode material and large particle size technology, applied in the field of layered large particle size high nickel single crystal ternary positive electrode material and its preparation, can solve the problems of cation mixing, reducing battery capacity, etc., to improve the degree of single crystallization, The effect of reducing side reactions, improving capacity and cycle performance
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[0016] A first aspect of the present invention provides a method for preparing a layered large particle size high nickel single crystal ternary positive electrode material, comprising the following steps:
[0017] S1, take by weighing nickel salt, cobalt salt, manganese salt, strontium salt and disperse into pure water, obtain precursor solution;
[0018] S2, heating and decomposing the above-mentioned precursor solution after atomization to obtain a precursor powder;
[0019] S3, heat-treating the above-mentioned precursor powder, and then fully mixing the heat-treated precursor powder, the first lithium source, and the zirconia, and sequentially heating and melting, and one-time sintering to obtain a single-crystal ternary material;
[0020] S4. The single crystal ternary material is subjected to airflow pulverization, water washing, filtration, and drying, and then a second lithium source is added, and the mixture is continued to be evenly mixed. After secondary sintering, ...
Embodiment 1
[0040] (1) According to the molar ratio of n(Ni):n(Co):n(Mn)=83:12:5, NiCl 2 ·6H 2 O, CoCl 2 ·6H 2 O and MnCl 2 ·4H 2 O is dissolved in deionized water, the total salt concentration is 0.5mol / L, and strontium chloride powder accounting for 0.1% of the total salt mass is added, and the precursor solution is obtained after fully dissolving;
[0041] (2) The precursor solution was atomized at a frequency of 1.75 MHz using an ultrasonic atomizer, the droplet stream was transported in a tube furnace at a constant flow rate of 3 L / min by oxygen, and the furnace temperature was maintained at 800 °C, and nickel was used. The foam disc captures the prepared precursor powder;
[0042] (3) Heat treatment of the precursor powder in a tube furnace at a temperature of 400 °C for 3 h, and heat-treated precursor powder with LiOH·H 2 O (lithium / transition metal molar ratio of 1.02), ZrO 0.2% by mass of total salt 2Mix uniformly, and then heat the obtained mixture in a tube furnace in an...
Embodiment 2
[0045] (1) According to the molar ratio of n(Ni):n(Co):n(Mn)=83:12:5, NiCl 2 ·6H 2 O, CoCl 2 ·6H 2 O and MnCl 2 ·4H 2 O is dissolved in deionized water, the total salt concentration is 0.5mol / L, and strontium chloride powder accounting for 0.1% of the total salt mass is added, and the precursor solution is obtained after fully dissolving;
[0046] (2) The precursor solution was atomized at a frequency of 1.75 MHz using an ultrasonic atomizer, the droplet stream was transported in a tube furnace at a constant flow rate of 3 L / min by oxygen, and the furnace temperature was maintained at 800 °C, and nickel was used. The foam disc captures the prepared precursor powder;
[0047] (3) Heat treatment of the precursor powder in a tube furnace at a temperature of 350° C. for 4 h, and heat-treated precursor powder with LiOH·H 2 O (lithium / transition metal molar ratio of 1.02), ZrO 0.05% of total salt mass 2 Mix uniformly, and then heat the obtained mixture in a tube furnace in an...
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