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A kind of LDH-based supercapacitor composite electrode material and its preparation method and application

A technology for supercapacitors and composite electrodes, which is applied in the field of preparation of MnCo-LDH/C/NiMn-LDH composite electrode materials, can solve the problems of limiting the practical application of energy storage devices, excessively fast capacitance decay, etc., and achieves the promotion of electron and ion transport. , the effect of increasing the specific surface area and high specific capacitance

Active Publication Date: 2021-02-12
北京鼎昆嘉业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the MnCo-LDH nanowires are in contact with the electrolyte, the active sites are fully exposed, resulting in too fast capacitance decay, which limits its practical application in energy storage devices.

Method used

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  • A kind of LDH-based supercapacitor composite electrode material and its preparation method and application
  • A kind of LDH-based supercapacitor composite electrode material and its preparation method and application
  • A kind of LDH-based supercapacitor composite electrode material and its preparation method and application

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Effect test

Embodiment 1

[0030] A kind of preparation and performance research of MnCo-LDH / C / NiMn-LDH composite electrode material based on nickel foam, comprising the following steps:

[0031] (1) Uniformly dissolve manganese nitrate tetrahydrate, cobalt nitrate hexahydrate, urea, and ammonium fluoride in 80 mL of deionized water to obtain dispersion 1. The amount of manganese nitrate tetrahydrate substance in the solution is 2mmol, the amount of cobalt nitrate hexahydrate substance is 4mmol, the amount of urea substance is 12mmol, and the amount of ammonium fluoride substance is 10mmol;

[0032] (2) Transfer the dispersion liquid 1 prepared in step (1) to a reaction kettle, put nickel foam (2cm×4cm), and conduct a hydrothermal reaction at 120° C. for 12 hours. The obtained MnCo-LDH based on nickel foam was rinsed three times with deionized water and ethanol respectively, and dried at 60°C for 8h;

[0033] (3) Soak the MnCo-LDH based on nickel foam obtained in step (2) in glucose solution for 24 h, ...

Embodiment 2

[0038] A kind of preparation and performance research of MnCo-LDH / C / NiMn-LDH composite electrode material based on nickel foam, comprising the following steps:

[0039] (1) Uniformly dissolve manganese nitrate tetrahydrate, cobalt nitrate hexahydrate, urea, and ammonium fluoride in 60 mL of deionized water to obtain dispersion 1. The amount of manganese nitrate tetrahydrate substance in the solution is 1mmol, the amount of cobalt nitrate hexahydrate substance is 3mmol, the amount of urea substance is 8mmol, and the amount of ammonium fluoride substance is 8mmol;

[0040] (2) Transfer the dispersion liquid 1 prepared in step (1) to a reaction kettle, put nickel foam (2cm×4cm), and conduct a hydrothermal reaction at 150°C for 10h. The obtained MnCo-LDH based on nickel foam was rinsed three times with deionized water and ethanol respectively, and dried at 60°C for 8h;

[0041] (3) Soak the MnCo-LDH based on foamed nickel obtained in step (2) in glucose solution for 24 h, and the...

Embodiment 3

[0045] A kind of preparation and performance research of MnCo-LDH / C / NiMn-LDH composite electrode material based on nickel foam, comprising the following steps:

[0046] (1) Uniformly dissolve manganese nitrate tetrahydrate, cobalt nitrate hexahydrate, urea, and ammonium fluoride in 70 mL of deionized water to obtain dispersion 1. The amount of manganese nitrate tetrahydrate substance in the solution is 3.5mmol, the amount of cobalt nitrate hexahydrate substance is 3.5mmol, the amount of urea substance is 21mmol, and the amount of ammonium fluoride substance is 14mmol;

[0047] (2) Transfer the dispersion liquid 1 prepared in step (1) to a reaction kettle, put nickel foam (2cm×2cm), and conduct a hydrothermal reaction at 130° C. for 14 hours. The obtained MnCo-LDH based on nickel foam was rinsed three times with deionized water and ethanol respectively, and dried at 60°C for 8h;

[0048] (3) Soak the MnCo-LDH based on foamed nickel obtained in step (2) in glucose solution for ...

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Abstract

The invention discloses an LDH-based supercapacitor composite electrode material, a preparation method and an application. The MnCo LDH nanowire array based on nickel foam was first prepared by hydrothermal method; then the MnCo LDH / C rough nanowire array based on nickel foam was prepared by calcination and carbonization; and then the NiMn ‑LDH nanosheets and MnCo‑LDH / C nanowires are combined to form a three-dimensional core-shell structure. Compared with other nanostructures such as nanoparticles, the formation of a three-dimensional core-shell nanowire array is conducive to giving full play to its electrochemical activity; the composite material is used as a super When the capacitor electrode material is applied, it can be used as a pseudocapacitive electrode material with high specific capacitance and rate charge and discharge performance; at the same time, it can also be used as anode material for supercapacitor devices with high energy density.

Description

technical field [0001] The invention belongs to the technical field of supercapacitor electrode material preparation, and in particular relates to the preparation of a nickel foam-based MnCo-LDH / C / NiMn-LDH composite electrode material and the research and application of its electrochemical performance. Background technique [0002] With the advent of the world's energy crisis, it is of great significance to explore environmentally friendly and sustainable energy storage devices and energy storage materials. Among them, as a high-efficiency energy storage and conversion device, supercapacitors have been widely studied because of their high power density, fast charge and discharge rate, and long cycle life. However, due to their low energy density, the practical application of supercapacitors has been restricted. . The quality of the electrode material directly determines the capacitive performance of the device. Therefore, designing a reasonable plan to prepare a high-perfor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/24H01G11/30H01G11/32H01G11/86
CPCY02E60/13
Inventor 徐雨艳全威陈敏姜德立徐箐孟素兹
Owner 北京鼎昆嘉业科技有限公司
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