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Method for continuously producing large-particle spherical cobalt carbonate

A large particle, cobalt carbonate technology, applied in the direction of cobalt carbonate, etc., can solve the problems of affecting the particle size distribution and the continuous consistency of tapped density of the product, difficult to meet the large-scale production of large particle spherical cobalt carbonate, difficult to reduce production costs and other problems, To achieve the effect of friendly production environment, high sphericity and improved electrochemical performance

Active Publication Date: 2015-04-29
CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention patents retrieved above solve the problems of poor product consistency and low production efficiency to varying degrees, but because ammonium bicarbonate is used as a precipitant, the environment is polluted, and the complexation effect reduces the cobalt deposition rate and affects the product. The consistency of particle size distribution and tap density; the subsequent treatment of ammonium salt in the reaction mother liquor and the adoption of aging process not only make it difficult to reduce the production cost, but also limit the further improvement of production efficiency, and it is difficult to meet the requirements of large-scale production of large particle spherical The need for cobalt carbonate

Method used

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  • Method for continuously producing large-particle spherical cobalt carbonate
  • Method for continuously producing large-particle spherical cobalt carbonate
  • Method for continuously producing large-particle spherical cobalt carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] Step 1: Making a suspension containing cobalt carbonate seeds with small particle size

[0088] ⑴ Prepare the solution

[0089] Take industrial grade cobalt chloride raw material, be mixed with 2.0mol / L cobalt chloride aqueous solution, be recorded as solution a;

[0090] Take technical grade sodium carbonate raw material, be mixed with 2.0mol / L sodium carbonate aqueous solution, be recorded as solution b;

[0091] ⑵Preparation of small particle size cobalt carbonate seed crystal reaction bottom liquid

[0092] Controlled by a metering pump, pump 20L of solution a prepared in step 1 (1) into a stainless steel reactor with an effective volume of 3000L, and add deionized water to the reactor to adjust to Co in the solution. 2+ The concentration of the concentration is 0.04mol / L, as the small particle size cobalt carbonate seed crystal reaction bottom liquid, the stirring blade of the reactor can be fully stirred to the small particle size cobalt carbonate seed crystal r...

Embodiment 2

[0121] Step 1 makes a suspension containing small particle size cobalt carbonate seeds

[0122] The production process is exactly the same as step 1 in Example 1;

[0123] step 2

[0124] ⑴Preparation of large particle spherical cobalt carbonate reaction bottom liquid

[0125] Manufacturing process is exactly the same as step 2 (1) in embodiment 1;

[0126] ⑵Make solution d

[0127] Manufacturing process is exactly the same as step 2 (2) in embodiment 1;

[0128] (3) Transfer part of the solution d

[0129] Use a centrifugal pump to transfer the 2200L solution d in the reaction kettle in step 2 (2) to a stainless steel airtight pressure filter washing machine, and leave the rest in the reaction kettle;

[0130] ⑷solid-liquid separation

[0131] Manufacturing process is exactly the same as step 2 (4) in embodiment 1;

[0132] ⑸ drying

[0133] Production process is exactly the same as step 2 (5) in embodiment 1, promptly makes the large particle cobalt carbonate powder ...

Embodiment 3

[0148] Step 1 makes a suspension containing small particle size cobalt carbonate seeds

[0149] The production process is exactly the same as step 1 in Example 1;

[0150] step 2

[0151] ⑴Preparation of large particle spherical cobalt carbonate reaction bottom liquid

[0152] Manufacturing process is exactly the same as step 2 (1) in embodiment 1;

[0153] ⑵Make solution d

[0154] Manufacturing process is exactly the same as step 2 (2) in embodiment 1;

[0155] (3) Transfer part of the solution d

[0156] Use a centrifugal pump to transfer the 2400L solution d in the reaction kettle in step 2 (2) to a stainless steel airtight pressure filter washing machine, and leave the rest in the reaction kettle;

[0157] ⑷solid-liquid separation

[0158] Manufacturing process is exactly the same as step 2 (4) in embodiment 1;

[0159] ⑸ drying

[0160] Production process is exactly the same as step 2 (5) in embodiment 1, promptly makes the large particle cobalt carbonate powder ...

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Abstract

The invention relates to a method for continuously producing large-particle spherical cobalt carbonate. The method comprises the following steps: manufacturing a turbid liquid containing small-particle-size cobalt carbonate seed crystal and manufacturing a turbid liquid containing large-particle spherical cobalt carbonate, stirring the turbid liquid containing the small-particle-size cobalt carbonate seed crystal and the turbid liquid containing large-particle-size cobalt carbonate to form a mixed liquid, carrying out solid-liquid separation, washing and filter pressing to obtain a filter cake as a large-particle cobalt carbonate filter cake, drying the filter cake, and repeatedly operating to obtain the large-particle cobalt carbonate powder. According to the method disclosed by the invention, the small-particle-size cobalt carbonate seed crystal is adopted to control the particle size of the large-particle cobalt carbonate in reaction mother liquor, so that the degree of sphericity of cobalt carbonate produced by continuous production can be ensured to be high, the particle size can be stably controlled within the range of 15+ / -0.5 microns, and the consistency and the stability of the particle size of the large-particle spherical cobalt carbonate through large-scale continuous production can be realized; the method is simple in process, easy to operate and low in cost, and can provide the high-quality raw material for producing high-end lithium cobalt oxide; the carbonate is used as a precipitant, so that the environment can be optimized; the production efficiency can be improved, and the wide application prospect can be achieved.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials for lithium ion batteries, in particular to a method for continuously producing large-particle spherical cobalt carbonate. Background technique [0002] Lithium cobalt oxide batteries have the advantages of stable structure, high specific capacity, and outstanding comprehensive performance, and are currently one of the most mature cathode materials in lithium-ion batteries. [0003] However, due to the safety problems of lithium cobalt oxide itself, its application in power batteries and high-power batteries is limited. It has been found through research that increasing the primary crystal grains of lithium cobalt oxide can not only improve the safety performance of lithium cobalt oxide cathode material, but also increase the volumetric energy density of the battery without reducing the comprehensive electrical properties of lithium cobalt oxide. The research and development ...

Claims

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Application Information

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IPC IPC(8): C01G51/06
Inventor 许国峰樊勇利李平刘攀刘平
Owner CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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