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Preparation method of cobalt-coated cobalt-aluminum hydroxide supercapacitor material

Active Publication Date: 2022-04-12
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the interface impedance of the material has a great influence on its electrochemical performance, and the method of directly adding a conductive agent has no obvious effect on reducing the interface impedance, so it cannot significantly improve the electrode performance.

Method used

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  • Preparation method of cobalt-coated cobalt-aluminum hydroxide supercapacitor material
  • Preparation method of cobalt-coated cobalt-aluminum hydroxide supercapacitor material
  • Preparation method of cobalt-coated cobalt-aluminum hydroxide supercapacitor material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 11.7g of cobalt chloride hexahydrate (CoCl 2 ·6H 2 O) and 3.75g aluminum chloride hexahydrate (AlCl 3 ·6H 2 O) Mix (the molar ratio of cobalt to aluminum is 4:1), and add 20.0g of hexamethylenetetramine into 250mL of distilled water at room temperature; then, under rapid stirring, keep warm at 120°C for 2 days (48h) , the precipitation reaction fully occurred; after the reaction was completed, it was filtered, washed three times with water and ethanol successively, and dried to obtain 3.80 g of solid (cobalt-aluminum layered hydroxide) with a yield of about 72%.

[0037]Take 1.00 g of the solid cobalt-aluminum layered hydroxide prepared above, and add it to 40 mL of potassium hydroxide solution with a concentration of 7 mol / L, then add 0.20 g of polyvinylpyrrolidone and stir evenly; then add 1.00 g of Hexaammine cobalt trichloride, after stirring and dissolving, add 0.50g sodium borohydride, react for 30h, and the reaction temperature is 30°C; after the reaction is c...

Embodiment 2

[0043] Dissolve 1.16g of cobalt nitrate, 0.75g of aluminum nitrate (the molar ratio of cobalt to aluminum is 2:1) and 5.0g of urea (urea) in 150mL of distilled water, raise the temperature to 100°C, keep stirring, and keep warm for 10h to fully precipitate Reaction: After the reaction is completed, filter, wash, and dry to obtain 0.45 g of solid (cobalt-aluminum layered hydroxide), and the yield is about 81%. Such as image 3 As shown, the material has the structural characteristics of layered hydroxides (LDHs); such as Figure 4 As shown, the material is in flake form.

[0044] Take 1.00 g of the solid cobalt-aluminum layered hydroxide prepared above, and add it to 40 mL of potassium hydroxide solution with a concentration of 7 mol / L, then add 0.50 g of polyvinylpyrrolidone and stir evenly; then add 1.00 g of Hexaammine cobalt trichloride, after stirring and dissolving, add 0.50g sodium borohydride, react for 30h, and the reaction temperature is 30°C; after the reaction is ...

Embodiment 3

[0050] Dissolve 11.6g of cobalt nitrate, 15.0g of aluminum nitrate (the molar ratio of cobalt to aluminum is 1:1) and 25.0g of urea (urea) in 300mL of distilled water, raise the temperature to 100°C, keep stirring, and keep warm for 10h to fully precipitate Reaction: After completion of the reaction, filter, wash, and dry to obtain 5.0 g of solid (cobalt-aluminum layered hydroxide), with a yield of about 82%. Such as Figure 5 As shown, the material has the structural characteristics of layered hydroxides (LDHs); such as Figure 6 As shown, the material is flake-like in character.

[0051] Take 1.00 g of the solid cobalt-aluminum layered hydroxide prepared above, and add it to 40 mL of potassium hydroxide solution with a concentration of 7 mol / L, then add 0.50 g of polyvinylpyrrolidone and stir evenly; then add 1.00 g of Hexaammine cobalt trichloride, after stirring and dissolving, add 1.00g sodium borohydride, react for 5h, and the reaction temperature is 30°C; after the re...

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Abstract

The invention relates to a supercapacitor material, in particular to a preparation method of a cobalt-coated cobalt-aluminum hydroxide supercapacitor material, which comprises the following steps: mixing a cobalt complex and a cobalt-aluminum layered hydroxide with a strong alkali solution, adding a dispersing agent and a reducing agent, and stirring to obtain a cobalt-coated cobalt-aluminum hydroxide supercapacitor material; and coating the surface of the cobalt-aluminum layered hydroxide with metal cobalt through a reduction reaction to obtain the cobalt-coated cobalt-aluminum hydroxide supercapacitor material. Compared with the prior art, the surface of the cobalt-aluminum layered hydroxide is coated with a layer of metal cobalt, and the cobalt-aluminum layered hydroxide still can keep the structure and the electrochemical performance of the layered hydroxide (LDHs); and a layer of metal interface is introduced on the surface, so that the conductivity is enhanced, the charge-discharge mass specific capacitance is increased, and the electrochemical stability and the cycle performance are improved.

Description

technical field [0001] The invention relates to a supercapacitor material, in particular to a method for preparing a metal cobalt-coated cobalt aluminum hydroxide supercapacitor material. Background technique [0002] Co-Al layered hydroxides use trivalent metal ions such as Al to replace part of Co during material synthesis, thereby forming layered double hydroxides (LDHs for short), which can be expressed as [CoAl x (OH) 2(1+x) ]X n- x / n mH 2 O, where X n- It is an interlayer anion with n negative charges, and x, y and m are determined according to the stoichiometric composition of the compound. In this structure, 6 OH - The Co ions and Al ions are coordinated to form octahedra, and these octahedra share 6 sides to form the hydroxide layer. Generally speaking, the molar ratio x / y between 2 and 4:1 has the structural characteristics of layered hydroxide. Co-Al layered hydroxide has a large discharge specific capacitance (about 800 Faradays / g) and high power discharg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/00B22F1/18C23C18/34H01G11/30H01G11/86
CPCY02E60/13
Inventor 胡猛
Owner SHANGHAI INST OF TECH
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