Lanthanum-aluminum-magnesium in-situ co-doped cobaltosic oxide material and preparation method thereof
A technology of cobalt tetroxide and co-doping, applied in chemical instruments and methods, cobalt oxide/cobalt hydroxide, inorganic chemistry, etc., to achieve the effects of slowing down the precipitation rate, improving structural stability, and improving diffusion efficiency
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[0026] The preparation method of the in-situ lanthanum-aluminum-magnesium co-doped cobalt tetroxide material of the present invention comprises the following steps:
[0027] (1) Cobalt salt solution is prepared; the cobalt salt in the cobalt salt solution is one or more of cobalt chloride, cobalt sulfate, and cobalt nitrate; the concentration of cobalt ions in the cobalt salt solution is 65g / L-195g / L.
[0028] (2) preparing aluminum salt solution; the aluminum salt in the aluminum salt solution is aluminum sulfate. The concentration of aluminum ions in the aluminum salt solution is 0.6g / L-6.0g / L.
[0029] (3) Prepare lanthanum salt solution and magnesium salt solution; the lanthanum salt in the lanthanum salt solution is lanthanum chloride, and the concentration of lanthanum ion in the lanthanum salt solution is 0.3g / L-1.2g / L. The magnesium salt in the magnesium salt solution is one or both of magnesium chloride and magnesium sulfate, and the concentration of magnesium ions i...
Embodiment 1
[0036] The lanthanum chloride solution that the lanthanum ion concentration is 1.2g / L and the magnesium chloride solution that the magnesium ion concentration is 1.2g / L are squeezed into the aluminum sulfate solution that the aluminum ion concentration is 3.6g / L by metering pump, the lanthanum chloride solution, The volume ratio of the magnesium chloride solution and the aluminum sulfate solution is 1:1:1 to obtain a mixed solution.
[0037] The cobalt chloride solution, the mixed solution and the ammonium bicarbonate solution with a cobalt ion concentration of 120g / L are respectively added to the reaction kettle with deionized water in parallel flow through a metering pump to carry out coprecipitation reaction, and the three metal-containing La-Al-Mg co-doped flake cobalt carbonate. The amount of deionized water added is 20% of the volume of the reactor, and the volume ratio of the cobalt chloride solution, mixed solution, and ammonium bicarbonate solution added to the reacto...
Embodiment 2
[0046] The lanthanum chloride solution that the lanthanum ion concentration is 0.3g / L and the magnesium chloride solution that the magnesium ion concentration is 0.3g / L are squeezed into the aluminum sulfate solution that the aluminum ion concentration is 1.2g / L by metering pump, the lanthanum chloride solution, The volume ratio of the magnesium chloride solution and the aluminum sulfate solution is 1:1:1 to obtain a mixed solution.
[0047] The cobalt chloride solution, the mixed solution, and the ammonium bicarbonate solution with a cobalt ion concentration of 80g / L are respectively added to a reaction kettle with deionized water in parallel flow through a metering pump to carry out a coprecipitation reaction to obtain La-Al-Mg co-doped flake cobalt carbonate. The amount of deionized water added is 30% of the volume of the reactor, and the volume ratio of the cobalt salt solution, mixed solution, and ammonium bicarbonate solution added to the reactor is 1.5:3:2; the concentr...
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