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Amorphous transition metal hydroxide electrode material and preparation method thereof

A technology of transition metals and hydroxides, applied in electrolytic inorganic material coatings, hybrid capacitor electrodes, etc., can solve the problem of low electrode loading, achieve high loading, good rate performance and cycle performance, good rate performance and cycle performance performance effect

Active Publication Date: 2022-02-08
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method still does not solve the problem of low loading of electrodes prepared electrochemically.

Method used

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  • Amorphous transition metal hydroxide electrode material and preparation method thereof
  • Amorphous transition metal hydroxide electrode material and preparation method thereof
  • Amorphous transition metal hydroxide electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] In 100mL deionized water, add 1.16g Ni(NO 3 ) 2 , 0.58g Co(NO 3 ) 2 , 0.3g of sodium alginate was stirred and dissolved to obtain an electrolyte, and the carbon cloth was used as a working electrode, immersed in the electrolyte, and deposited at a voltage of –1.0V for 900s. After the end, the working electrode was taken out and washed several times with deionized water to obtain the NiCo double metal hydroxide@carbon cloth electrode material with an active material loading of 3.8 mg cm -2 .

[0036] The constant current charge and discharge curves of the NiCo double metal hydroxide @ carbon cloth electrode material prepared in this example at different current densities are as follows figure 1 As shown, observing the curve, it can be found that there are obvious platforms in the charging and discharging curves of the electrode material, reflecting the energy storage mechanism of the metal hydroxide battery type capacitor, that is, Co 2+ 、Ni 2+ reversible redox rea...

Embodiment 2

[0040] In 100mL deionized water, add 2.32g Co(NO 3 ) 2 , 1.22g V(NO 3 ) 3 , 0.5g of sodium alginate was stirred and dissolved to obtain an electrolyte solution, nickel foam was used as a working electrode, immersed in the electrolyte solution, and deposited at a voltage of –1.1V for 1200s. After the end, the working electrode was taken out and washed several times with deionized water to obtain the CoV double metal hydroxide@foamed nickel electrode material with an active material loading of 5.1 mg cm -2 .

[0041] The CoV double metal hydroxide@ foamed nickel electrode material prepared in this example is at 2mA cm -2 The mass specific capacitance is as high as 2234F g -1 , the area specific capacitance is as high as 11.4F cm -2 ; when the current density increases to 50mA cm -2 , the area specific capacitance is still as high as 5.7F cm -2 (50% retention rate); after 5000 cycles of charging and discharging, the specific capacitance retention rate is 55%.

[0042] In...

Embodiment 3

[0045] In 100mL deionized water, add 1.89g Ni(Cl) 2 , 1.54g Co(Cl) 2 , 1.0g of polyethylene oxide was stirred and dissolved to obtain an electrolyte, and the carbon cloth was used as a working electrode, immersed in the electrolyte, and deposited at a voltage of –0.9V for 600s. After the end, the working electrode was taken out and washed several times with deionized water to obtain the NiCo double metal hydroxide@carbon cloth electrode material with an active material loading of 2.2 mg cm -2 .

[0046] The NiCo double metal hydroxide@carbon cloth electrode material prepared in this example is at 2mA cm -2 The mass specific capacitance is as high as 2126F g -1 , the area specific capacitance is as high as 4.7F cm -2 ; when the current density increases to 50mA cm -2 , the area specific capacitance is 1.9F cm -2 (40% retention rate); after 5000 cycles of charging and discharging, the specific capacitance retention rate is 51%.

[0047] In the NiCo double metal hydroxide@...

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Abstract

The invention discloses a preparation method of an amorphous transition metal hydroxide electrode material, which comprises the following steps: by taking a mixed solution of soluble metal salt and water-soluble polymer as an electrolyte and a porous conductive substrate as a working electrode, immersing the porous conductive substrate into the electrolyte, and performing electrochemical deposition to prepare the amorphous transition metal hydroxide electrode material. The preparation method is simple, efficient and mild in condition, and the prepared amorphous transition metal hydroxide electrode material comprises a porous conductive substrate layer and an amorphous transition metal hydroxide nanosheet network structure growing on the porous conductive substrate layer in situ. The amorphous transition metal hydroxide electrode material is high in active substance loading capacity, high in specific capacitance, good in rate capability and cycle performance and wide in application prospect in preparation of energy storage devices such as supercapacitors.

Description

technical field [0001] The invention belongs to the technical field of preparation of advanced energy storage materials, and in particular relates to an amorphous transition metal hydroxide electrode material and a preparation method thereof. Background technique [0002] The research of new, environment-friendly energy storage devices has been widely concerned. As an energy storage device, a supercapacitor has the characteristics of high power density, fast charge and discharge rate, and long service life. The current commercial supercapacitor electrode materials are mainly carbon materials. However, the energy storage mechanism of the electric double layer capacitor leads to its low specific capacitance, which limits its application. [0003] Transition metal hydroxides (TMHs) are a common class of cathode materials for hybrid supercapacitors. Energy storage is achieved through the fast and reversible redox reaction between different valence states of transition metal i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D9/04C25D7/00H01G11/30H01G11/36H01G11/34H01G11/44H01G11/24
CPCC25D9/04C25D7/00H01G11/30H01G11/36H01G11/34H01G11/44H01G11/24Y02E60/13
Inventor 杜淼胡文轩郑强
Owner ZHEJIANG UNIV
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