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Method for realizing in-situ growth of cobalt-manganese double-metal hydroxide composite material through using nickel foam as substrate

A hydroxide, in-situ growth technology, applied in the field of material chemistry, can solve the problems of reducing the specific capacitance of transition metals, and achieve the effects of simple equipment, high performance and easy operation

Inactive Publication Date: 2018-10-02
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practice, due to the use of binders and other factors in the preparation of electrodes, the specific capacitance of transition metals decreases.

Method used

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  • Method for realizing in-situ growth of cobalt-manganese double-metal hydroxide composite material through using nickel foam as substrate
  • Method for realizing in-situ growth of cobalt-manganese double-metal hydroxide composite material through using nickel foam as substrate
  • Method for realizing in-situ growth of cobalt-manganese double-metal hydroxide composite material through using nickel foam as substrate

Examples

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preparation example Construction

[0019] The invention provides a method for preparing a foamed nickel / cobalt-manganese double metal hydroxide electrode material, more specifically, a composite material in which needle-shaped cobalt-manganese double metal hydroxides are grown in situ on a base based on three-dimensional foamed nickel. To improve the cycle stability and poor specific capacitance of transition metal hydroxides. And it does not need the characteristics of binding agent to improve the electrochemical performance of the composite material. The present invention comprises the following experimental steps:

[0020] (1) Foamed nickel pretreatment: ultrasonically clean the foamed nickel several times with water, ethanol, acetone, and water respectively, dry it in a vacuum drying oven, and finally weigh it.

[0021] (2) Preparation of cobalt-manganese double metal hydroxide: Weigh a certain amount of manganese sulfate hydrate and cobalt nitrate hexahydrate, dissolve them in deionized water, and obtain a...

Embodiment 1

[0026] (1) Foamed nickel pretreatment: ultrasonically clean the foamed nickel several times with water, ethanol, acetone, and water respectively, dry it in a vacuum drying oven, and finally weigh it.

[0027] (2) Preparation of cobalt-manganese double hydroxide: Weigh manganese sulfate hydrate and cobalt nitrate hexahydrate, dissolve them in 35 mL deionized water, and obtain a homogeneous solution with a cobalt-manganese molar ratio of 4:1 after ultrasonication. Then dissolved in urea and ammonium fluoride and ultrasonically treated; in the mixed solution, the molar concentration of manganese sulfate hydrate was 1mol / L, the molar concentration of cobalt nitrate hexahydrate was 4mol / L, the concentration of urea was 2mol / L, ammonium fluoride The concentration is 0.2mol / L;

[0028] (3) Preparation of foamed nickel / cobalt-manganese double metal hydroxide: transfer the ultrasonically mixed solution to a polytetrafluoroethylene stainless steel reactor, soak nickel foam with a size o...

Embodiment 2

[0031] The difference between Example 2 and Example 1 is that in (2) the process of preparing the solution, the molar ratio of cobalt to manganese is 3:1, and the rest of the steps are the same as in Example 1. figure 2 It is a scanning electron micrograph of the foamed nickel / cobalt-manganese double metal hydroxide composite electrode material prepared in Example 2 of the present invention when the molar ratio Co:Mn=3:1. Figure 4 It is the XRD pattern of the foamed nickel / cobalt-manganese double metal hydroxide composite electrode material prepared in Example 2 of the present invention.

[0032] Electrochemical performance test results show that: when the current density is 0.5Ag -1 , the specific capacitance value is 1550F g -1 , and the efficiency is 93.2% after 3000 cycles.

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Abstract

The invention discloses a method for realizing in-situ growth of cobalt-manganese double-metal hydroxide composite material through using nickel foam as a substrate. The method comprises the steps ofperforming in-water ultrasonic dispersion of cobalt salt, manganese salt, urea and ammonium fluoride to uniform, thereby obtaining cobalt-manganese double-metal hydroxide precursor solution; immersingthe preprocessed nickel foam into the cobalt-manganese double-metal hydroxide precursor solution, performing a hydro-thermal reaction, and after reaction, performing filtering, washing and drying forobtaining a nickel foam / cobalt-manganese double-metal hydroxide composite electrode material. The composite material according to the invention has advantages of excellent conductive performance, stable chemical property and controllable morphology. The needle-shaped cobalt-manganese double-metal hydroxide is uniformly arranged on the three-dimensional nickel foam, thereby sufficiently increasingspecific surface area of the composite material. Furthermore the prepared composite material does not require a binder in electrochemical testing, thereby realizing simple and convenient operation. The material can be used as an ideal supercapacitor, a high-performance electrocatalysis material and an electrode material of new energy devices such as a lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of material chemistry, relates to a flexible electrode material without binder, and further relates to a method for in-situ growth of a cobalt-manganese double metal hydroxide composite material with nickel foam as a substrate. Background technique [0002] Since the first industrial revolution, the population has continued to grow, the degree of modernization and innovation in the world has continued to improve and innovate, and the demand for energy has also increased. However, the traditional petrochemical energy is constantly depleted. Coupled with decades of consumption of a large amount of fossil energy has brought a huge impact on the earth. For example, greenhouse gases lead to global warming and a series of environmental problems caused by it, a lot of problems caused by the change of geological environment caused by massive energy extraction, and dust produced by burning fossil energy leads to air...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24H01G11/30H01G11/86H01M4/1391H01M4/04H01M4/505H01M4/525H01M4/88H01M4/90
CPCH01G11/24H01G11/30H01G11/86H01M4/049H01M4/1391H01M4/505H01M4/525H01M4/885H01M4/9016Y02E60/10Y02E60/13Y02E60/50
Inventor 韩生姚璐林静静颜松刘玥冉连俊常伟薛原蔺华林黄燕山卢德力
Owner SHANGHAI INST OF TECH
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