Preparation method of element doping manganese dioxide electrode material for super capacitor

A manganese dioxide electrode and supercapacitor technology, which is applied in the direction of capacitors, electrolytic capacitors, electrical components, etc., can solve the problems of high control conditions, cumbersome and complicated methods, and small specific capacitance, and achieve mature and reliable technical routes, mature processes, Avoid the effects of difficult doping control

Active Publication Date: 2010-05-05
SUZHOU YOURBEST NEW TYPE MATERIALS
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a method for preparing an element-doped manganese dioxide electrode material for supercapacitors, which solves the problem of using carbon materials as electrode materials for supercapacitors in the prior art with small specific capacitance, using noble metal oxides as electrode materials for supercapacitors, which is expensive and expensive. Toxic and pure MnO 2 The electronic conductivity is weak, and the existing methods for element doping and modification of manganese dioxide are cumbersome and complicated, and the control conditions are high.

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  • Preparation method of element doping manganese dioxide electrode material for super capacitor
  • Preparation method of element doping manganese dioxide electrode material for super capacitor
  • Preparation method of element doping manganese dioxide electrode material for super capacitor

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Embodiment 1

[0034] Embodiment 1: Preparation of Ni element doped manganese dioxide electrode material

[0035] Electrolytic manganese dioxide powder with a particle size of about 20 microns and Ni(OH) 2 Stir and grind at the ratio of Ni / Mn molar ratio 0.2 and Li / Mn molar ratio 0.5 to carry out thorough mixing, and use a temperature-programmed muffle furnace to calcinate the mixture at 850-970°C for 48 hours and cool to obtain a spinel structure of LiNi x mn 2-x o 4 Powder material. The prepared spinel LiNi x mn 2-x o 4 Suspend the powder in pure water, slowly add sulfuric acid solution under stirring conditions, control the temperature not higher than 50°C, until the pH of the slurry reaches 0.5-2, continue stirring for 1 hour, centrifuge the reacted slurry, and pour off the supernatant , filtered with suction and repeatedly washed with water until the eluate is neutral, and the filtrate is vacuum-dried at a temperature not higher than 90°C to obtain nickel-doped MnO2 powder.

[0...

Embodiment 2

[0037] Preparation of Example 2Ti element doped manganese dioxide electrode material

[0038] As described in Example 1, with 1250 orders below the anatase type TiO powder is prepared to obtain titanium-doped manganese oxide electrode material;

[0039] The prepared Ti-doped manganese dioxide electrode material was used as the positive electrode, the graphite electrode was used as the negative electrode, the Ag / AgCl electrode was used as the reference electrode, and 1MNa2SO4 was used as the electrolyte to form a three-electrode test system to test the electrochemical performance of the material. Cyclic voltammetry scanning speed 10mv / s, scanning interval 0.0-1.0V; constant current charge and discharge current 200mA / g, voltage interval 0-1.0v. The Ti-doped manganese dioxide electrode has a specific capacitance of 163f / g after 500 cycles.

Embodiment 3

[0040] The preparation of embodiment 3Co element doping manganese dioxide electrode material

[0041] As described in Example 1, cobalt-doped manganese oxide electrode material is prepared with Co2O3 powder below 1250 orders;

[0042] The prepared Co-doped manganese dioxide electrode material was used as the positive electrode, the graphite electrode was used as the negative electrode, the Ag / AgCl electrode was used as the reference electrode, and 1MNa2SO4 was used as the electrolyte to form a three-electrode test system to test the electrochemical performance of the material. Cyclic voltammetry scanning speed 10mv / s, scanning interval 0.0-1.0V; constant current charge and discharge current 200mA / g, voltage interval 0-1.0v. Co-doped manganese dioxide electrode has a specific capacitance of 178f / g after 500 cycles.

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Abstract

The invention discloses a preparation method of an element doping manganese dioxide electrode material for a super capacitor, which is characterized by comprising the following steps: (1) synthesizing a LiAxMn2-xO4 powder material with a spinel structure by utilizing a suitable method, wherein A is selected from metallic addictive elements Ti, Ni, Sn, Co, Zn and Al, and x is within the range of 0.01-0.25%; and (2) utilizing lithium ion removal agent to remove lithium ions from the LiAxMn2-xO4 powder material obtained from step (1) under the condition of not destructing the spinel structure of a precursor, thereby obtaining the element-replacement MnO2-doping electrode material for the super capacitor. For the element doping manganese dioxide electrode material prepared by the invention, the Mn part in a lattice can be evenly replaced by doped elements, and the method has high industrial maturity and is a way with great potential for preparing the manganese dioxide electrode material for the super capacitor.

Description

technical field [0001] The invention belongs to the technical field of preparation of supercapacitor electrode materials, and in particular relates to a preparation method for replacing doped manganese dioxide with elements for supercapacitors. Background technique [0002] Supercapacitor is a new type of energy storage element between traditional capacitors and batteries. It has both the advantages of high power density of conventional capacitors and high energy density of rechargeable batteries. It can release large currents instantly, charge and discharge quickly, and has high charging efficiency, long cycle life, no memory effect, basically no maintenance during use, and environmental protection. Pollution-free, it has extremely important and broad application prospects in mobile communications, information technology, industrial fields, consumer electronics, electric vehicles, aerospace and defense technology, etc. [0003] At present, the electrode materials used for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/042
CPCY02E60/13
Inventor 金成昌孟波
Owner SUZHOU YOURBEST NEW TYPE MATERIALS
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