Cobalt oxide of lithium battery grade and its preparation method

A cobalt oxide and lithium battery technology, which is applied in the direction of cobalt oxide/cobalt hydroxide, etc., can solve the problems of affecting the shape of lithium cobaltate, difficulty in uniform mixing, and high cost of cobalt oxide, so as to achieve easy industrial application and promotion, and anti-mixed wear of particles High-intensity, easy-to-apply effects

Active Publication Date: 2005-06-08
JIANGSU DANGSHENG MATERIAL TECH CO LTD
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The cobalt oxide produced by these technical solutions is either costly and complicated due to the introduction of expensive surfactants, or is dissociated in the lithium cobalt oxide compounding process due to weak agglomeration, or forms a compound due to ammonium oxalate as a precipitating agent. Rod-like shape, which affects the shape of lithium cobaltate, or the powder is too fine and the specific surface is too large to form unfavorable agglomeration (nano-powder), which is difficult to mix evenly into the precursor of lithium battery cathode materials. There are certain problems in the industrial application process, and with There are obvious differences between foreign battery grade cobalt oxide (OMG and Umicore) currently recognized by the market

Method used

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  • Cobalt oxide of lithium battery grade and its preparation method
  • Cobalt oxide of lithium battery grade and its preparation method
  • Cobalt oxide of lithium battery grade and its preparation method

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Embodiment 1

[0045]Cobalt chloride is dissolved with deionized water, the cobalt content in the solution is 195g / L, and the impurity content is less than 100ppm; Dissolve food-grade ammonium bicarbonate with hot deionized water, the temperature is 30°C, and the solution concentration is 185g / L; Stir and heat the ammonium bicarbonate solution to 65°C, and add the cobalt nitrate solution into the reaction kettle filled with ammonium bicarbonate at a flow rate of 2L / min under stirring at 105rpm; the ammonium-cobalt dosage ratio is 2.8; continue stirring for 60 minutes after the addition ; Filter the cobalt carbonate precipitate and wash twice with 80°C deionized water; put the washed cobalt carbonate in a drying oven and dry at 150°C for 2 to 5 hours; transfer to a well-ventilated and oxygen-enriched muffle Calcined in the furnace at 500°C for 5 hours, then put it into a tunnel kiln, controlled the atmosphere of the kiln to be slightly oxygen-enriched, calcined at 800°C for 10 hours, and obtai...

Embodiment 2

[0048] Add high-purity electrolytic metal cobalt to chemically pure nitric acid solution to dissolve, the cobalt content in the solution is 220g / L, the free acid is 1.0g / L, and the impurity content is less than 100ppm; dissolve food-grade ammonium bicarbonate with hot deionized water, The temperature is 30°C, the solution concentration is 195g / L; the ammonium bicarbonate solution is stirred and heated to 40°C, and the cobalt nitrate solution is added to the reaction kettle filled with ammonium bicarbonate at a flow rate of 2L / min under stirring at 105rpm; The ammonium cobalt dosage ratio is 3; the stirring is continued for 60 minutes after the addition; the cobalt carbonate precipitate is filtered and washed twice with deionized water; The bowl enters the tunnel kiln, the atmosphere of the kiln is controlled to be in an oxygen-rich state, and it is calcined at 900°C for 3 hours. After crushing, sieving, and grading, battery-grade cobalt oxide powder is obtained. The technical ...

Embodiment 3

[0051] Add high-purity electrolytic metal cobalt to chemically pure nitric acid solution to dissolve, the cobalt content in the solution is 175g / L, the free acid is 1.0g / L, and the impurity content is less than 100ppm; dissolve food-grade ammonium bicarbonate with hot deionized water, The temperature is 30°C, the solution concentration is 185g / L; the ammonium bicarbonate solution is stirred and heated to 65°C, and the cobalt nitrate solution is added to the reaction kettle filled with ammonium bicarbonate at a flow rate of 2L / min under stirring at 105rpm; The ammonium-cobalt dosage ratio is 4.5; after the addition, continue to stir for 60 minutes; filter the precipitated cobalt carbonate and wash it twice with deionized water; put the washed cobalt carbonate in a drying oven and dry at 150°C for 2 to 5 hours; then pack The bowl enters the tunnel kiln, the atmosphere of the kiln is controlled to be in an oxygen-rich state, and it is calcined at 920°C for 3 hours. After crushing,...

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Abstract

A process for preparing the cobalt oxide used for the positive electrode of Li ion battery includes such steps as reaction of cobalt chloride (or nitrate) solution on ammonium bicarbonate solution to obtain cobalt carbonate, calcining at 500-1000 deg.C to obtani Co3O4, pulverizing and classifying.

Description

technical field [0001] The invention belongs to the technical field of high-energy power source materials, and in particular relates to lithium battery grade cobalt oxide powder and a preparation method thereof. Background technique [0002] Lithium battery grade cobalt oxide is mainly used as raw materials for lithium ion battery materials lithium cobalt oxide, lithium nickel cobalt oxide, and lithium nickel cobalt manganese oxide. Life expectancy has a significant impact. In addition to strict chemical composition requirements, lithium battery grade cobalt oxide also has special requirements for physical indicators such as bulk density, particle size distribution, and particle size uniformity. [0003] Common preparation methods of cobalt oxide powder include cobalt salt pyrolysis method, sol-gel method, chemical spray method, etc. Among them, the latter two methods are commonly used in the preparation of thin film materials on different substra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/04
Inventor 白厚善刘亚飞
Owner JIANGSU DANGSHENG MATERIAL TECH CO LTD
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