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Preparation method of small-particle-size high-doping-amount niobium-tungsten-tantalum-cobaltosic oxide

A technology of cobalt tetroxide and small particle size, applied in the field of lithium ion batteries, can solve problems such as cumbersome processes, and achieve the effects of increasing the effective volume, inhibiting the growth rate, and increasing the number of formations

Active Publication Date: 2019-09-17
JINCHUAN GROUP LIMITED +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The preparation method of small particle size cobalt tetroxide used in this patent is cumbersome, which is obviously different from the patent of this application

Method used

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  • Preparation method of small-particle-size high-doping-amount niobium-tungsten-tantalum-cobaltosic oxide
  • Preparation method of small-particle-size high-doping-amount niobium-tungsten-tantalum-cobaltosic oxide
  • Preparation method of small-particle-size high-doping-amount niobium-tungsten-tantalum-cobaltosic oxide

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Using cobalt sulfate as raw material, prepare 10m 3 The cobalt solution with a cobalt concentration of 20g / L is A solution; configure 10m 3 The cobalt solution with a cobalt concentration of 160g / L is solution B; the mixed solution of sodium hydroxide solution with a volume ratio of 0.05:1 and ammonia solution added with hydrazine hydrate solution is solution c, wherein the concentration of sodium hydroxide solution is 200g / L, the concentration of ammonia solution is 180g / L, add 10ml of hydrazine hydrate solution with a mass concentration of 80% in every liter of ammonia solution; use niobium tungsten tantalum chloride as raw material, and configure niobium tetrachloride with a niobium concentration of 9.86g / L Ethanol solution is D solution;

[0031] Put D solution and C solution into the reaction kettle in parallel to prepare niobium, tungsten and tantalum crystal nuclei, the flow rate of D solution is 250L / h, the reaction pH value is controlled to be 8.8, the reacti...

Embodiment 2

[0037] Using cobalt nitrate as raw material, prepare 10m 3 The cobalt solution with a cobalt concentration of 30g / L is A solution; configure 10m 3 The cobalt solution with a cobalt concentration of 150g / L is solution B; the mixed solution of sodium hydroxide solution with a volume ratio of 0.08:1 and ammonia solution added with hydrazine hydrate solution is solution c, wherein the concentration of sodium hydroxide solution is 250g / L, the concentration of ammonia solution is 180g / L, add 15ml of hydrazine hydrate solution with a mass concentration of 80% per liter of ammonia solution; use niobium tungsten tantalum chloride as raw material, and configure tungsten hexachloride with a tungsten concentration of 9.86g / L Ethanol solution is D solution;

[0038] Add solution D and solution C to the reactor in parallel to prepare niobium, tungsten and tantalum nuclei. The flow rate of solution D in parallel is 250L / h, the reaction pH is controlled to be 8.8, the reaction temperature i...

Embodiment 3

[0044] Using cobalt chloride as raw material, prepare 10m 3 The cobalt solution with a cobalt concentration of 40g / L is A solution; configure 10m 3 The cobalt solution with a cobalt concentration of 140g / L is solution B; the mixed solution of sodium hydroxide solution with a volume ratio of 0.1:1 and ammonia solution added with hydrazine hydrate solution is solution c, wherein the concentration of sodium hydroxide solution is 300g / L, the concentration of ammonia solution is 180g / L, add 20ml of hydrazine hydrate solution with a mass concentration of 80% per liter of ammonia solution; use niobium tungsten tantalum chloride as raw material, and configure tantalum pentachloride with a tantalum concentration of 19.73g / L Ethanol solution is D solution;

[0045] Add solution D and solution C to the reactor in parallel to prepare niobium, tungsten and tantalum nuclei. The flow rate of solution D in parallel is 250L / h, the reaction pH is controlled to be 9.0, the reaction temperature...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a preparation method of small-particle-size high-doping-amount niobium-tungsten-tantalum-cobaltosic oxide for preparing high-voltage lithium cobaltate. The preparation process comprises the steps of: liquid preparation, niobium-tungsten-tantalum crystal nucleus preparation, synthesis reaction, aging, filtration, washing, drying and calcination. According to the method, the high-concentration cobalt solution is used in the synthesis starting stage, the concentration of the synthesized cobalt solution is reduced along with the increase of the synthesis time, the generation number of cobalt hydroxide crystal nuclei in the synthesis reaction starting stage is increased, the growth speed of cobalt hydroxide is favorably inhibited, and the cobalt hydroxide with compact crystals can be prepared.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a method for preparing cobalt tetraoxide with small particle size and high content of niobium, tungsten and tantalum, which is 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. co 3 o 4 It is a functional material with special structure and properties, Co 3 o 4 The market is already facing t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M10/0525
CPCH01M4/362H01M4/366H01M4/525H01M10/0525Y02E60/10
Inventor 陈晓闯赵宗明刘世红吴来红
Owner JINCHUAN GROUP LIMITED
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