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use cnts@sio 2 @ni/al‑ldh Supercapacitor with core-shell structure as cathode material

A technology for supercapacitors and positive electrode materials, applied in nanotechnology for materials and surface science, hybrid capacitor electrodes, nanotechnology, etc., can solve problems such as complex processes and large-scale production difficulties, and achieve improved cycle performance and use Long life and increased cycle charge and discharge life

Active Publication Date: 2017-06-30
四川英能基科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A relatively high specific surface area has been obtained. However, in this preparation method, the process is complicated. Carbon tubes are prepared on nickel foam by cracking acetylene gas at high temperature. Difficult to produce
On the other hand, the above invention does not mention how much energy density can be obtained, and energy density is one of the most important indicators for supercapacitors as energy storage applications

Method used

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  • use cnts@sio <sub>2</sub> @ni/al‑ldh Supercapacitor with core-shell structure as cathode material
  • use cnts@sio <sub>2</sub> @ni/al‑ldh Supercapacitor with core-shell structure as cathode material
  • use cnts@sio <sub>2</sub> @ni/al‑ldh Supercapacitor with core-shell structure as cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Carbon nanotubes@silica@nickel-aluminum-nickel-aluminum hydrotalcite (CNTs@SiO 2 @Ni / Al-LDH) core-shell structure positive electrode material preparation, the preparation process is as follows:

[0041] 1) Weigh carbon nanotubes and CTAB powder in a container, then add ethanol and deionized water to the above container, wherein the mass ratio of carbon nanotubes and CTAB is 1:1 to 1:100, and the above mixed solution is ultrasonically Process to obtain carbon nanotube solution A;

[0042] 2) Take solution A and add NaOH, tetraethyl orthosilicate (TEOS), wherein, the concentration of NaOH is controlled at 0.01-5000mmol / L, and the concentration of tetraethyl orthosilicate is controlled at 0.001-5000Mmol / L. After stirring evenly at room temperature, After centrifugation, the product was washed with ethanol and dried to obtain a clean powder B.

[0043] 3) Disperse aluminum isopropoxide in deionized water with a mass ratio of (1-100):100, stir evenly at 10-100°C, then add ...

Embodiment 2

[0055] The assembled device structure is as Figure 4 As shown, the assembly of the cathode material and the cathode current collector is to prepare CNTs@SiO 2 The three-dimensional nanomaterials of @Ni / Al-LDH core-shell structure, graphene nanometers and binder are mixed at a mass ratio of 75:20:5 and coated on the nickel foil current collector with a coating thickness of 20 μm. The assembly of the negative electrode material and the negative electrode current collector is to coat the activated carbon material on the nickel foil current collector with a coating thickness of 20 μm. The assembled positive electrode and negative electrode are separated by an electrode separator, placed in KOH electrolyte for soaking, and finally assembled into a battery.

[0056] The preparation process is similar to Example 1.

Embodiment 3

[0058] The assembled device structure is as Figure 4 As shown, the assembly of the cathode material and the cathode current collector is to prepare CNTs@SiO 2 @Ni / Al-LDH core-shell structure three-dimensional nanomaterials, carbon nanotubes and binder are mixed at a mass ratio of 85:10:5 and coated on a stainless steel foil current collector with a coating thickness of 30 μm. The assembly of the negative electrode material and the negative electrode current collector is to coat the activated carbon material on the nickel foil current collector with a coating thickness of 30 μm. The assembled positive electrode and negative electrode are separated by an electrode separator, placed in KOH electrolyte for soaking, and finally assembled into a battery.

[0059] The preparation process is similar to Example 1.

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Abstract

The invention discloses a super capacitor using a CNTs@SiO2@Ni / Al-LDH core shell structure as an anode material. The super capacitor comprises an anode current collector, the anode material, a battery diaphragm, an electrolyte, a cathode material and a cathode current collector. The anode material is composite material of a 3D nanometer structure by taking carbon nanotube of high conductivity as the core, nickel / aluminum hydrotalcite as the shell and silica as a connection layer; the specific surface area is large, and the electrochemical activity is high. The charging / discharging time of the super capacitor is extremely short, the power density and energy density of the super capacitor is extremely high, the service life is long, and the energy density can reach 100Wh / kg.

Description

technical field [0001] The invention belongs to the field of energy storage, and relates to an asymmetric supercapacitor using a three-dimensional nanostructure material with a carbon nanotube silicon dioxide nickel aluminum hydrotalcite core-shell structure as the positive electrode. Background technique [0002] Generally, supercapacitors are divided into two types according to the difference in energy storage mechanism: one is called electric double layer capacitor, or EDLC for short, and the electric double layer capacitor is formed by the directional arrangement of electrons or ions at the electrode / electrolyte interface Caused by the confrontation of charges. For an electrode / electrolyte system, an electric double layer will form at the interface between the electron-conducting electrode and the ion-conducting electrolyte. The other type is Faraday capacitor (FS), also known as quasi-capacitor, also called pseudocapacitor. The charge storage mechanism of Faraday capac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/36H01G11/30B82Y30/00B82Y40/00
CPCY02E60/13
Inventor 陈泽祥王艳李海张继君
Owner 四川英能基科技有限公司