Synthetic method for simultaneously preparing positive electrode material and negative electrode material of high-performance supercapacitor by taking Co-MOF array as precursor

A technology for supercapacitors and negative electrodes, which is applied in the manufacture of hybrid capacitor electrodes and hybrid/electric double layer capacitors, and can solve the problems of limited promotion and large-scale application

Pending Publication Date: 2022-06-24
QINGDAO UNIV OF SCI & TECH
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Problems solved by technology

Although supercapacitors have ultra-high power density and can complete a complete charge-discharge cycle in a few seconds, the performance of supercapacitor energy density is really unsatisfactory, generally lower than 30Wh kg -1 , limiting its further promotion and large-scale application

Method used

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  • Synthetic method for simultaneously preparing positive electrode material and negative electrode material of high-performance supercapacitor by taking Co-MOF array as precursor
  • Synthetic method for simultaneously preparing positive electrode material and negative electrode material of high-performance supercapacitor by taking Co-MOF array as precursor
  • Synthetic method for simultaneously preparing positive electrode material and negative electrode material of high-performance supercapacitor by taking Co-MOF array as precursor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A kind of synthetic method that uses Co-MOF array as precursor to simultaneously prepare positive and negative electrode materials of high-performance supercapacitor, comprises the following steps:

[0024] (1) Cobalt nitrate hexahydrate (Ni(NO 3 ) 2 ·6H 2 O) and dimethylimidazole (2-MI) were dissolved in deionized water respectively, then the above two solutions were mixed, and a piece of 1*1cm foam nickel (NF) or foam iron nickel (FNF) was vertically immersed in the above solution , standing at room temperature for 2 h to obtain Co-MOF@NF grown on nickel foam current collector and Co-MOF@FNF grown on iron nickel foam current collector. The morphology of Co-MOF@NF is shown in its scanning electron microscope ( figure 1 ); the crystallinity of Co-MOF@NF is shown in its powder X-ray diffraction pattern ( figure 2 ); the morphology of Co-MOF@FNF is shown in its scanning electron microscope ( image 3 ); the crystallinity of Co-MOF@FNF is shown in its powder X-ray di...

Embodiment 2

[0029] A Synthetic Method for Simultaneous Preparation of High-performance Supercapacitor Positive and Negative Electrode Materials Using Co-MOF Arrays as Precursors

[0030] Include the following steps:

[0031] (1) The preparation of Co-MOF@NF and Co-MOF@FNF precursors is the same as in Example 1.

[0032] (2) The preparation of CN-LDH is the same as in Example 1, and this process does not need to carry out NaVO to CN-LDH 3 Etching treatment.

[0033] (3) The preparation of CFV is the same as in Example 1.

[0034] (4) Directly immerse the obtained CN-LDH vertically into a solution containing 7.5mg mL -1 In 3 mL of thioacetamide (TAA) solution, the CNS material was prepared by reacting at 160 °C for 12 hours. The constant current charge and discharge of CNS at different scan rates are as follows: Figure 20 As shown in the figure, the CNS is calculated at 2mA cm -2 The specific capacity at the current density reaches 3252mF cm -2 . The preparation of CFVS is the same...

Embodiment 3

[0036] A kind of synthetic method that uses Co-MOF array as precursor to simultaneously prepare positive and negative electrode materials of high-performance supercapacitor, comprises the following steps:

[0037] (1) The preparation of the Co-MOF precursor is the same as in Example 1.

[0038] (2) The preparation of CNV is the same as in Example 1.

[0039] (3) The preparation of CFV is the same as in Example 1.

[0040] (4) Vertically immerse the obtained CNV into a solution containing 2.5mg mL -1 In 3 mL of thioacetamide (TAA) solution, the reaction was carried out at 160°C for 12 hours. Obtain CNVS-1 material. The constant current charge and discharge of CNVS-1 at different scan rates are as follows: Figure 21 As shown in the figure, CNVS-1 is calculated at 2mA cm -2 The specific capacity at the current density reaches 4096mF cm -2 . The preparation of CFVS is the same as in Example 1.

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Abstract

A synthesis method for simultaneously preparing a positive electrode material and a negative electrode material of a high-performance supercapacitor by taking a Co-MOF array as a precursor comprises the following steps: firstly, respectively dissolving Ni (NO3) 2.6 H2O and 2-MI in water according to a molar ratio of 1: (3-9), and vertically immersing 1 * 1cm foamed nickel (NF) or foamed iron nickel (FNF) to obtain Co-MOF-coated NF and Co-MOF-coated FNF; then soaking the Co-MOF coated NF in an ethanol solution containing 76 mg of Ni (NO3) 2 to prepare CN-LDH, and then soaking the CN-LDH in an aqueous solution containing 1-12 mmol L <-1 > of NaVO3 for standing to obtain CNV; the Co-MOF coated FNF is soaked in a Fe (NO3) 3.9 H2O aqueous solution with the concentration of 1-6 mg mL <-1 > to obtain CF-LDH, then the array is soaked in a NaVO3 aqueous solution with the concentration of 1-12 mmol L <-1 > to stand, and the CFV is obtained. CNV or CFV is immersed in a TAA solution containing 2.5 mg mL <-1 > to 10 mg mL <-1 >, a reaction is carried out for 12 h at the temperature of 160 DEG C, and a target product CNVS-x or CFVS (x = TAA solution concentration / 2.5) is obtained. According to the preparation strategy for constructing two trimetal sulfide composite materials based on the same Co-MOF precursor, the electron transfer rate is increased, and the energy density of the supercapacitor is enhanced.

Description

technical field [0001] The invention belongs to the technical field of functional nanocomposite materials, specifically, a synthesis method for simultaneously preparing two kinds of trimetallic sulfide composite materials using Co-metal organic framework material as a precursor and its electrochemical energy storage application. Background technique [0002] Supercapacitors, an electrochemical energy storage device widely used in hybrid electric vehicles, smart grids, and flexible electronics, have attracted increasing attention due to their high power density, long lifetime, environmental friendliness, and safety. Although supercapacitors have ultra-high power density and can complete a complete charge-discharge cycle in a few seconds, the performance of supercapacitor energy density is really unsatisfactory, generally lower than 30Wh kg -1 , limiting its further promotion and large-scale application. Electrode materials are the core of supercapacitors, so how to design hi...

Claims

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Application Information

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IPC IPC(8): H01G11/86H01G11/30
CPCH01G11/86H01G11/30
Inventor 肖振宇卜冉冉周凤鸣迟锦耀王磊
Owner QINGDAO UNIV OF SCI & TECH
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