A kind of composite electrode material and preparation method thereof

A composite electrode and mixed solution technology, 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, increasing the resistivity, etc., so as to facilitate rapid transfer, prevent aggregation, and reduce contact resistance. Effect

Active Publication Date: 2019-07-19
JILIN UNIV +1
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  • 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 and the active material and increase the resistivity. The binder used will reduce the conductivity of the electrode material and hinder their application in high-performance supercapacitors

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  • A kind of composite electrode material and preparation method thereof
  • A kind of composite electrode material and preparation method thereof
  • A kind of composite electrode material and preparation method thereof

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[0032] The invention provides a kind of preparation method of composite electrode material, comprises the following steps:

[0033] 1) mixing soluble divalent nickel salt, soluble divalent cobalt salt, hexamethylenetetramine, lanthanum manganate and a solvent to obtain a mixed solution;

[0034] 2) adding nickel foam into the mixed solution obtained in the step (1) to carry out a hydrothermal reaction to obtain a precursor;

[0035] 3) Drying and annealing the precursor obtained in the step (2) in sequence to obtain a composite electrode material.

[0036] The invention mixes soluble divalent nickel salt, soluble divalent cobalt salt, hexamethylenetetramine, lanthanum manganate and solvent to obtain mixed solution.

[0037] In the present invention, the soluble divalent nickel salt is preferably nickel nitrate, nickel chloride, nickel acetate or nickel sulfate, more preferably nickel nitrate.

[0038] In the present invention, the soluble divalent cobalt salt is preferably c...

Embodiment 1

[0062] Dissolve 3.25g of lanthanum nitrate, 3.58g of manganese nitrate (50% solution) and 4.2g of citric acid (metal / citric acid molar ratio=1 / 1) in 50mL of deionized water, adjust the pH to 8 with ethylenediamine to form a solvent, 80°C constant temperature water bath until a small amount of light yellow solid is formed. After drying in a vacuum oven at 180°C for 10 hours, grinding, and annealing in a muffle furnace at 600°C for 4h (heating rate 5°C / min), the final product LaMnO was obtained after grinding 3 . figure 1 with figure 2 Respectively be the LaMnO that embodiment example 1 prepares 3 The scanning electron microscope and transmission electron microscope images 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.

Embodiment 2

[0064] (1) Disperse 290.79mg of nickel nitrate and 582.06mg of cobalt nitrate in 40mL of deionized water and 20mL of ethanol, stir at room temperature for 0.5h; add 841.14mg of hexamethylenetetramine into the above solution, stir to disperse evenly ; The LaMnO made in 100mg embodiment 1 3 The nanoparticles were dissolved in the mixed solution in step 2, and stirred for 0.5h to obtain a black mixed solution;

[0065] (2) Add the mixed liquid stirred in step (1) into a 100ml reaction kettle, move it to a constant temperature box and raise the temperature to 90°C, and keep it warm for 10h;

[0066] (3) Naturally cool to room temperature after the reaction is over, take out the nickel foam containing the sample, wash it three times with deionized water and three times with ethanol, and finally move it into a blast drying oven at 60°C for 12h; anneal at 300°C for 2h (heating Rate 5°C min -1 . ) to obtain LaMnO supported on nickel foam 3 @NiCo 2 o 4 Composite electrode materia...

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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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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/24H01G11/86H01G11/30
CPCY02E60/13
Inventor 田宏伟郎雪芹郑伟涛胡小颖
Owner JILIN UNIV
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