Preparation method for element-doping manganese bioxide electrode material for super capacitor

Abstract

The invention relates to a preparation method of an element doped manganese dioxide electrode material for a supercapacitor; the preparation method is characterized in that the high-energy ball milling method is adopted to mix any one of Al, Ti, Ni and Fe with manganese atoms in manganese dioxide according to the ratio of 0.05: 0.95 and then the mixture is placed in a high-energy ball milling tank, a ball milling medium is selected from agate balls with the different diameters, ratio of grinding media to material is 20:1, ethanol is added for preventing the agglomeration, the ball milling speed is 250 turns/minute, the ball milling time is controlled to be 15 hours; products are taken out after the ball milling tank is cooled to the room temperature, the drying at the constant temperature of 80 DEG C is carried out in a drying box for 48 hours; the powder after the drying is ground in an agate mortar to obtain the element doped manganese dioxide supercapacitor electrode material prepared by ball milling. The preparation method has low cost and simple preparation technology, the obtained element doped manganese dioxide electrode material has uniform distribution, high specific capacitance and good cycle stability; the preparation method can be applied in occasions which need power supply with neutral electrolyte, high stability and high power density.

Description

technical field [0001] The invention relates to a preparation method of an Al, Ti, Ni, Fe element doped manganese dioxide electrode material which can be applied in occasions requiring a neutral electrolyte, high stability, and high power density supercapacitor power supply. Background technique [0002] With its fast charge and discharge, long cycle life, reversibility and good stability, supercapacitors have shown good application and development prospects in the fields of combined power supplies for electric vehicles, repetitive large pulse power supplies, and computer backup power supplies. Carbon materials with high specific surface area are ideal electrode materials for supercapacitors, such as activated carbon, carbon aerogel, carbon nanotubes, and carbon fibers [A.G.Pandolfo et.al, J.Power Sources 157(2006)11-27.]. Although carbon supercapacitors have been initially commercialized, their application is limited due to their small specific capacity. It is necessary to ...

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Problems solved by technology

[0004] The invention discloses a method for preparing an element-doped manganese dioxide electrode material for a supercapacitor, which aims to overcome the high price of quasicapacitors that use carbon material supercapacitors with a small specific capacity and use noble metal oxides as electrode materials in the prior art And toxic, simply use MnO 2 The conductivity is weak, and the method of element doping modification is relatively cumbersome and complicated, and the requirements for experimental conditions are relatively high; the present invention uses high-energy ball milling to combine any element in Al, Ti, Ni, and Fe with manganese dioxide The preparation of element-doped manganese dioxide electrode materials not only has high specific capacitance and good cycle stability, but also has low cost, simple preparation process, and does not require complicated equipment

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