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A hexagonal columnar cobalt oxyhydroxide material with a hollow structure and its preparation method

The technology of cobalt oxyhydroxide and hexagonal column is applied in the field of hexagonal columnar cobalt oxyhydroxide material and its preparation, which can solve the problem of less research on cobalt oxyhydroxide, and achieve the effects of narrow particle size distribution, simple process flow and mild reaction conditions.

Active Publication Date: 2020-05-19
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For cobalt oxyhydroxide, judging from published papers and patents, its synthesis process is still in its infancy, and there are relatively few studies on cobalt oxyhydroxide
However, there is no report on the hexagonal prism-shaped cobalt oxyhydroxide nanomaterials and preparation methods with a hollow structure.

Method used

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  • A hexagonal columnar cobalt oxyhydroxide material with a hollow structure and its preparation method
  • A hexagonal columnar cobalt oxyhydroxide material with a hollow structure and its preparation method
  • A hexagonal columnar cobalt oxyhydroxide material with a hollow structure and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0027] (1) Configure 50 mL of cobalt chloride aqueous solution with a concentration of 0.1 mol / L and 50 mL of ammonia solution with a concentration of 0.2 mol / L; (2) inject the above two solutions into a three-necked flask with the same flow rate (20 mL / min) via a convection pump. In the three-necked flask, nitrogen gas was passed into the three-necked flask in advance, and the reaction was carried out at 50°C and stirring for 30 minutes; (3) 200 mL of NaOH aqueous solution with a concentration of 0.4 mol / L was added, and aged for 30 minutes; (4) The nitrogen gas was removed, and the mass fraction of 10mL of 28% hydrogen peroxide, continue to age for 2h; (5) After the aging is over, the resulting suspension is filtered, washed, and dried (60°C) to prepare a hexagonal columnar cobalt oxyhydroxide with a hollow structure. Its TEM and SEM photos are attached figure 1 and 2 , see attached XRD spectrum image 3 . It can be seen that the length of the six sides of the obtained sa...

Embodiment 2

[0029] (1) Configure 50 mL of cobalt chloride aqueous solution with a concentration of 0.1 mol / L and 50 mL of ammonia solution with a concentration of 0.2 mol / L; (2) inject the above two solutions into a three-necked flask with the same flow rate (20 mL / min) via a convection pump. In the three-necked flask, nitrogen gas was passed into the three-necked flask in advance, and the reaction was carried out at 30°C and stirring for 30 minutes; (3) 200 mL of NaOH aqueous solution with a concentration of 0.4 mol / L was added, and aged for 30 minutes; (4) The nitrogen gas was removed, and the mass fraction of 28% hydrogen peroxide 10ml, continue to age for 2h, (5) after aging, the resulting suspension is filtered, washed, and dried (60°C), to prepare a hexagonal cobalt oxyhydroxide with a hollow structure, the obtained sample The lengths of the six sides are the same or different, all of which are 200-500nm, the longitudinal thickness is 150-200nm, and the volume of the middle cavity is...

Embodiment 3

[0031] (1) Prepare 50 mL of cobalt sulfate aqueous solution with a concentration of 0.1 mol / L and 50 mL of ammonia solution with a concentration of 0.2 mol / L; (2) inject the above two solutions into a three-necked flask at the same flow rate (100 mL / min) via a convection pump , into the three-necked flask in advance to feed nitrogen, and react at 50°C for 30 minutes under stirring conditions; (3) add 200 mL of NaOH aqueous solution with a concentration of 0.4 mol / L, and age for 30 minutes; (4) remove nitrogen, and add a mass fraction of 10 % sodium hypochlorite 20mL, continue to age for 2h; (5) after aging, the resulting suspension is filtered, washed, and dried to prepare a hexagonal cobalt oxyhydroxide with a hollow structure, and the lengths of the six sides of the obtained sample are the same Or different, both are 300-500nm, the longitudinal thickness is 150-200nm, and the volume of the middle cavity is 40%-80% of the total volume of the hexagonal prism. .

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Abstract

The invention provides a hexagonal columnar cobalt oxyhydroxide material with a hollow structure and a preparation method thereof, belonging to the field of inorganic materials. The cross-section of the hexagonal cobalt oxyhydroxide with a hollow structure is hexagonal, the lengths of the six sides can be the same or different, all are 200-500nm, the longitudinal thickness is 150-250nm, and the volume of the middle cavity is the total volume of the hexagonal prism. 30%-80% of the volume, and the specific process of its preparation method is as follows: (1) cobalt salt solution and ammonia solution are dripped into a three-necked flask, and react for a certain period of time under an inert atmosphere and stirring conditions; (2) add a strong base (3) remove the inert gas, add a certain amount of strong oxidant, and continue to age; (4) after the aging is completed, the resulting suspension is filtered, washed, and dried to obtain a hollow structure Hexagonal cobalt oxyhydroxide material. The invention has the advantages of simple process flow, mild reaction conditions, easy large-scale preparation and the like, and the obtained product has narrow particle size distribution, controllable shape and good reproducibility.

Description

technical field [0001] The invention belongs to the field of inorganic materials, and in particular relates to a hexagonal columnar cobalt oxyhydroxide material with a hollow structure and a preparation method thereof. [0002] technical background [0003] Cobalt hydroxide and its compounds are widely used in the fields of electrochemistry, catalysis, sensors and organic magnets. In recent years, with the development of lithium-ion batteries, cobaltous oxide and its compounds, as a battery material additive with excellent performance, have also increased their consumption. Lithium cobaltate is currently the most commonly used electrode material for lithium-ion batteries because of its advantages such as high discharge voltage, stable charge and discharge voltage, and high specific energy. As a battery material additive with excellent performance, lithium cobaltate can significantly improve the performance of the battery, increase the specific capacity and high output power ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/52H01M10/0525H01G11/46
CPCH01G11/46H01M4/52H01M10/0525Y02E60/10
Inventor 陈光文杨梅陈会会陶莎任明月
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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