Preparation method of ultracapacitor material with layered double hydroxide-poly(3, 4-ethylenedioxythiophene) core-shell structure

Abstract

The invention discloses an ultracapacitor material with a layered double hydroxide-poly(3, 4-ethylenedioxythiophene) core-shell structure and a preparation method of the ultracapacitor material, belonging to the technical field of preparation of ultracapacitor materials. The ultracapacitor material is prepared from layered double hydroxide with electrochemical activity and poly(3,4-ethylenedioxythiophene) with good electrical conductivity. The preparation method comprises the following steps: firstly preparing a layered double hydroxide array film, and then coating a layer of poly(3,4-ethylenedioxythiophene) on a layered double hydroxide nanocrystalline array with an electrochemical deposition method, so as to form the core-shell structure. The ultracapacitor material has the advantages that layered double hydroxide nanocrystalline with an array structure can effectively suppress aggregation of active components, provides a channel for electron transfer, and ensures effective transfer of electrons during quick charging and discharging; and the introduction of a poly(3,4-ethylenedioxythiophene) shell improves the defect that the magnification performance of conventional pseudocapacitor materials is poor.

Description

technical field [0001] The invention belongs to the technical field of supercapacitor material preparation, in particular to a method for preparing a hydrotalcite-poly(3,4-ethylenedioxythiophene) core-shell structure supercapacitor material. Background technique [0002] Supercapacitors, also known as electrochemical capacitors, have the advantages of high capacity, safety and reliability, and fast charging and discharging. They are new energy storage components that have emerged with the development of material science in the past ten years. In January 2007, the world-renowned scientific and technological journal American "Discovery" listed supercapacitors as one of the world's seven major technological discoveries in 2006, and believed that supercapacitors are a revolutionary development in the field of energy storage. After entering the 21st century, electricity is in short supply, energy sources such as coal and oil are becoming increasingly exhausted, and environmental ...

AI Technical Summary

Problems solved by technology

Among common pseudocapacitive materials, RuO 2 ·xH 2 O has very superior performance. However, due to its high price, it is difficult to commercialize this type of capacitor, and it is currently only used in aerospace and military equipment.

Relatively inexpensive other transition metal oxides / hydroxides (such as MnO 2 、NiO / Ni(OH) 2 、Co 3 o 4 / Co(OH) 2 etc.) have received more and more attention in recent years, but this type of material has common disadvantages: 1) The active material is easy to agglomerate on the electrode surface, and the atoms inside the block cannot fully undergo oxidation-reduction reactions, resulting in active components The utilization rate is low, and the specific capacitance and energy density are lower than the theoretical value; 2) The conductivity of the active component is poor, and electrons cannot be effectively transferred during the rapid charge and discharge process, resulting in poor rate characteristics of the material

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