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Preparation method of alpha-MnO2 electrode material

An electrode material and a certain amount of technology, applied in the field of material chemistry, can solve the problem of low crystal phase purity of synthetic materials and achieve the effect of increasing capacity

Inactive Publication Date: 2019-12-10
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing synthesis methods include single hydrothermal method, or blending high-temperature calcination method, but the crystal phase purity of the synthetic material is not high, and it is easy to form a situation where multiple crystallinity coexists

Method used

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  • Preparation method of alpha-MnO2 electrode material
  • Preparation method of alpha-MnO2 electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] an α-MnO 2 The preparation method of the electrode material specifically includes the following steps.

[0018] (1) Preparation of MnO by hydrothermal method 2 electrode material.

[0019] Weigh 12.64g of potassium permanganate in a container, add a certain amount of deionized water and magnetically stir to dissolve and mix, then weigh the corresponding 18.12g of manganese sulfate in another beaker, add a certain amount of deionized water and stir magnetically to dissolve. Then slowly add the manganese sulfate solution into the potassium permanganate solution, then transfer the mixed solution to the hydrothermal synthesis reaction kettle, adjust the reaction temperature to 140°C, keep it warm for 12 hours, and then suction filter, dry and grind it into black powder.

[0020] (2) Preparation of MnO by hydrothermal method 2 electrode material.

[0021] The above ground MnO 2 The material was transferred to a porcelain ark, and placed in a tube furnace for annealing...

Embodiment 2

[0023] an α-MnO 2 The preparation method of the electrode material specifically includes the following steps.

[0024] (1) Preparation of MnO by hydrothermal method 2 electrode material.

[0025] Weigh 12.64g of potassium permanganate in a container, add a certain amount of deionized water and magnetically stir to dissolve and mix, then weigh the corresponding 15.12g of manganese chloride in another beaker, add a certain amount of deionized water and stir magnetically to dissolve. Then slowly add the manganese chloride solution into the potassium permanganate solution, then transfer the mixed solution to the hydrothermal synthesis reaction kettle, adjust the reaction temperature to 160°C, keep it warm for 10h, and then suction filter, dry and grind Into black powder.

[0026] (2) The above ground MnO 2 The material was transferred to a porcelain ark, and placed in a tube furnace for annealing and calcination in an air atmosphere. The temperature was kept at 5°C / min to 450...

Embodiment 3

[0028] an α-MnO 2 The preparation method of the electrode material specifically includes the following steps.

[0029] (1) Preparation of MnO by hydrothermal method 2 electrode material.

[0030] Weigh 12.64g of potassium permanganate in a container, add a certain amount of deionized water and magnetically stir to dissolve and mix, then weigh the corresponding 20.76g of manganese acetate in another beaker, add a certain amount of deionized water and magnetically stirred to dissolve. Then slowly add the manganese acetate solution into the potassium permanganate solution, then transfer the mixed solution to the hydrothermal synthesis reaction kettle, adjust the reaction temperature to 150°C, keep it warm for 11 hours, and then suction filter, dry and grind it into black powder.

[0031] (2) The above ground MnO 2 The material was transferred to a porcelain ark, and placed in a tube furnace for annealing and calcination in an air atmosphere. The temperature was kept at 3°C / m...

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Abstract

The invention discloses a preparation method of an alpha-MnO2 electrode material. KMnO4 is used as an oxidant, a bivalent salt of Mn<2+> is used as a reducing agent, by adjusting and controlling the ratio of the raw material KMnO4 and the Mn<2+>, a MnO2 material is synthesized by adopting a hydrothermal method, and then the alpha-MnO2 electrode material with relatively single crystallinity can besynthesized by high-temperature annealing and calcination. According to the preparation method, the prepared alpha-MnO2 electrode material has a good two-dimensional structure, and the capacity of theelectrode material can be greatly improved. The electrode material can be used as a supercapacitor electrode material, an electrocatalytic material and the like.

Description

technical field [0001] The invention belongs to the field of material chemistry. Involves a single crystal form of α-MnO 2 Preparation method of electrode material. Background technique [0002] With the development of the times, the energy problem has become a major problem that plagues the development of the times. Lithium-ion batteries have become the darling of the times due to their high energy density, but their low power density limits their further development. The high power density of supercapacitors just makes up for the shortage of lithium batteries, making the research on supercapacitors increasingly intense. Among many supercapacitor electrode materials, MnO 2 With its high theoretical capacity, it has attracted many people's attention. [0003] Manganese dioxide is a material with abundant resources and low price. It is mainly [MnO 6 ] Octahedron is the basic framework, showing a variety of crystal structures. Manganese dioxide is mainly composed of α,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/02H01G11/46
CPCC01G45/02C01P2002/72C01P2004/03C01P2004/32H01G11/46Y02E60/13
Inventor 陈义旺黄俊李永虎谈利承袁凯
Owner NANCHANG UNIV
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