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Bimetal ion doped manganese dioxide electrode and preparation method and application thereof

A technology of alkali metal ions and transition metal ions, which is applied in the field of energy storage, can solve the problems of unfavorable electrolyte ion diffusion and reduce the kinetic process of energy storage, and achieve the advantages of simple and easy preparation method, promotion of kinetic process, and excellent rate performance Effect

Active Publication Date: 2022-01-14
FOSHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method can improve the conductivity and stability of manganese oxides, it is not conducive to the diffusion of electrolyte ions in the solid phase of manganese oxides and reduces the kinetic process of energy storage.

Method used

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  • Bimetal ion doped manganese dioxide electrode and preparation method and application thereof
  • Bimetal ion doped manganese dioxide electrode and preparation method and application thereof
  • Bimetal ion doped manganese dioxide electrode and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0040] A double metal ion doped manganese dioxide electrode, comprising a foamed nickel substrate and manganese-based oxide nanosheets loaded on the surface of the foamed nickel substrate, the manganese-based oxide nanosheets include manganese dioxide and doped in manganese dioxide Na ions and Mo ions in.

[0041] The preparation method of the double metal ion doped manganese dioxide electrode comprises the following steps:

[0042] 0.5mol / L of Na 2 SO 4 solution and 0.04mmol / L Na 2 MoO 4 The solutions are mixed to obtain a mixed solution;

[0043] Dissolving manganese acetate in a mixed solution of deionized water, absolute ethanol and ethylene glycol, and aging for 3 days to obtain a manganese salt aging solution;

[0044] Place the nickel foam substrate in a reaction kettle filled with manganese salt aging solution, and react at 150-250°C for 2-10 hours to obtain a precursor electrode of trimanganese tetraoxide;

[0045] The trimanganese tetroxide precursor electrode wa...

Embodiment 2

[0055] A double metal ion doped manganese dioxide electrode, comprising a foamed nickel substrate and manganese-based oxide nanosheets loaded on the surface of the foamed nickel substrate, the manganese-based oxide nanosheets include manganese dioxide and doped in manganese dioxide Na ions and Mo ions in.

[0056] The preparation method of the double metal ion doped manganese dioxide electrode comprises the following steps:

[0057] 0.5mol / L of Na 2 SO 4 solution and 0.06mmol / L Na 2 MoO 4 The solutions are mixed to obtain a mixed solution;

[0058] Dissolving manganese acetate in a mixed solution of deionized water, absolute ethanol and ethylene glycol, and aging for 3 days to obtain a manganese salt aging solution;

[0059] Place the nickel foam substrate in a reaction kettle filled with manganese salt aging solution, and react at 150-250°C for 2-10 hours to obtain a precursor electrode of trimanganese tetraoxide;

[0060] The trimanganese tetroxide precursor electrode ...

Embodiment 3

[0063] A double metal ion doped manganese dioxide electrode, comprising a foamed nickel substrate and manganese-based oxide nanosheets loaded on the surface of the foamed nickel substrate, the manganese-based oxide nanosheets include manganese dioxide and doped in manganese dioxide Na ions and Mo ions in.

[0064] The preparation method of the double metal ion doped manganese dioxide electrode comprises the following steps:

[0065] 0.5mol / L of Na 2 SO 4 solution and 0.2mmol / L Na 2 MoO 4 The solutions are mixed to obtain a mixed solution;

[0066] Dissolving manganese acetate in a mixed solution of deionized water, absolute ethanol and ethylene glycol, and aging for 3 days to obtain a manganese salt aging solution;

[0067] Place the nickel foam substrate in a reaction kettle filled with manganese salt aging solution, and react at 150-250°C for 2-10 hours to obtain a precursor electrode of trimanganese tetraoxide;

[0068] The trimanganese tetroxide precursor electrode w...

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Abstract

The invention discloses a bimetallic ion doped manganese dioxide electrode and a preparation method and application thereof. The electrode comprises a base material and a manganese-based oxide nanosheet loaded on the surface of the base material, and the manganese-based oxide nanosheet comprises manganese oxide and bimetallic ions doped in the manganese oxide; the bimetallic ions comprise alkali metal ions or alkaline earth metal ions and transition metal ions, and the transition metal ions do not comprise manganese ions. According to the electrode, alkali metal ions or alkaline earth metal ions are doped in a manganese oxide layered structure, the diffusion resistance of electrolyte ions in the manganese oxide layered structure can be reduced, the kinetic process of energy storage is promoted, meanwhile, transition metal ions and Mn<2+> form oxometallate, and the manganese dissolution behavior can be effectively inhibited. The electrode has excellent rate capability and cycling stability, the specific capacity retention rate reaches 65-70F / g under the condition of 20A / g, and the capacity retention rate reaches 94-98% after 1000 times of cyclic charging and discharging.

Description

technical field [0001] The invention belongs to the technical field of energy storage, in particular to a double metal ion doped manganese dioxide electrode and its preparation method and application. Background technique [0002] As a new electrochemical energy storage device, supercapacitor has the advantages of short charge and discharge time, long cycle life, safe and clean, and can supplement the technical gap of secondary chemical batteries. At present, the mainstream electrode materials for supercapacitors include carbon materials, conductive polymers, and transition metal oxides. Among them, manganese oxide is rich in resources, friendly to the environment, has high electrochemical activity, and has a high theoretical capacitance (1370F / g), which is a very promising electrode material for supercapacitors. The capacitance of manganese oxide is contributed by three processes: the physical electrostatic adsorption of electrolyte ions on its surface, the faradaic redox ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/46H01G11/86
CPCH01G11/46H01G11/86Y02E60/13
Inventor 刘翠茵温元峰李景灵龙航宇翁沫炜
Owner FOSHAN UNIVERSITY
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