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Preparation method of aluminum-doped cobalt hydroxide for high-voltage LCO coating material

A technology of cobalt hydroxide and coating material, applied in the directions of cobalt oxide/cobalt hydroxide, circuit, positive electrode, etc., can solve the problems of easy spontaneous agglomeration, high instability of particle surface energy, weak local stirring intensity, etc.

Active Publication Date: 2020-01-03
취저우화여우코발트뉴머터리얼컴퍼니리미티드 +1
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AI Technical Summary

Problems solved by technology

[0004] At present, aluminum-doped cobalt hydroxide has the following difficulties: 1. When the particle size D50 of cobalt hydroxide reaches below 1 μm, the surface energy of the particles is highly unstable, and it is easy to spontaneously agglomerate, and the particles are very easy to agglomerate during the drying process, resulting in a larger D50; 2. Cobalt hydroxide mixed with aluminum, the aluminum hydroxide produced by the reaction is a common colloidal floc, which can exist stably and has a huge surface area, strong adsorption capacity, can absorb cobalt hydroxide and deepen the particle agglomeration phenomenon, and at the same time, the colloid causes the slurry The fluidity becomes worse, the local stirring strength in the slurry becomes weaker, and it is more difficult to disperse the nano-sized cobalt hydroxide particles after doping with aluminum, resulting in a larger D50 of cobalt hydroxide doped with aluminum

Method used

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  • Preparation method of aluminum-doped cobalt hydroxide for high-voltage LCO coating material
  • Preparation method of aluminum-doped cobalt hydroxide for high-voltage LCO coating material
  • Preparation method of aluminum-doped cobalt hydroxide for high-voltage LCO coating material

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Experimental program
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Effect test

Embodiment 1

[0021] 1. Prepare 80g / L cobalt chloride solution, add to every 1m 3 Add 4.614kg of aluminum chloride to the cobalt liquid and stir evenly;

[0022] 2. Dilute the industrial liquid caustic soda with water to prepare a sodium hydroxide solution with a concentration of 40g / L;

[0023] 3. Add 3m into the reactor 3 Base with pure water, and add sodium borohydride with 1% Co quality; start stirring, and add the cobalt-aluminum mixed salt solution and sodium hydroxide solution in steps 1 and 2 at the same time at room temperature, and the flow rate of the cobalt-aluminum mixed salt solution is 1000L / h, the pH of the reaction process is strictly controlled by the flow of sodium hydroxide solution to be above 12.0, and the reaction time of feeding is controlled to 8h. After 8h, stop feeding and raise the temperature of the reaction system to 40°C. After the temperature reaches the requirement, stir for 0.2h to form and disperse the particles open;

[0024] 4. The synthesized alumin...

Embodiment 2

[0027] 1. Prepare 120g / L cobalt sulfate solution, 3 Add 16.845kg of aluminum sulfate to the cobalt solution and stir evenly;

[0028] 2. Dilute the industrial liquid caustic soda with water to prepare a sodium hydroxide solution with a concentration of 60g / L;

[0029] 3. Add 3.5m 3 Base with pure water, and add acetone oxime with 1.5% Co quality; start stirring, and add the cobalt-aluminum mixed salt solution and sodium hydroxide solution in steps 1 and 2 at the same time at room temperature, and the flow rate of the cobalt-aluminum mixed salt solution is 1500L / h, strictly control the pH of the reaction process through the flow of sodium hydroxide solution to be above 12.0, and control the feeding reaction time to 5.5h. After 5.5h, stop feeding and raise the temperature of the reaction system to 50°C. After the temperature reaches the requirement, stir for 0.3h to let the particles form and scattered;

[0030] 4. The synthesized aluminum-doped cobalt hydroxide is press-fil...

Embodiment 3

[0033] 1. Prepare 160g / L cobalt nitrate solution, add to every 1m 3 Add 22.769kg of aluminum nitrate to the cobalt solution and stir evenly;

[0034] 2. Dilute the industrial liquid caustic soda with water to prepare a sodium hydroxide solution with a concentration of 80g / L;

[0035] 3. Add 4m into the reactor 3 Base with pure water, and add hydrazine hydrate with 2% Co mass; start stirring, and add the cobalt-aluminum mixed salt solution and sodium hydroxide solution in steps 1 and 2 at the same time at room temperature, and the flow rate of the cobalt-aluminum mixed salt solution is 2000L / h. Strictly control the pH of the reaction process through the flow of sodium hydroxide solution to be above 12.0, and the reaction time of feeding is controlled to 4h. After 4h, stop feeding and raise the temperature of the reaction system to 60°C. After the temperature reaches the requirement, stir for 0.4h to form and disperse the particles. ;

[0036] 4. The synthesized aluminum-dop...

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Abstract

The invention belongs to the technical field of preparation of lithium battery positive electrode materials, particularly relates to a cobalt hydroxide preparation method, and provides a preparation method of aluminum-doped cobalt hydroxide for a high-voltage LCO coating material, wherein the method comprises: carrying out wet co-precipitation reaction on a cobalt-aluminum mixed solution and a liquid alkali, adding an antioxidant during the process to protect the divalent cobalt from being oxidized into the trivalent cobalt, and improving the dispersity of the particles by controlling the reaction rate and the crystal nucleus growth rate; and carrying out filter pressing on the synthesized slurry, washing, carrying out low-temperature drying, and breaking by adopting a jet mill to finallyobtain an agglomeration-free aluminum-doped cobalt hydroxide finished product with D50 of less than 1 [mu]m. According to the invention, the aluminum-doped cobalt hydroxide prepared by the method is wide in aluminum doping range, wherein the aluminum doping range can reach 0.1-1%.

Description

technical field [0001] The invention belongs to the technical field of preparation of cathode materials for lithium batteries, and in particular relates to a preparation method of cobalt hydroxide. Background technique [0002] Lithium cobalt oxide (LCO) is superior to other ternary cathode materials such as lithium manganese oxide and lithium iron phosphate in terms of compaction density, high voltage, high capacity, and high temperature resistance. The preferred positive electrode material for batteries of similar electronic products (referred to as 3C electronics). With the development of 3C electronic products, people have higher and higher requirements for battery capacity. Researchers increase the specific capacity of lithium cobaltate by increasing the charge cut-off voltage of LCO and allowing more ions to participate in charge and discharge. At present, the 4.45V high-voltage LCO is gradually increasing in volume. The positive electrode material manufacturers adopt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/04H01M4/525H01M10/052
CPCC01G51/04H01M4/525H01M10/052H01M2004/028C01P2004/62C01P2004/51Y02E60/10
Inventor 张荣洲田礼平刘人生虞颖熊铜兴游小龙傅江浩
Owner 취저우화여우코발트뉴머터리얼컴퍼니리미티드
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