Preparation method of multi-aperture manganese dioxide

Abstract

The invention provides a preparation method of multi-aperture manganese dioxide. The preparation method comprises the following steps: S1), preparing manganese acetate gel A; S2), preparing manganeseacetate gel B; S3), preparing manganese acetate gel C; S4), sequentially applying the manganese acetate gel A, the manganese acetate gel B and the manganese acetate gel C to flake graphite, and then drying; and S5), heating to obtain multi-aperture manganese dioxide. By directly synthesizing manganese dioxide on flake graphite, the synthesis method is simple and convenient. Starch molecules with different pore sizes are used for making pores of manganese dioxide to form multi-aperture manganese dioxide. Pores are movable when a three-level pore structure is heated, the large pores in the mostsuperficial surface move downwards while the small pores in the innermost surface move upwards, and the pores become more uniform by moving and merging, thereby further increasing the conductivity ofmanganese dioxide. The synthetic method is beneficial to environment protection, and manganese acetate and starch are both simple and easily available material that can be used in large-scale industrial production.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a preparation method of porous manganese dioxide. Background technique [0002] Manganese (Mn) has a high reserve in nature, accounting for 0.13% of the total element content in the earth's crust, ranking the tenth among all elements. The outer electron configuration of manganese atom 3D 5 4s 2 , so its valence can vary from +2 to +7. The common valence states of manganese are +2, +4, +7 and so on. Manganese has the characteristics of abundant resources, low price, variable valence, low toxicity, environmental friendliness, diverse structures and wide electrochemical window, so it has great potential for development in the field of electrochemistry. [0003] Manganese dioxide (MnO 2 ) is considered to be a resource-rich, low-cost, environment-friendly, double-layer capacitance and Faraday pseudocapacitance two charge storage methods, the theoretical specific capacitance can r...

AI Technical Summary

Problems solved by technology

[0005] The traditional methods for synthesizing manganese dioxide include liquid phase reduction method, sol-gel method, hydrothermal method and template method, etc., but these methods not only have complex synthesis steps, long reaction time, and use a large amount of organic solvents, high energy consumption, The synthesized manganese dioxide is non-porous inside and has a small specific surface area, which severely restricts the free movement of electrons, and its conductivity is not strong. It needs further improvement in the manufacture of zinc-manganese batteries.

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