Composite electrode material and preparation method thereof

A composite electrode and mixed solution technology, which is applied in the field of capacitors, can solve the problems of hindering the contact between the electrolyte and the active material, reducing the conductivity of the electrode material, and low specific surface area, so as to facilitate rapid transfer, prevent agglomeration, and increase the specific surface area.

Active Publication Date: 2018-08-31
JILIN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This traditional method of preparing electrodes by coating is time-consuming and labor-intensive, and the specific surface area is low, which will hinder the contact between the electrolyte

Method used

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  • Composite electrode material and preparation method thereof
  • Composite electrode material and preparation method thereof
  • Composite electrode material and preparation method thereof

Examples

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Example Embodiment

[0031] The invention provides a method for preparing a composite electrode material, including the following steps:

[0032] 1) Mixing soluble divalent nickel salt, soluble divalent cobalt salt, hexamethylenetetramine, lanthanum manganate and solvent to obtain a mixed solution;

[0033] 2) Adding foamed nickel to the mixed solution obtained in step (1) for hydrothermal reaction to obtain a precursor;

[0034] 3) The precursor obtained in the step (2) is dried and annealed sequentially to obtain a composite electrode material.

[0035] The present invention mixes soluble divalent nickel salt, soluble divalent cobalt salt, hexamethylenetetramine, lanthanum manganate and solvent to obtain a mixed solution.

[0036] In the present invention, the soluble divalent nickel salt is preferably nickel nitrate, nickel chloride, nickel acetate or nickel sulfate, and more preferably nickel nitrate.

[0037] In the present invention, the soluble divalent cobalt salt is preferably cobalt nitrate, cobalt...

Example Embodiment

[0060] Example 1

[0061] Dissolve 3.25g lanthanum nitrate, 3.58g manganese nitrate (50% solution) and 4.2g citric acid (metal / citric acid molar ratio = 1 / 1) in 50mL deionized water, adjust the pH to 8 with ethylenediamine to form a solvent, Constant temperature water bath at 80°C until a small amount of light yellow solid is formed. After drying in a vacuum oven at 180°C for 10 hours, grind and anneal in a muffle furnace at 600°C for 4 hours (heating rate 5°C / min). After grinding, the final product LaMnO is obtained. 3 . figure 1 with figure 2 They are LaMnO prepared in Example 1 3 The scanning electron microscope image and transmission electron microscope image of figure 1 with figure 2 It can be seen that the lanthanum manganate sample is mainly composed of irregular particles with a diameter of tens of nanometers.

Example Embodiment

[0062] Example 2

[0063] (1) Disperse 290.79mg of nickel nitrate and 582.06mg of cobalt nitrate in 40mL of deionized water and 20mL of ethanol, and stir for 0.5h at room temperature; add 841.14mg of hexamethylenetetramine to the above solution and stir to make the dispersion uniform ; 100mg of LaMnO prepared in Example 1 3 The nanoparticles are dissolved in the mixed solution of step 2, and stirred for 0.5h to obtain a black mixed solution;

[0064] (2) Add the stirred mixture in step (1) to a 100ml reactor, move it to a constant temperature box and raise the temperature to 90°C for 10 hours;

[0065] (3) After the reaction, cool to room temperature naturally, take out the foamed nickel containing the sample, wash with deionized water three times and ethanol three times, and finally move it into a 60 ℃ blast drying oven for drying for 12 hours; 300 ℃ annealing for 2 hours (heating Speed ​​5℃min -1 . ) To obtain LaMnO loaded on foamed nickel 3 @NiCo 2 O 4 Composite electrode materi...

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Abstract

The invention provides a preparation method of a composite electrode material. The preparation method comprises the following steps of performing mixing on soluble divalent nickel salt, soluble divalent cobalt salt, hexamethylene tetramine, lanthanum manganate and a solvent to obtain a mixed liquid; adding foamy nickel into the mixed liquid to be subjected to a hydrothermal reaction to obtain a precursor; and performing drying and annealing on the precursor in sequence to obtain the composite electrode material. A core-shell nanometer flower structure is grown on the conductive substrate foamynickel to be directly used as an electrode, so that use of a conductive agent and a binder in the conventional coating method can be avoided, and extra contact resistance is lowered; and through a synergistic effect of NiCo<2>O<4> and LaMnO<3>, the potential window is expanded and the energy density of a supercapacitor is improved.

Description

technical field [0001] The invention relates to the technical field of capacitors, in particular to a composite electrode material and a preparation method thereof. Background technique [0002] As a new type of high-efficiency energy storage device, supercapacitors have attracted extensive attention due to a series of advantages such as high power density, long life, and fast charge and discharge speed. It is very important to explore high-performance electrode materials to meet the world's challenges to efficient, safe, clean, and sustainable energy. Common electrode materials can be divided into three categories: carbon materials that store energy through electrostatic adsorption processes, Conductive polymers and transition metal oxide materials that rely on redox reactions on the surface and subsurface of electrode materials for energy storage. However, the comprehensive performance of each electrode material has more or less limitations in some aspects, and it cannot ...

Claims

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Application Information

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IPC IPC(8): H01G11/24H01G11/86H01G11/30
CPCH01G11/24H01G11/30H01G11/86Y02E60/13
Inventor 田宏伟郎雪芹郑伟涛胡小颖
Owner JILIN UNIV
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