Controlled preparation method of nano-manganese oxide

Abstract

The invention relates to the technical field of preparation of functional materials, and in particular relates to a controlled preparation method of nano-manganese oxide. The method comprises the following steps: adding surfactants into 200moL of 0.1 mol / L KMnO4 solutions; dropwise adding 300moL of 0.2 mol / L Mn(CH3COO)2 solutions in 2 hours; stirring for 8 hours; washing a precipitant product by using deionized water and ethanol and filtering; drying a filter and grinding to obtain a brownish black manganese dioxide active substance; uniformly mixing a manganese dioxide active substance, conductive carbon black and a polytetrafluoroethylene (PTFE) adhesive; stirring N-methyl pyrrolidone into a plasticine shape; and pressing downwards on a Ti plate to prepare a manganese dioxide electrode plate. Manganese dioxide prepared by using the method is classic amorphous form alpha-MnO2, and manganese dioxide specific capacity is increased from 162F / g to 213F / g. The research proves that manganese dioxide with small uniformly-distributed gain sizes is more suitable for being used as an electrode material of a specific capacity, and therefore, the manganese dioxide is particularly suitable for large-current charging / 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...

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.