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LDH-based supercapacitor composite electrode material and preparation method and application thereof

A technology of 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, too fast capacitance decay, etc., and achieves the promotion of electron and ion transport. , the effect of increasing the specific surface area and enhancing the transmission capacity

Active Publication Date: 2019-05-17
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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  • LDH-based supercapacitor composite electrode material and preparation method and application thereof
  • LDH-based supercapacitor composite electrode material and preparation method and application thereof
  • LDH-based supercapacitor composite electrode material and preparation method and application thereof

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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 and preparation method and application thereof. The preparation method comprises the steps of firstly, preparing to obtain a MnCo-LDH nanowire array taking nickel foam as a substrate by a hydrothermal method; secondly, preparaing to obtain a MnCo LDH / C rough nanowire array taking the nickel foam as the substrate by calcination and carbonization; and thirdly, combining NiMn-LDH nanosheet and a MnCo-LDH / C nanowire to form a three-dimensional core-shell structure by an in-situ growth method. Compared with other nanometer structures such as nanoparticle, the formed three-dimensional core-shell nanowire array is beneficial for fully developing electrochemical activity. When the composite material is used as a supercapacitor electrode material, the composite material can be a pseudocapacitance electrode material and has relatively high specific capacity and rate charge-discharge performance; and meanwhile, the composite material also can be used as a positive electrode material of a supercapacitor device and has relatively 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 Applications(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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