Preparation method for supercapacitor electrode material MnO2

Abstract

The present invention provides a preparation method for a supercapacitor electrode material MnO2. The method concretely comprises: adopting a citric acid sol-gel method to prepare a nano-MnO2 material, and studying influence on a sample due to different calcination temperatures and heat preservation times. Results of XRD analysis and SEM analysis show that: low valence manganese oxides (MnO2 and MnO2) are obtained with calcination at different temperatures (350-500 DEG C), and M'' valence oxides can be obtained with an acidification treatment; after calcination is performed for a short time, the sample has characteristics of small particle and large specific surface area, and results of cyclic voltammetry and constant current charge / discharge tests show that the sample with a 3 hour heat preservation treatment has a good capacitance characteristic. In addition, results show that the prepared MnO2 electrode material has good electrochemical performance, and is suitable for a supercapacitor electrode material. The preparation method for the supercapacitor electrode material MnO2 is characterized in that: 1, a dry gel is calcined at different temperatures to obtain low valence manganese, and then an acidification treatment is performed to obtain MnO2; 2, a calcination heat preservation time affects electrochemical properties of the sample, wherein the prepared MnO2 with a 3 hour heat preservation treatment has a good capacitance characteristic, and electrochemical performances are excellent.

Description

technical field [0001] The invention relates to an electrode material MnO 2 The preparation method, especially a kind of supercapacitor electrode material MnO 2 method of preparation. Background technique [0002] Supercapacitors, also known as ultra-large-capacity capacitors or electrochemical capacitors, are a new type of energy storage element between traditional electrostatic capacitors and batteries. The energy stored in a supercapacitor can reach more than 10 times that of an electrostatic capacitor, and at the same time it has a power density 10 to 100 times higher than that of a battery. With the characteristics of long service life and no memory effect, it has a very broad application prospect. [0003] Supercapacitors can be divided into two types according to the energy storage mechanism: one is based on the electrode, the electric double layer capacitor generated by the interface charge separation of the electrolyte, which mostly uses activated carbon with a h...

AI Technical Summary

Problems solved by technology

It mostly uses noble metal oxides such as ruthenium oxide and iridium oxide as electrode materials, and the specific capacity of Ruoz supercapacitor is as high as 760F / g31, but the price of noble metal oxides such as Ruoz and IrO2 is expensive, and it is not easy to realize commercialization

Because transition metal oxides such as nickel oxide, cobalt oxide and manganese oxide have similar properties to RuO2, they have attracted much attention from researchers. Among them, the specific capacity of nickel oxide and cobalt oxide can reach 200-300F, g. But their potential The window is relatively narrow (about 0.5V). The energy density is low