Controllable preparation method of nanometer manganese dioxide

Abstract

The invention belongs to the functional material preparation technical field and relates to a controllable preparation method of nanometer manganese dioxide. The method includes the following steps that: a surfactant is added to a KMnO4 solution of 200 mol with a concentration of 0.1 mol / L, a Mn (CH3COO)2 solution of 300 mol with a concentration of 0.2 mol / L is added dropwise to an obtained mixture within 2 hours, and a newly obtained mixture is stirred for 8 hours; a precipitated product is washed and is filtered with deionized water and ethanol; a filtered substance is dried and ground, so that a brown-black manganese dioxide active substance is obtained; the manganese dioxide active substance, conductive carbon black and a polytetrafluoroethylene (PTFE) binder are mixed, an obtained mixture is stirred with N-methyl pyrrolidone, so that the mixture can be like plasticine; and the mixture is pressed on a Ti sheet, so that a manganese dioxide electrode sheet can be obtained. The manganese dioxide prepared by using the method of the present invention is a typical amorphous alpha-MnO2; the specific capacity of the manganese dioxide is increased from 162F / g to 213F / g; and studies havealso found that small-particle size manganese dioxide with uniform particle size distribution can better serve as the electrode material of a super capacitor, and is particularly suitable for high-current charging and discharging.

Description

technical field [0001] The invention relates to the technical field of preparation of functional materials, in particular to a controllable preparation method of nanometer manganese dioxide. Background technique [0002] With the advent of the low-carbon economy, the comprehensive and efficient development and utilization of new green energy has received extensive attention from researchers. Supercapacitor is a new type of green energy. Due to its high power density, moderate energy density, fast charge and discharge rate, and long cycle life, it can be widely used in consumer electronics, military, rail transit, aerospace and other fields. The global market is worth billions of dollars. The key component of the supercapacitor is the electrode material. The performance of the electrode material determines the electrochemical behavior and performance of the energy storage device. Therefore, the research on the key electrode material has become the top priority of the capacit...

AI Technical Summary

Problems solved by technology

Among them, the liquid phase precipitation method has the characteristics of simple reaction, fast, complete and low cost, but the disadvantage is that the morphology of the reaction product cannot be controlled during the reaction process, and the obtained particle size is relatively large.