Flower-like manganese dioxide electrode material for super-capacitor and preparation method thereof

The invention relates to a flower-like manganese dioxide electrode material for a super-capacitor and a preparation method thereof, and is characterized in that the preparation method comprises the following steps: respectively dissolving potassium permanganate and a manganous salt in deionized water; carrying out stirring for 10 to 30 min under the condition of strong stirring, adding a manganous salt solution into a potassium permanganate solution, wherein the molar ratio of the manganous salt to potassium permanganate is 1: 0.1-10, and transferring a mixed solution to a hydrothermal reaction kettle for a hydrothermal reaction so as to obtain a brownish black precipitate, with a filling rate being 50 to 95%, hydrothermal reaction temperature being 100 to 160 DEG C and hydrothermal reaction time being 2 to 3 hours; and carrying out rinsing with deionized water until a filtrate is colorless and drying a filter cake at a temperature of 40 to 160 DEG C for 1 to 48 hours so as to finally obtain flower-like manganese dioxide. According to the invention, flower-like manganese dioxide with a controllable crystal form and a controllable particle size is rapidly prepared by adopting a hydrothermal method; prepared manganese dioxide has a flower-like structure and a large specific surface area, and the utilization rate of manganese dioxide in a super-capacitor is increased.