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Preparation method of layered cobalt aluminium bihydroxy composite metal oxide electrode material

A technology of bis-hydroxyl compound and electrode material, applied in electrode manufacturing, hybrid capacitor electrode, capacitor manufacturing, etc., can solve the problems of underutilization of active substances, agglomeration between particles, insufficient crystal form, etc., and achieve electrochemical cycle. Good performance, good rate characteristics, uniform particle size

Inactive Publication Date: 2006-03-29
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this preparation method is complicated, and the specific capacitance of the product is low, and the active material has not been fully utilized.
[0006] In Document (2) Power Supply Technology, 2003, 27(3): 315, Liu Xianming et al. considered using doped Al to improve the electrochemical performance of electroactive materials, and prepared a layered cobalt-aluminum bilayer by chemical co-precipitation method. Hydroxide Co 0.67 Al 0.33 (CO 3 ) 0.165 (OH) 2 ·nH 2 O, single electrode mass specific capacitance up to 400F·g -1 , but the crystal form of the sample prepared by this method is not good enough, and the agglomeration phenomenon between particles is serious
[0007] In order to improve the crystallization degree of cobalt-aluminum double hydroxide, in literature (3) Applied Chemistry, 2003, 20 (6): 524, Liu Xianming et al. hydrothermally treated the sample synthesized in literature (2) at 130°C for 16h , the XRD spectrum shows that the crystal form of the sample after hydrothermal treatment is obviously better, but the single-electrode specific capacitance only increases by 15% after hydrothermal treatment, reaching 460F·g -1

Method used

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  • Preparation method of layered cobalt aluminium bihydroxy composite metal oxide electrode material
  • Preparation method of layered cobalt aluminium bihydroxy composite metal oxide electrode material
  • Preparation method of layered cobalt aluminium bihydroxy composite metal oxide electrode material

Examples

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Embodiment 1

[0027] Take 0.10mol of Co(NO 3 ) 2 and 0.05mol of Al(NO 3 ) 3 Dissolve in 150ml of deionized water to make a mixed salt solution, take 0.20mol of NaOH and 0.10mol of NaOH 2 CO 3Dissolve in 150ml of deionized water to make an alkaline solution; add the mixed salt solution and alkaline solution to the full back-mixed liquid film reactor at the same time at the same time, and mix them fully in the gap between the rotor and the stator after being dispersed by the liquid distributor , discharged from the discharge port, the rotor speed is controlled to be 4000rmp, the reaction temperature is 25°C, and the residence time of the material in the reactor is 2min; Stir and crystallize in a water bath for 10 hours; wash the crystallized substance with deionized water several times, filter until the pH value is less than 8, and then dry it in vacuum at 80°C for 5h; dry the dried substance at 2°C·min -1 The temperature was raised to 160°C for 5 hours at a constant temperature, and the...

Embodiment 2

[0029] Take 0.20mol of CoSO 4 and 0.025mol of Al 2 (SO 4 ) 3 Dissolve in 150ml of deionized water to make a mixed salt solution, take 0.20mol of NaOH and 0.10mol of NaOH 2 CO 3 Dissolve in 150ml of deionized water to make an alkaline solution; add the mixed salt solution and alkaline solution to the full back-mixed liquid film reactor at the same time at the same time, and mix them fully in the gap between the rotor and the stator after being dispersed by the liquid distributor , discharged from the discharge port, the rotor speed is controlled to be 3500rmp, the reaction temperature is 35°C, and the residence time of the material in the reactor is 1min; Stir and crystallize in a water bath for 15 hours; wash the crystallized substance with deionized water several times, filter until the pH value is less than 8, and then dry it in vacuum at 70°C for 5h; dry the dried substance at 2°C·min -1 The rate is raised to 200°C for 5 hours of constant temperature roasting, and then...

Embodiment 3

[0031] Take 0.15mol of CoCl 2 and 0.05mol of AlCl 3 Dissolve in 150ml of deionized water to make a mixed salt solution, take 0.15mol of NaOH and 0.10mol of NaOH 2 CO 3 Dissolve in 150ml of deionized water to make an alkaline solution; add the mixed salt solution and alkaline solution to the full back-mixed liquid film reactor at the same time at the same time, and mix them fully in the gap between the rotor and the stator after being dispersed by the liquid distributor , discharged from the discharge port, the rotor speed is controlled to be 5000rmp, the reaction temperature is 25°C, and the residence time of the material in the reactor is 3min; Stir and crystallize in a water bath for 15 hours; wash the crystallized substance with deionized water several times, filter until the pH value is less than 8, and then dry it in vacuum at 80°C for 10h; dry the dried substance at 5°C·min -1 The temperature was raised to 160°C for 5 hours at a constant temperature, and then cooled t...

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Abstract

The invention relates to a method for preparing a sandwich Co-Al-hydroxide composite metal oxide (Co-Al-LDH) electrode material of super capacitor, belonging to the technical field of preparing the electrode material of super capacitor. The invention uses an all-returning mixed solution film reactor to make coprecipitation reaction on Co-Al mixed salt solution and basic solution, making nucleation / crystallization separation, controlling the nucleating and growing conditions of the crystal, respectively, then baking at a certain temperature, and fully exposing the electrochemical active situ of the Co on the basis of keeping the sandwich of Co-Al-LDH. The prepared Co-Al-LDH has the advantages of high specific capacitance, good multiplication property, and excellent electrochemical circulating performance.

Description

technical field [0001] The invention relates to a method for preparing a layered structure cobalt-aluminum double-hydroxy composite metal oxide supercapacitor electrode material, which belongs to the technical field of supercapacitor electrode material preparation. Background technique [0002] Supercapacitors have the advantages of high energy density of secondary batteries and high power density of conventional physical (or electrolytic) capacitors. In addition, they are environmentally friendly, wide operating temperature range, and long cycle life. New energy storage devices have broad application prospects in electric vehicles, mobile communications, aerospace, national defense technology and new energy development. Electrode materials are an important part of supercapacitors and a key factor affecting the performance and production cost of supercapacitors. Therefore, the research and development of high-performance and low-cost electrode materials is an important part ...

Claims

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Application Information

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IPC IPC(8): H01G9/04H01G13/00H01M4/04H01M14/00H01G11/46
CPCY02E60/13H01G9/155H01G9/058H01G11/46H01G11/22
Inventor 段雪杨文胜王毅
Owner BEIJING UNIV OF CHEM TECH
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