A kind of high-capacity cobalt ion intercalation porous manganese dioxide electrode material and preparation method thereof

A technology of manganese dioxide electrode and manganese dioxide, which is applied in the manufacture of hybrid capacitor electrodes and hybrid/electric double-layer capacitors, can solve problems such as insignificant effects, unsatisfactory electrochemical properties, and large interface resistance, and achieve production costs The effect of low temperature, short time and mild reaction conditions

Active Publication Date: 2019-07-02
BAOJI UNIV OF ARTS & SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Researchers inserted carbon materials, metal ions, etc. between manganese dioxide nanosheets to form manganese dioxide hybrid materials to reduce agglomeration, but due to the large interface resistance of the materials formed by electrostatic assembly, the electrochemical properties are not good. ideal
In recent years, researchers have devoted themselves to the preparation of three-dimensional self-assembled materials to reduce the agglomeration of manganese dioxide materials, so that they can fully participate in electrochemical reactions and improve their electrochemical properties, but the effect is not obvious
[0008] The inventor searched the existing published literature and found that there are basically no reports on the preparation of porous manganese dioxide nanosheets. Therefore, it is of great significance to develop new technologies for the preparation of high-capacity porous manganese dioxide nanomaterials

Method used

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  • A kind of high-capacity cobalt ion intercalation porous manganese dioxide electrode material and preparation method thereof
  • A kind of high-capacity cobalt ion intercalation porous manganese dioxide electrode material and preparation method thereof
  • A kind of high-capacity cobalt ion intercalation porous manganese dioxide electrode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Add 100mL 0.2mol / L hexaamminecobalt trichloride solution into 3.48mL 5mg / mL manganese dioxide nanosheet dispersion, and stir at room temperature for 6h to obtain hexaamminecobalt ion-intercalated manganese dioxide nanomaterials, Wash, redisperse. Heat the obtained dispersion to 100°C, adjust the pH of the reaction system to 1 with hydrochloric acid, heat to reflux for 2 hours under this condition, cool naturally to room temperature, filter under reduced pressure, wash with deionized water until the filtrate is neutral, freeze-dry, Porous manganese dioxide nanomaterials prepared as cobalt ion intercalation.

[0036]The obtained product is characterized and tested by X-ray diffractometer, transmission electron microscope and electrochemical workstation, the results are shown in Figure 1~3 . Depend on figure 1 It can be seen from the X-ray diffraction pattern that the resulting product is layered manganese dioxide. From figure 2 It can be seen that the manganese di...

Embodiment 2

[0039] Add 100mL 0.04mol / L cobalt hexammine trichloride solution to the manganese dioxide nanosheet dispersion, and other steps are the same as in Example 1, and the porous manganese dioxide nanomaterial that obtains cobalt ion intercalation is prepared as Figure 5 As shown, tested at a current density of 0.25A·g -1 , its mass specific capacity is 368F·g -1 .

Embodiment 3

[0041] Add 100mL 0.1mol / L cobalt hexammine trichloride solution to the manganese dioxide nanosheet dispersion, and other steps are the same as in Example 1, and prepare the porous manganese dioxide nanomaterials intercalated with cobalt ions such as Figure 6 As shown, tested at a current density of 0.25A·g -1 , its mass specific capacity is 418F·g -1 .

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Abstract

The invention discloses a high-capacity cobalt ion intercalated porous manganese oxide electrode material and a preparation method thereof. According to the method, a two-dimensional layered manganeseoxide nanosheet and hexamminecobalt chloride are mixed before being subjected to heating and refluxing under acidic conditions with a pH of 1 to 4 to obtain cobalt intercalated porous manganese oxidenanomaterial. According to the method, hexamine cobalt intercalation ions lose part of the ammonia molecule ligands to form a strong oxidant, and part of a manganese oxide main plate is oxidized in situ into soluble permanganate ions under acidic conditions to form a pore structure; cobalt ions are obtained via self reduction, and a cobalt ion intercalated porous manganese oxide nanometer material is obtained; via the method, density of pores on the nanometer manganese oxide sheet can be adjusted, and electrolyte ion transmission performance can be improved; the obtained material has a specific capacitance as high as 322-456 F*g-1 and can be used as an electrode material for assembling high energy density supercapacitors; this method is mild in reaction conditions, short in time, high inavailability of raw materials, strong in operability, and low in preparation cost.

Description

technical field [0001] The invention belongs to the technical field of electrode material preparation, and in particular relates to a high-capacity cobalt ion intercalation porous manganese dioxide electrode material and a preparation method thereof. Background technique [0002] Due to its unique physical and chemical properties, manganese dioxide has broad application prospects in many fields such as catalysis, ion exchange, lithium-ion batteries and supercapacitors. There are various kinds of manganese dioxide minerals. According to the different connection modes of the basic assembly unit [MnO6] octahedron, manganese dioxide can be divided into tunnel manganese dioxide, layered manganese dioxide and network manganese dioxide. The layered manganese dioxide is composed of the main body of positively charged laminates and interlayer cations with ion exchange, and the interlayer distance is determined by the type of interlayer cations and water content. Layered manganese di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/46H01G11/86
CPCY02E60/13
Inventor 张改妮任莉君胡登卫侯少龙
Owner BAOJI UNIV OF ARTS & SCI
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