Preparation method of high-voltage lithium cobalt oxide positive electrode material
A cathode material, lithium cobalt oxide technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as unevenness, and achieve the effect of easy operation, conducive to large-scale industrial production, and simple process
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[0042] Such as figure 1 Shown, the preparation method of high-voltage lithium cobalt oxide cathode material of the present invention, comprises the following steps:
[0043] Step 1: Preparation of doped tricobalt tetroxide
[0044] Step 1.1: Preparation of doped cobaltous hydroxide
[0045] Using cobalt-containing solution as cobalt source, sodium hydroxide as precipitating agent, ammonia water or EDTA solution as complexing agent, nitrogen or argon as protective gas, hydrazine hydrate solution or ascorbic acid as reducing agent, mix the compound doped with metal M, and use Batch reaction kettle, by controlling the number of crystal nuclei in the initial stage of synthesis, respectively controlling the pH value at 10.5-11, 9.5-10, and performing wet synthesis, the obtained doped cobaltous hydroxide is respectively recorded as small particle size doped type Cobaltous hydroxide, large particle size doped cobaltous hydroxide.
Embodiment 1
[0065] Using cobalt nitrate solution with a concentration of 80g / L as the cobalt source, sodium hydroxide as the precipitant, ammonia solution as the complexing agent, nitrogen as the protective gas, and hydrazine hydrate solution as the reducing agent, mix the compound doped with metal Al, and use intermittent Type reactor, control the ion concentration of doped metal Al at 500ppm, the temperature at 50°C, the flow rate of protective gas at 5L / min, and the amount of reducing agent accounted for 0.02% of the solution. By controlling the number of crystal nuclei in the initial stage of synthesis, The pH values are respectively controlled at 10.5-11 and 9.5-10, and wet synthesis is carried out to obtain small particle size doped cobaltous hydroxide and large particle size doped cobaltous hydroxide respectively. After the wet synthesis, the hydrogen peroxide solution with a pH value of 9.5 and a concentration of 10% was used to oxidize the small particle size doped cobaltous hyd...
Embodiment 2
[0069] Using cobalt chloride solution with a concentration of 140g / L as the cobalt source, sodium hydroxide as the precipitant, EDTA solution as the complexing agent, argon as the protective gas, and ascorbic acid as the reducing agent, mix the compound doped with metal Al, and use intermittent Type reactor, control the ion concentration of doped metal Al at 2000ppm, the temperature at 60°C, the flow rate of protective gas at 5L / min, and the amount of reducing agent accounted for 0.06% of the solution. By controlling the number of crystal nuclei at the initial stage of synthesis, The pH values are respectively controlled at 10.5-11 and 9.5-10, and the wet synthesis is carried out to obtain small particle size doped cobaltous hydroxide and large particle size doped cobaltous hydroxide respectively. After the wet synthesis, the hydrogen peroxide solution with a pH value of 10 and a concentration of 12.5% was used to oxidize the small particle size doped cobaltous hydroxide an...
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