Preparation method of lithium cobalt oxide
A technology of lithium cobalt oxide and cobalt salt, which is applied in the field of preparation of lithium cobalt oxide, can solve the problems of high energy consumption, many processes, and difficult to control product morphology, and achieves low energy consumption, few processes, and regular and controllable morphology. Effect
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[0015] The embodiment of the present invention provides a preparation method of lithium cobaltate, which comprises the following steps:
[0016] S1, using a cobalt salt solution and an alkaline solution as reactants, and stirring while reacting in a controlled crystallization kettle with a buffer by a controlled crystallization method, to prepare spherical cobalt oxyhydroxide; and
[0017] S2, putting the spherical cobalt oxyhydroxide into a lithium hydroxide solution, and performing a hydrothermal reaction, so that lithium in the lithium hydroxide replaces hydrogen in the cobalt oxyhydroxide to generate spherical lithium cobaltate.
[0018] see figure 1 , The controlled crystallization kettle 100 includes a kettle body 10, a stirring device and a feeding device.
[0019] The stirring device 20 is used to stir the reactants accommodated in the kettle body 10 , and the stirring device includes a motor 22 , a stirring shaft 24 and a stirring paddle 26 . The motor 22 is connect...
Embodiment 1
[0045] 1) Add 4mol / L ammonia solution in a 4-liter controlled crystallization kettle as a buffer, mechanically stir vigorously, the stirring intensity is 1500 rpm, and slowly add 2mol / L cobalt chloride aqueous solution from both sides at the same time with a peristaltic pump And the sodium hydroxide aqueous solution of 4mol / L, feed rate is controlled at 0.5 milliliters per minute, obtains spherical cobalt oxyhydroxide.
[0046] 2) Take out the reaction product spherical cobalt oxyhydroxide in 1), repeatedly wash with deionized water and suction filter to preserve the obtained spherical cobalt oxyhydroxide;
[0047] 3) Mix 1 kg of the spherical cobalt oxyhydroxide obtained in 2) with an aqueous solution containing 400 g of saturated lithium hydroxide and put it into a high-pressure hydrothermal reaction kettle for hydrothermal reaction. The hydrothermal reaction kettle should be heated rapidly to 150°C and Insulated for 5 hours to obtain spherical lithium cobaltate;
[0048] 4...
Embodiment 2
[0052] 1) Add 8 mol / L ammonia solution into a 10-liter controlled crystallization kettle as a buffer, mechanically stir vigorously, the stirring intensity is 900 rpm, and slowly add 3 mol / L cobalt chloride aqueous solution from both sides at the same time with a peristaltic pump and the aqueous sodium hydroxide solution of 6mol / L, the feeding speed of two kinds of solutions all is controlled at 2 milliliters per minute, obtains spherical cobalt oxyhydroxide.
[0053] 2) Take out the reaction product spherical cobalt oxyhydroxide in 1), repeatedly wash with deionized water and suction filter to preserve the obtained spherical cobalt oxyhydroxide;
[0054] 3) Mix 3 kg of the spherical cobalt oxyhydroxide obtained in 2) with an aqueous solution containing 1 kg of saturated lithium hydroxide and put it into a high-pressure hydrothermal reaction kettle for hydrothermal reaction. The hydrothermal reaction kettle should be heated rapidly to 200°C and Insulated for 1 hour to obtain sp...
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