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Sodium storage serving high area-capacity for direct growth of three-dimensional nanoarray electrodes

A three-dimensional nano-array technology, which is applied in battery electrodes, nanotechnology, nanotechnology, etc., can solve the problems of low electrode material load, tap density reduces the overall tap density of the electrode, and difficulty in charge transfer, and achieves low cost and high-quality equipment. and the effect of simple production process and easy control of preparation conditions

Inactive Publication Date: 2018-03-09
NORTHEAST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the low tap density of carbon materials reduces the overall tap density of the electrode, resulting in low electrode material loading
In addition, the thicker the coated electrode film, the more difficult the charge transfer

Method used

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  • Sodium storage serving high area-capacity for direct growth of three-dimensional nanoarray electrodes
  • Sodium storage serving high area-capacity for direct growth of three-dimensional nanoarray electrodes
  • Sodium storage serving high area-capacity for direct growth of three-dimensional nanoarray electrodes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The nickel foam current collector was cut into discs with a diameter of 12mm, then cleaned with hydrochloric acid, ethanol and water, and dried in vacuum for later use. Take the current collector out of the oven, weigh the mass, and take a piece with the same mass for subsequent reactions. Add 20mg of CTAB surfactant to 15mL of hydrazine hydrate solvent and stir, then add 17.6mg of Se powder, continue stirring and dissolving for about 5h, transfer the solution to a 50mL reactor, and then put the current collector sheet of the same quality into the solution. Heat the reaction at 150°C for 12 hours. After the reaction is over, take out the current collector sheet, wash it with water and ethanol, and dry it in vacuum to obtain the initial electrode sheet. Finally, put the electrode sheet into a tube furnace at 600°C under the protection of an inert atmosphere. After high temperature treatment for 2 hours, the electrode structure was further optimized to obtain the final ne...

Embodiment 2

[0033]The nickel foam current collector was cut into discs with a diameter of 12mm, then cleaned with hydrochloric acid, ethanol and water, and dried in vacuum for later use. Take the current collector out of the oven, weigh the mass, and take a piece with the same mass for subsequent reactions. Add 20mg of CTAB surfactant to 15mL of mixed solvent of hydrazine hydrate and ethanol and stir, then add 17.6mg of Se powder, continue to stir and dissolve for about 5h, transfer the solution to a 50mL reaction kettle, and then put the current collector sheet of the same quality into In the solution, heat the reaction at 150°C for 12 hours. After the reaction, the current collector sheet is taken out, washed with water and ethanol, and dried in vacuum to obtain the initial electrode sheet. Finally, the electrode sheet is placed in a tube furnace and placed in an inert atmosphere Under protection, high temperature treatment at 600°C for 2 hours was carried out to further optimize the el...

Embodiment 3

[0035] The nickel foam current collector was cut into discs with a diameter of 12mm, then cleaned with hydrochloric acid, ethanol and water, and dried in vacuum for later use. Take the current collector out of the oven, weigh the mass, and take a piece with the same mass for subsequent reactions. Add 20mg of CTAB surfactant to 15mL of hydrazine hydrate solvent and stir, then add 17.6mg of Se powder, continue stirring and dissolving for about 5h, transfer the solution to a 50mL reactor, and then put the current collector sheet of the same quality into the solution. Heat the reaction at 150°C for 12 hours. After the reaction is over, take out the current collector sheet, wash it with water and ethanol, and dry it in vacuum to obtain the initial electrode sheet. Finally, put the electrode sheet into a tube furnace at 500°C under the protection of an inert atmosphere. After high temperature treatment for 2 hours, the final negative electrode of sodium ion battery was obtained. Wh...

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Abstract

The invention belongs to the technical field of materials of new energy resources, and particularly relates to a method for obtaining of three-dimensional nanoarray metal selenide electrodes by the simple direct growth process. By the direct growth process, the percentage of active material of the electrodes reaches 100%, and load of the active material can be regulated by regulating quantity of precursors simply. Electrochemical reaction and rapid charge transfer are guaranteed fully under high load of the active material of the electrodes by the graded three-dimensional nanoarray structure.The electrodes, especially when applied to sodium-ion batteries, have excellent area-capacity. After 100 cycles of the batteries on the condition of ampere density of 0.2mA cm<-2>, the batteries stillhave the capacity of 2.33mA h cm<-2>, and the capacity retention ratio reaches up 95%. On the condition of the high ampere density of 4.0mA cm<-2>, the batteries still have the capacity of 1.36mA h cm<-2>. With the high area-capacity and the simple preparation process, the three-dimensional nanoarray metal selenide electrodes obtained by the simple direct growth process have high potential in practical application of the sodium-ion batteries.

Description

technical field [0001] The invention belongs to the technical field of new energy materials, and particularly relates to a method for obtaining a three-dimensional nano-array metal selenide electrode by a simple direct growth method, and the obtained electrode ensures fast charge transfer of a sodium ion battery under high active material loading, The areal capacity of the electrode is greatly improved, which has important practical applications in the field of energy storage of sodium-ion batteries. Background technique [0002] High areal capacity is a very important parameter for energy storage devices with strict space constraints, such as electronic devices, electric vehicles and hybrid electric vehicles. The key point to achieve high areal capacity is to find electrode materials with high specific capacity under high electrode loading conditions. Recently, Na-ion batteries have attracted more and more attention due to the abundance and low cost of Na in nature. Howev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1397H01M4/58H01M10/054B82Y30/00
CPCB82Y30/00H01M4/1397H01M4/581H01M10/054Y02E60/10
Inventor 张景萍范朝英吴兴隆
Owner NORTHEAST NORMAL UNIVERSITY
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