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Method for preparing supercapacitor material by alkaline hydrolysis on cobalt aluminum double metal hydroxide

A supercapacitor and hydroxide technology, applied in chemical instruments and methods, hybrid/electric double layer capacitor manufacturing, cobalt compounds, etc., can solve the problems of active material detachment, electrode conductive network damage, electrode performance degradation, etc., and achieve crystallization Enhanced performance, increased charge and discharge mass specific capacitance, and excellent electrochemical performance

Inactive Publication Date: 2019-01-18
SHANGHAI INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And more importantly, the reaction causes the original electrode conductive network to be destroyed, the active material is detached, and the electrode performance declines.

Method used

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  • Method for preparing supercapacitor material by alkaline hydrolysis on cobalt aluminum double metal hydroxide
  • Method for preparing supercapacitor material by alkaline hydrolysis on cobalt aluminum double metal hydroxide
  • Method for preparing supercapacitor material by alkaline hydrolysis on cobalt aluminum double metal hydroxide

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Dissolve 1.16 grams of cobalt nitrate, 1.50 grams of aluminum nitrate (the molar ratio of cobalt to aluminum is 1:1) and 5.0 grams of urea in 150 ml of distilled water, raise the temperature to 100 ° C, keep stirring for 10 hours, filter, wash and dry That is, 0.60 g of pink cobalt-aluminum double hydroxide solid was obtained with a yield of 80%. figure 1 It is the XRD spectrum of the cobalt, aluminum double metal hydroxide that embodiment 1 obtains. The material has the structural characteristics of layered hydroxides. figure 2 It is the SEM spectrum of the cobalt, aluminum double metal hydroxide that embodiment 1 obtains. As can be seen from the figure, the material is in the form of flakes.

Embodiment 2

[0034] 10.0 g of cobalt chloride hexahydrate (CoCl 2 ·6H 2 O) and 12.9 grams of aluminum chloride hydrate (AlCl 3 ·6H 2 O) Mix, add 30.0 g of hexamethyleneimine into 500 ml of distilled water at room temperature; under rapid stirring, keep warm at 120° C. for 2 days, filter, wash with water three times, wash with ethanol three times, and dry to obtain a solid 0.67 g; about 67% yield. image 3 The XRD spectrum of cobalt, aluminum double metal hydroxide obtained by embodiment 2.

Embodiment 3

[0036] The implementation process of the alkaline hydrolysis process of the cobalt-aluminum double metal hydroxide obtained in embodiment 1 is: get 0.50 gram of solid product respectively, be placed in 20 milliliters of containers, add 16 milliliters of concentrations and be the potassium hydroxide of 7 moles per liter solution, stirred evenly, sealed, and placed in an environment of 60° C. for 2 hours; respectively cooled, filtered, washed three times with water and three times with ethanol, and dried to obtain 0.35 g of solids with a yield of 70%. Figure 4 For the XRD collection of supercapacitor materials obtained after alkali hydrolysis by embodiment 3. The results show that after alkaline hydrolysis treatment, the material still maintains the structural characteristics of layered hydroxide (LDH), and the crystallinity is enhanced. Figure 5 Obtain the SEM spectrum of supercapacitor material after the alkaline hydrolysis that is obtained by embodiment 3. It can be seen t...

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Abstract

The invention discloses a method for preparing a supercapacitor material by alkaline hydrolysis on a cobalt aluminum double metal hydroxide. The method disclosed by the invention comprises the following specific steps: (1) dissolving a cobalt metal salt and an aluminum metal salt in a molar ratio from 1:2 to 2:1 in water to form a mixed solution, and adding a precipitating agent for reaction to prepare the cobalt aluminum double metal hydroxide; (2) adding a strong alkaline solution into the cobalt aluminum double metal hydroxide, standing at a temperature of 20-120 DEG C to obtain the supercapacitor material. The supercapacitor material prepared by the method has excellent electrochemical performance; compared with a sample not subjected to alkaline hydrolysis, the maximum discharge specific capacitance is increased from 423.5 Faraday.gram<-1> to 485.7 Faraday.gram<-1> within the potential of 0 to 0.55 volt and at the current density of 800 milliampere.gram<-1>, and after 1,250 charge-discharge cycles, the discharge specific capacitance is increased from 205.5 Faraday.gram<-1> to 263.8 Faraday.gram<-1>.

Description

technical field [0001] The invention relates to a method for preparing a supercapacitor material by alkaline hydrolysis of cobalt-aluminum double metal hydroxide, and belongs to the technical field of new energy material manufacturing and energy storage and conversion. 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). Expressed by the general formula as [CoAl x (OH) 2(1+x) ]X n- x / n mH 2 O represents, in the formula, 6 OH - The ions coordinate Co and Al ions to form octahedra, and these octahedra share 6 edges to form the hydroxide layer, 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. Generally speaking, the molar ratio x / y between 2:1 and 4:1 has the structural characteristics of layered hydroxide. Co-Al layered hydroxid...

Claims

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Application Information

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IPC IPC(8): C01G51/00H01G11/30H01G11/86
CPCC01G51/006C01P2002/72C01P2004/03C01P2006/40H01G11/30H01G11/86Y02E60/13
Inventor 胡猛赵佳宇
Owner SHANGHAI INSTITUTE OF TECHNOLOGY
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