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A kind of preparation method of magnesium-doped tricobalt tetroxide

A technology of tricobalt tetroxide and cobalt hydroxide, applied in the direction of cobalt oxide/cobalt hydroxide, etc., can solve problems such as cumbersome process, unfavorable industrial production, etc., and achieve the effect of increasing concentration, beneficial to growth, and reducing the number of crystal nuclei generated.

Active Publication Date: 2021-06-29
JINCHUAN GROUP LIMITED +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This patent requires multiple cycles of crystallization in the cobalt carbonate synthesis stage, the process is cumbersome, and it is not conducive to industrial production

Method used

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  • A kind of preparation method of magnesium-doped tricobalt tetroxide
  • A kind of preparation method of magnesium-doped tricobalt tetroxide
  • A kind of preparation method of magnesium-doped tricobalt tetroxide

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Experimental program
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Effect test

Embodiment 1

[0044] The production steps are the same as above, and will not be repeated here. The specific parameters in each step are as follows:

[0045] The configured A solution is 10m 3 The concentration of magnesium is 0.055g / L, the concentration of cobalt is 20g / L mixed solution of magnesium nitrate and cobalt nitrate; the prepared B solution is 10m 3 A magnesium nitrate and cobalt nitrate mixed solution with a magnesium concentration of 0.877g / L and a cobalt concentration of 160g / L; the prepared solution C is a mixed solution of sodium hydroxide solution and ammonia solution. Among them, the concentration of sodium hydroxide solution is 200g / L, the concentration of ammonia solution is 180g / L, 20ml of hydrazine hydrate solution with a mass concentration of 80% is added to every liter of ammonia solution, and the volume of ammonia solution and sodium hydroxide solution in C solution The ratio is 0.05.

[0046] Synthesis reaction: At the beginning of the synthesis reaction, add so...

Embodiment 2

[0053] The production steps are the same as above, and will not be repeated here. The specific parameters in each step are as follows:

[0054] The configured A solution is 10m 3 The concentration of magnesium is 0.123g / L, the concentration of cobalt is 30g / L mixed solution of magnesium sulfate and cobalt sulfate; the prepared B solution is 10m 3 A mixed solution of magnesium sulfate and cobalt sulfate with a magnesium concentration of 0.616g / L and a cobalt concentration of 150g / L; the prepared C solution is a mixture of sodium hydroxide solution and ammonia solution. Among them, the concentration of sodium hydroxide solution is 250g / L , the concentration of the ammonia solution is 180g / L, and 25ml of hydrazine hydrate solution with a mass concentration of 80% is added in every liter of the ammonia solution, and the volume ratio of the ammonia solution to the sodium hydroxide solution in the C solution is 0.08.

[0055] Synthesis reaction: At the beginning of the synthesis r...

Embodiment 3

[0062] The production steps are the same as above, and will not be repeated here. The specific parameters in each step are as follows:

[0063] The configured A solution is 10m 3 Magnesium concentration is 0.219g / L, cobalt concentration is the magnesium chloride and cobalt chloride mixed solution of 40g / L; The prepared B solution is 10m 3 Magnesium concentration is 0.767g / L, cobalt concentration is the mixed solution of magnesium chloride and cobalt chloride of 140g / L; The prepared C solution is the mixed solution of sodium hydroxide solution and ammonia solution. Wherein, the concentration of sodium hydroxide solution is 300g / L, the concentration of ammonia solution is 180g / L, 30ml of hydrazine hydrate solution with a mass concentration of 80% is added to every liter of ammonia solution, and the volume of ammonia solution and sodium hydroxide solution in C solution The ratio is 0.1.

[0064] Synthesis reaction: At the beginning of the synthesis reaction, add solution A to ...

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Abstract

The invention discloses a preparation method of magnesium-doped tricobalt tetroxide. In the method, magnesium is mixed into a cobalt solution, and the concentration gradient of the cobalt solution added to the reaction kettle increases as the synthesis time prolongs, and at the same time, the solid-liquid of the slurry in the reaction kettle is adjusted. Compared with wet synthesis, dense magnesium-doped cobalt hydroxide is synthesized. After the synthesis, the synthesized product is washed, dried and calcined to obtain magnesium-doped cobalt tetroxide product. The product obtained by this method is evenly distributed with magnesium doping, has high tap density, large specific surface area, and spherical or quasi-spherical shape.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of magnesium-doped tricobalt tetroxide used for preparing high-voltage lithium cobaltate. Background technique [0002] Lithium-ion batteries made of lithium cobalt oxide as the positive electrode material have the characteristics of light weight, large capacity, high specific energy, high working voltage, stable discharge, suitable for high-current discharge, good cycle performance, and long life. They are mainly used in 3C digital fields . [0003] Lithium cobalt oxide is developing in the direction of high voltage, high compaction, and high cycle performance, and the requirements for the raw material cobalt trioxide are getting higher and higher. [0004] Chinese invention patent CN201410362746.7 discloses "a preparation method of small particle size high-density spherical cobalt tetraoxide". The specific preparation method inclu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G51/04
CPCC01G51/04C01P2004/32C01P2004/51C01P2004/61C01P2006/11C01P2006/12C01P2006/80
Inventor 陈晓闯赵宗明刘世红吴来红
Owner JINCHUAN GROUP LIMITED
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