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Composite electrode material and preparation method and application thereof

A composite electrode and mixed solution technology, which can be used in the manufacture of hybrid capacitor electrodes and hybrid/electric double-layer capacitors, etc., can solve problems such as undiscovered and LDHs agglomeration, and achieve improved cycle stability, fast conductive network, and improved energy density. Effect

Active Publication Date: 2021-10-19
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, MOFs-derived LDHs exhibit agglomeration
At present, there is no research report on the in-situ encapsulation of N-GQDs quantum dots in MOF-derived NiGa-LDHs electrode materials

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Preparation of N-GQDs: 0.42 g citric acid and 0.36 g urea were dissolved in 30 mL H 2 Ultrasonic dispersion in O for 2 hours, the mixed solution was transferred to a 50 mL stainless steel autoclave lined with polytetrafluoroethylene, heated at 180 °C for 5 hours; the product was centrifuged at 12000 rpm for 20 minutes, and the supernatant was taken at 80 °C Dried to obtain N-GQD powder, configured to a concentration of 1 mg·mL -1 The N-GQDs aqueous solution is standby;

[0031] (2) Preparation of Ni-MOF / NF: 1.2g Ni(NO 3 )2 •6H 2 O and 2.6 g of 2-methylimidazole (2-MI) were dissolved in 80 mL of distilled water, and the 2-MI aqueous solution was quickly poured into the Ni(NO 3 ) 2 •6H 2 O aqueous solution was stirred for 10 minutes to obtain a mixed solution, and a piece was cut into 1×3cm 2 The nickel foam was put into the mixed solution for aging for 2 hours, washed with water and ethanol several times, and dried at 60°C for 5 hours to obtain Ni-MOF / NF;

[0...

Embodiment 2

[0037] In this example, under the condition that other conditions remain unchanged, a comparative experiment is established to prepare NiGa-LDHs / N-GQDs-x / NF with different additions of N-GQDs, where x is the concentration of N-GQDs aqueous solution. The comparison experiment was the same as the preparation method described in Example 1, except that the concentration of the N-GQDs aqueous solution in step (3) was changed from 1 mg·mL -1 Replaced with 2, 3, 4 and 5 mg·mL, respectively -1 .

[0038] image 3 It is the CV figure of NiGa-LDHs / N-GQDs-x / NF prepared in embodiment 2; Figure 4 is the GCD diagram of Ni-MOF, NiGa-LDHs and NiGa-LDHs / N-GQDs-x / NF; from image 3 It can be seen that when the concentration of N-GQDs aqueous solution is 2 mg·mL -1 The performance of NiGa-LDHs / N-GQDs-2 / NF prepared at this time is the best. Depend on Figure 4 It can be seen that compared with the others, the discharge time of the prepared NiGa-LDHs / N-GQDs-2 / NF is the longest. After the cap...

Embodiment 3

[0040] In this example, Co-MOF derived carbon nanosheets (Carbon NSs) supported on carbon cloth were prepared. 0.004mol Co(NO 3 ) 2 •6H 2 O and 0.032 mol 2-MI were dissolved in 80 mL distilled water respectively, and the 2-MI aqueous solution was quickly poured into Ni(NO 3 ) 2 •6H 2 O aqueous solution was stirred for 10 minutes to obtain a mixed solution, and then cut into 1 × 3 cm 2 The carbon cloth was aged in the above mixed solution for 2 hours, washed with water and ethanol several times, dried at 60°C for 5 hours, and the obtained Co-MOF was dried at 5°C min -1 Heated to 930°C for 2 hours to prepare Co-MOF derived carbon nanosheets. The obtained Co-MOF-derived carbon nanosheets were used as anodes for asymmetric supercapacitors. The evaluation of electrochemical performance was carried out in the CHI660e electrochemical workstation (purchased from Shanghai Chenhua Instrument Co., Ltd.). Under the three-electrode system, the NiGa-LDHs / N-GQDs / NF electrode material ...

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Abstract

The invention belongs to the technical field of energy material preparation, and particularly relates to a composite electrode material and a preparation method and application thereof. According to the preparation method, the porous Ni-MOF / NF is prepared on the foamed nickel by taking Ni(NO3)2.6H2O and 2MI as raw materials, and the Ni-MOF has excellent mechanical properties, a staggered conductive network and rapid electron transmission. The prepared Ni-MOF / NF is put into an N-GQDs solution to be soaked, the N-GQDs have high conductivity, due to the fact that a large number of nitrogen functional groups are doped, the wettability of electrolyte is improved, and after gallium ions are added for etching, the high-performance NiGa-LDHs / N-GQDs / NF composite electrode material is prepared. The reaction of electrolyte ions and an active material is facilitated, the impedance of the material is reduced, and the cycling stability is improved. The asymmetric supercapacitor assembled by using the material as a positive electrode material has ultrahigh power density and energy density, and an effective way is provided for constructing a novel electrode material with high energy storage density, good cycle performance and good power density.

Description

technical field [0001] The invention belongs to the technical field of energy material preparation, and in particular relates to a composite electrode material and its preparation method and application. Background technique [0002] With the development of the global economy, a large amount of fossil fuels are burned, and the development of clean energy and related energy storage devices is imminent. Among many energy storage devices, supercapacitors are considered to be the most promising to overcome the world due to their superior power density, fast charging and discharging process, excellent cycle stability, wide operating temperature range, environmental protection and easy preparation. One of the clean energy storage devices for the energy crisis. Supercapacitors are mainly composed of electrode materials and electrolytes. Therefore, among many factors that affect the performance of supercapacitors, the performance of electrode materials is the key influencing factor...

Claims

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Application Information

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IPC IPC(8): H01G11/30H01G11/86
CPCH01G11/30H01G11/86Y02E60/13
Inventor 李春岩王会琴张高敏沙闻霍鹏伟王新坤闫研
Owner JIANGSU UNIV
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