Preparation of Al-doped manganese-oxygen composite material and testing method for its electrochemical performance

Abstract

The invention belongs to the technical field of composite material preparation, and discloses a preparation method of an Al-doped manganese oxide composite material and a test method for its electrochemical performance; KOH and NaOH are dissolved in deionized water to form solution A; 0.5mol / L Al(CH 3 COO) 3 The solution was poured into 1.0mol / L Mn(CH 3 COO) 2 The solution was formulated into solution B; solution A was added dropwise to solution B; the mixed solution was transferred to an autoclave, reacted at 180°C for 24 hours, and the product was naturally cooled to room temperature, and the product was centrifuged; the separated substance Dry in a tube furnace, calcinate at 500°C for 5h in an air atmosphere, and cool naturally. In the present invention, by characterizing the structure and appearance of the material, and testing the electrochemical performance of the material, it can be known that the composite material has good stability, good rate performance and cycle performance.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation, and in particular relates to a method for preparing an Al-doped manganese-oxygen composite material and testing its electrochemical performance. Background technique [0002] At present, the commonly used prior art in the industry is as follows: transition metal oxides are often used as electrode active materials for supercapacitors due to their unique electrochemical properties. Manganese oxides (Mn x o y ) have been extensively studied due to their low cost, variable oxidation valence state, excellent cycling performance, and high capacitance. There are many oxide forms of Mn, such as: MnO 2 , Mn 2 o 3 , Mn 3 o 4 etc., where MnO 2 most applications. MnO can be prepared by co-precipitation 2 Nanoparticles, Mn can be prepared by hydrothermal method 2 o 3 nanoparticles, and some studies have shown that in Mn 2 o 3 Doping carbon material in the material can impr...

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Problems solved by technology

[0004] (1) The common hydrothermal method for preparing manganese oxide requires relatively high temperatures, and the reaction time period is relatively long. This is because in order to obtain a material with a complete crystal structure, the growth rate of the crystal needs to be controlled. At the same time, In the hydrothermal process, high temperature is often used to obtain greater pressure to synthesize materials, but this will also cause safety hazards to equipment, and longer reaction cycles will result in greater energy loss

[0005] (2) Manganese oxide materials prepared by the hydrothermal method tend to have a single composition, so the specific capacitance is not very high

This method needs to be calcined twice, and the time period is also longer

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