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Preparation method of high-voltage sodium ion supercapacitor

A supercapacitor and sodium ion technology, which is applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, hybrid capacitor electrolytes, etc., can solve the problems of reducing the specific capacity and cycle life of sodium ion batteries, and structural collapse, and achieve environmental friendliness , Strong contact and strong operability

Inactive Publication Date: 2018-05-04
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] As a new generation of energy storage devices, sodium-ion batteries have attracted more and more attention. However, Na + The large radius (1.06 Å) leads to severe structural collapse during charge and discharge, which greatly reduces the specific capacity and cycle life of Na-ion batteries.

Method used

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  • Preparation method of high-voltage sodium ion supercapacitor
  • Preparation method of high-voltage sodium ion supercapacitor
  • Preparation method of high-voltage sodium ion supercapacitor

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Experimental program
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Effect test

Embodiment 1

[0020] First place the Ti sheet in 1 M NaOH solution at an angle of 60 degrees and place it in an oven at 180 o C for 12 h. Then the film obtained after the hydrothermal reaction was placed in a tube furnace for 5 o Cmin -1 Speed ​​up to 400 o After keeping at C for 1 h and cooling naturally to obtain Na 2 Ti 3 o 7 Nanosheet arrays. figure 1 For the prepared Na 2 Ti 3 o 7 XRD patterns and corresponding SEM images of the arrays. It can be seen from the XRD pattern that Na 2 Ti 3 o 7 The characteristic peak, its XRD pattern and Na 2 Ti 3 o 7 (JCPDS No.31-1329) card is consistent. Through the corresponding SEM image we can see that Na 2 Ti 3 o 7 The nanosheet arrays are orderly distributed on the titanium substrate with a size of 1-2 µm. figure 2 for the corresponding Na 2 Ti 3 o 7 TEM images of nanosheets, which can determine individual Na 2 Ti 3 o 7 Nanosheets have a distinct porous structure. pass figure 2 The high-resolution TEM test in b can see...

Embodiment 2

[0022] First place the Ti sheet in 1 M NaOH solution at an angle of 60 degrees and place it in an oven at 180 o C for 12 h. Then the film obtained after the hydrothermal reaction was placed in a tube furnace for 5 o Cmin -1 Speed ​​up to 400 o After keeping at C for 1 h and cooling naturally to obtain Na 2 Ti 3 o 7 Nanosheet array, active material Na 2 Ti 3 o 7 Mass is 1 mg cm -1 . Directly use 5 g potassium citrate as carbon source, place it in a nitrogen atmosphere to o Cmin -1 Speed ​​up to 800 o C and kept for 3 h, filtered and dried to obtain carbon nanosheet powder after washing with 0.3 M dilute hydrochloric acid. We use carbon nanosheets and Na 2 Ti 3 o 7 The nanosheet array is used as the positive electrode and negative electrode material of the sodium ion supercapacitor respectively, and the mass ratio of the active material of the positive and negative electrode materials is 4:1. The prepared hybrid supercapacitor is at 825 W kg -1 The energy densi...

Embodiment 3

[0024] First place the Ti sheet in 1 M NaOH solution at an angle of 60 degrees and place it in an oven at 180 o C for 12 h. Then the film obtained after the hydrothermal reaction was placed in a tube furnace for 5 o Cmin -1 Speed ​​up to 400 o After keeping at C for 1 h and cooling naturally to obtain Na 2 Ti 3 o 7 Nanosheet arrays. Directly use 5 g potassium citrate as carbon source, place it in a nitrogen atmosphere to o Cmin -1 Speed ​​up to 800 o C and kept for 3 h, filtered and dried to obtain carbon nanosheet powder after washing with 0.3 M dilute hydrochloric acid. We use carbon nanosheets and Na 2 Ti 3 o 7 The nanosheet array is used as the positive electrode and negative electrode material of the sodium ion supercapacitor respectively, and the mass ratio of the active material of the positive and negative electrode materials is 4.5:1. The prepared hybrid supercapacitor at 825 Wkg -1 The energy density under the power density is 72.6 Wh kg -1 . at 2 A g...

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Abstract

The invention discloses a method for assembling a high-voltage sodium ion supercapacitor. The method comprises the steps of putting a titanium sheet of 3*5cm<2> into a NaOH solution of a certain concentration to prepare and obtain a layered and multi-stage Na<2>Ti<3>O<7> nanosheet array in a hydrothermal manner, and taking the Na<2>Ti<3>O<7> array as the negative electrode of the sodium ion supercapacitor; by taking potassium citrate as a carbon source, performing high-temperature annealing in a N<2> atmosphere to obtain a carbon nanosheet, and taking the carbon nanosheet as the positive electrode material of the sodium ion supercapacitor; and by taking the carbon nanosheet and the Na<2>Ti<3>O<7> nanosheet array as the positive and negative electrode materials respectively, obtaining the sodium ion supercapacitor through assembling. The energy density of the sodium ion supercapacitor can reach 89.6 Wh kg<-1> at the power density of 825 W kg<-1>; the energy density still can reach 73 Whkg<-1> at the high power density of 8,250 W kg<-1>; in addition, high current charging and discharging of 2 A g<-1> can be realized at the high voltage of 4V; and after 2,000 cycles, the specific capacity still can be 73.9% of the initial capacity.

Description

technical field [0001] The invention relates to the assembly of a novel sodium ion supercapacitor, in particular to the preparation and assembly of a 4 V voltage sodium ion supercapacitor, and belongs to the field of sodium ion supercapacitors. Background technique [0002] As a new generation of energy storage devices, sodium-ion batteries have attracted more and more attention. However, Na + The larger radius (1.06 Å) leads to severe structural collapse during charge and discharge, which greatly reduces the specific capacity and cycle life of Na-ion batteries. Sodium-ion supercapacitors can effectively overcome the capacity fading problem faced by sodium-ion batteries by combining sodium-ion batteries with supercapacitors. At the same time, they can ensure high energy density and power density of energy storage devices, and solve the problem of traditional water supercapacitor voltage. and low energy density. Recently, Na 2 Ti 3 o 7 As a layered anode material for sod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/46H01G11/36H01G11/60H01G11/62H01G11/84H01G11/08B82Y30/00
CPCY02E60/13H01G11/46B82Y30/00H01G11/08H01G11/36H01G11/60H01G11/62H01G11/84
Inventor 高林杨学林
Owner CHINA THREE GORGES UNIV
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