High-voltage and high-rate type lithium cobalt oxide cathode material and preparation method thereof
A cathode material, lithium cobalt oxide technology, applied in the field of high-voltage high-rate lithium cobalt oxide cathode material and its preparation, can solve the problems of unstable structure, capacity fading, and inability to exhibit high-voltage and high-rate performance, etc. Convenience, rate-type energy improvement, and excellent electrochemical performance
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Embodiment 1
[0029] Embodiment 1: The preparation method of the high-voltage high-rate lithium cobalt oxide positive electrode material adopts the following process steps.
[0030] (1) Lithium carbonate and cobalt oxide are added according to Li / Co=1.02 (mole), and magnesium carbonate is added according to Mg / Co=0.005 (mole); the above mixture is fully mixed with a three-dimensional mixer or a super mixer to obtain Disperse the primary mixture evenly.
[0031] (2) Sinter the primary mixture in an air atmosphere at 950-980°C for 12 hours; the resulting primary sintered product is crushed by air flow or high-speed rotating equipment, and sieved to obtain lithium cobaltate, with an average particle size (D50) of 2 ~4μm.
[0032] (3) Dissolve aluminum isopropoxide in absolute ethanol according to Al / Co=0.005 (mole), then add tetraisobutyl titanate according to Ti / Co=0.005 (mole), stir well and add the above-mentioned lithium cobaltate , fully stirred and mixed, and dried to obtain a secondar...
Embodiment 2
[0036] Embodiment 2: The preparation method of the high-voltage and high-rate lithium cobalt oxide positive electrode material adopts the following process steps.
[0037] (1) Lithium carbonate and cobalt oxide are added according to Li / Co=1.00 (mole), and magnesium carbonate is added according to Mg / Co=0.002 (mole); the above mixture is fully mixed with a three-dimensional mixer or a super mixer to obtain Disperse the primary mixture evenly.
[0038] (2) The primary mixture is sintered in an air atmosphere at 930-950°C for 10 hours; the obtained primary sintered product is crushed by airflow or high-speed rotating equipment, and sieved to obtain lithium cobaltate, and the average particle size (D50 ) is 2 to 4 μm.
[0039] (3) Dissolve aluminum isopropoxide in absolute ethanol according to Al / Co=0.003 (mole), then add tetraisopropyl titanate according to Ti / Co=0.003 (mole), stir well and add the above cobalt acid Lithium, stirred and mixed thoroughly, and dried to obtain a ...
Embodiment 3
[0043] Embodiment 3: The preparation method of the high-voltage and high-rate lithium cobalt oxide positive electrode material adopts the following process steps.
[0044] (1) Lithium carbonate and cobalt oxide are added according to Li / Co=1.03 (mole), and magnesium carbonate is added according to Mg / Co=0.01 (mole); the above mixture is fully mixed with a three-dimensional mixer or a super mixer to obtain Disperse the primary mixture evenly.
[0045] (2) Sinter the primary mixture in an air atmosphere at 900-920°C for 14 hours; the obtained primary sintered product is crushed by air flow or high-speed rotating equipment, and sieved to obtain lithium cobaltate, and the average particle size (D50 ) is 2 to 4 μm.
[0046] (3) Dissolve aluminum n-pentoxide in isopropanol according to Al / Co=0.001 (mole), then add tetraisooctyl titanate according to Ti / Co=0.01 (mole), stir well and add the above-mentioned cobalt acid Lithium, stirred and mixed thoroughly, and dried to obtain a sec...
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