A preparation method for doping rare earth element tricobalt tetroxide

A technology of tricobalt tetroxide and rare earth elements, which is applied in the direction of cobalt oxide/cobalt hydroxide, etc., can solve the problems of unfavorable industrial production and cumbersome process, and achieve the effects of stabilizing growth, increasing the number of crystal nuclei, and inhibiting growth

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

AI Technical Summary

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 preparation method for doping rare earth element tricobalt tetroxide
  • A preparation method for doping rare earth element tricobalt tetroxide
  • A preparation method for doping rare earth element tricobalt tetroxide

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] A method for preparing large-grained rare-earth element cobalt tetroxide, specifically comprising the following steps:

[0053] Step (a), dosing

[0054] The configured A solution is 10m 3 Cobalt concentration is 20g / L cobalt nitrate solution, lanthanum concentration is 0.11g / L lanthanum nitrate mixed solution; the prepared B solution is 15m 3 Cobalt nitrate solution with a cobalt concentration of 160g / L, and a mixed solution of lanthanum nitrate with a lanthanum concentration of 0.88g / L; preparation of solution C: a mixed solution of sodium hydroxide solution and ammonia solution containing hydrazine hydrate, that is: the concentration of ammonia solution is 180g / L, add 5mL hydrazine hydrate solution with a mass concentration of 80% per liter of ammonia solution, and then mix it with a sodium hydroxide solution with a concentration of 200g / L in a volume ratio of 0.1:1.

[0055] Step (b), synthesis reaction

[0056] At the beginning of the synthesis reaction, add ...

Embodiment 2

[0064] A method for preparing large-grained rare-earth element cobalt tetroxide, specifically comprising the following steps:

[0065] Step (a), dosing

[0066] The configured A solution is 10m 3 Cobalt concentration is 30g / L cobalt sulfate solution, cerium concentration is 0.21g / L cerium nitrate mixed solution; The prepared B solution is 15m 3 A cobalt sulfate solution with a cobalt concentration of 150g / L, and a mixed solution of cerium nitrate with a cerium concentration of 1.04g / L; prepare solution C: a mixture of sodium hydroxide solution and ammonia solution containing hydrazine hydrate, that is, the concentration of the ammonia solution is 180g / L, add 15mL of hydrazine hydrate solution with a mass concentration of 80% per liter of ammonia solution, and then mix it with a sodium hydroxide solution with a concentration of 250g / L at a volume ratio of 0.15:1.

[0067] Step (b), synthesis reaction

[0068] At the beginning of the synthesis reaction, add the B solution ...

Embodiment 3

[0076] A method for preparing large-grained rare-earth element cobalt tetroxide, specifically comprising the following steps:

[0077] Step (a), dosing

[0078] The configured A solution is 10m 3 The cobalt concentration is 40g / L cobalt chloride solution, the yttrium nitrate mixed solution that yttrium concentration is 0.33g / L; The prepared B solution is 15m 3 The cobalt chloride solution that the cobalt concentration is 140g / L, the yttrium nitrate mixed solution that the yttrium concentration is 1.16g / L; Preparation C solution: be the mixed solution of sodium hydroxide solution and ammonia solution containing hydrazine hydrate, that is: the concentration of ammonia solution is 180g / L, add 20mL hydrazine hydrate solution with a mass concentration of 80% per liter of ammonia solution, and then mix it with a sodium hydroxide solution with a concentration of 300g / L at a volume ratio of 0.2:1.

[0079] Step (b), synthesis reaction

[0080] At the beginning of the synthesis re...

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Abstract

The invention discloses a method for preparing cobalt tetroxide doped with a rare earth element. In the method, the rare earth element is mixed into a cobalt solution, and as the synthesis time prolongs, the concentration of the cobalt solution added to the reactor increases or decreases in a gradient manner. At the same time, the solid-to-liquid ratio of the slurry in the reactor is adjusted, and evenly doped cobalt hydroxide is synthesized by wet method. After the synthesis is finished, the synthesized product is washed, dried, and calcined to obtain a product doped with rare earth element tricobalt tetroxide with large particle size or small particle size. Using this process, it is possible to prepare cobalt tetroxide products doped with La, Ce, Y, doping amount uniformly distributed, and spherical or quasi-spherical in shape.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a method for preparing large-grained rare earth element cobalt tetroxide doped with 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. co 3 o 4 It is a functional material with special structure and properties, Co 3 o 4 The market is already facing the status quo of gradual shrinkage, and the large-grained Co ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G51/04
CPCC01G51/04C01P2004/32C01P2004/61C01P2006/11C01P2006/12
Inventor 陈晓闯吴来红刘世红何艳
Owner JINCHUAN GROUP LIMITED
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