4.40V high-voltage lithium cobalt oxide material and production method thereof
A lithium cobalt oxide, high-voltage technology, applied in circuits, electrical components, battery electrodes, etc., to achieve the effect of improving morphology and ensuring cycle performance
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[0024] The preparation method of 4.40V high-voltage lithium cobalt oxide material provided by the present invention includes the following steps:
[0025] S1, selecting cobalt oxide A, mixing with a lithium source and a compound containing doping elements Mg, Al, Ti, and W, sintering, crushing, sieving, and removing iron to obtain lithium cobalt oxide material C1.
[0026] The lithium source is a mixture of one or more of lithium carbonate, lithium hydroxide and lithium oxalate, the median particle size of cobalt oxide A is 11-20 μm, and the molar ratio of lithium to cobalt is (0.90-1.10):1 The median particle size of the obtained lithium cobalt oxide material C1 is 13-22 μm. The compound containing doping elements Mg, Al, Ti, and W is derived from one or two of oxides, hydroxides and fluorides of each element. In this step, the sintering temperature is 1000-1100°C, and the holding time is 3-12h.
[0027] S2, selecting cobalt oxide B, mixing with a lithium source and a compound con...
Example Embodiment
[0038] Example one
[0039] Cobalt oxide with a D50 of 15 μm is selected, and the sources of doping elements Mg, Al, Ti, and W are magnesium hydroxide, aluminum oxide, titanium oxide, and tungsten oxide, respectively. Weigh cobalt oxide, lithium carbonate, magnesium hydroxide, aluminum oxide, titanium oxide, and tungsten oxide according to the molar ratio of lithium to cobalt at 1.025, and the doping element amount Mg-1000ppm, Al-550ppm, Ti-500ppm, W-500ppm. After they are mixed, they are sintered in a box furnace at 1100°C for 9 hours in an air atmosphere; the primary sintered product after sintering is crushed, iron-removed, and sieved to obtain a lithium cobalt oxide material C1 with a D50 of 20.2 μm.
[0040] Cobalt oxide with a D50 of 3 μm is selected, and the sources of doping elements Mg, Ni, and Mn are magnesium hydroxide, nickel oxide, and manganese dioxide, respectively. According to the molar ratio of lithium and cobalt to 1.0, the doping element amount Mg-1200ppm, Ni-...
Example Embodiment
[0044] Example two
[0045] Cobalt oxide with a D50 of 15 μm is selected, and the sources of doping elements Mg, Al, Ti, and W are magnesium hydroxide, aluminum oxide, titanium oxide, and tungsten oxide, respectively. Weigh cobalt oxide, lithium carbonate, magnesium hydroxide, aluminum oxide, titanium oxide, and tungsten oxide according to the molar ratio of lithium to cobalt at 1.025, and the doping element amount Mg-1000ppm, Al-550ppm, Ti-500ppm, W-500ppm. After they are mixed, they are sintered in a box furnace at 1100°C for 9 hours in an air atmosphere; the primary sintered product after sintering is crushed, iron-removed, and sieved to obtain a lithium cobalt oxide material C1 with a D50 of 20.2 μm.
[0046] Cobalt oxide with a D50 of 3 μm is selected, and the sources of doping elements Mg, Ni, and Mn are magnesium hydroxide, nickel oxide, and manganese dioxide, respectively. According to the molar ratio of lithium and cobalt to 1.0, the doping element amount Mg-1200ppm, Ni-...
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