Preparation and electrochemical performance test method of Na2Mn8O16/Mn2O3 composite material

Abstract

The invention discloses preparation and an electrochemical performance test method of a Na2Mn8O16 / Mn2O3 composite material, and belongs to the technical field of composite material preparation. KOH and NaOH are dissolved by deionized water to prepare a solution A; a 0.5mol / L CH3COONa solution is poured into a 1.0mol / L Mn(CH3COO)2 solution to prepare a solution B; the solution A is added into the solution B dropwise; after dropping, the mixed solution is transferred into a high pressure autoclave, makes reaction for 24h at 180 DEG C, and cooled naturally to the room temperature, and then centrifugation is carried out on a product; and substances after after-separating centrifugation are placed in a tubular furnace, dried, burned for 5h at 500 DEG C in the atmosphere, and cooled naturally. The structure and morphology of the material are represented, the electrochemical performance of the material is tested, and it can be known that the composite material has high stability, power multiplication and circulation performances.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation, in particular to a Na 2 mn 8 o 16 / Mn 2 o 3 Preparation of composite materials and testing methods for their electrochemical properties. Background technique [0002] At present, the existing technologies commonly used in the industry are as follows: [0003] Transition metal oxides are often used as electrode active materials for supercapacitors due to their unique electrochemical properties. Manganese oxides in transition metal 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 ...

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Problems solved by technology

[0006] (1) Na in the prior art 2 mn 8 o 16 The synthesis temperature of the material is relatively high, and the reaction time period is too long, wasting a lot of electric energy and time

[0007] (2) Na in the prior art 2 mn 8 o 16 The synthesis steps of the material are cumbersome, the pretreatment process takes a long time, and the method used is to evaporate the solution at a temperature of 70 ° C. This method wastes time and energy and cannot be produced on a large scale

[0008] (3) Na in the prior art 2 mn 8 o 16 Materials were synthesized using MnO 2 As a raw material, since MnO 2 It is insoluble in water, so the prepared solution has poor dispersibility and cannot disperse ions evenly on the atomic scale. 2 mn 8 o 16 The synthesis of materials has a large impact on

[0009] (4) Prior art Na 2 mn 8 o 16 The composition of the product obtained from the synthesis of the material is single. At the same time, due to the high temperature calcination, the particles of the obtained material are relatively coarse and the specific capacitance is not high.

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