Amorphous MnO2 and preparation method and application thereof

A manganese dioxide, amorphous technology, applied in the field of materials, can solve the problems of increasing the cost of lithium ion batteries, restricting the application of lithium ion batteries, shortage of lithium resources, etc., achieving good cycle stability, low reaction environment requirements, and high specific capacity. Effect

Active Publication Date: 2018-10-09
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology

However, with the large-scale use of lithium batteries, the reserves of lithium resources on the earth are not ideally sufficient, which has caused the shortage of lithium resources and th

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  • Amorphous MnO2 and preparation method and application thereof
  • Amorphous MnO2 and preparation method and application thereof
  • Amorphous MnO2 and preparation method and application thereof

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[0027] Example

[0028] At room temperature, 1.58 g of KMnO 4 and 3.68g Mn (CH 3 COO) 2 ·4H 2 O were prepared into 50 mL solutions with deionized water, KMnO 4 The solution was magnetically stirred, and then the Mn(CH 3 COO) 2 ·4H 2 O solution was added dropwise to KMnO 4 The solution was stirred for 5 minutes to form a homogeneous solution. Prepare 10 mL of KOH solution with a concentration of 0.16 g / L, add it to the above homogeneous solution, and keep magnetic stirring at room temperature for 4 h to obtain a dark brown precipitate, which is washed several times with deionized water and anhydrous ethanol, and the precipitate is placed in an oven Dry at 85°C for 12h, grind evenly with a mortar, and calcinate at 400°C for 3h in an air atmosphere to obtain the sample manganese dioxide.

[0029] The synthesized MnO 2 The material and the conductive agent (graphite:carbon black=4:6) were mixed in a ball mill in a mass ratio of 7:2, dried in a planetary ball mill for two

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Abstract

The invention relates to amorphous MnO2 and preparation method and application thereof. The preparation method comprises the following steps of (1) mixing a KMnO4 solution and a Mn(CH<3>COO)<2>.4H<2>Oto prepare a uniform solution; (2) adding a KOH solution into the uniform solution obtained in the step (1), and performing stirring to obtain a deep brown precipitant; and (3) washing, drying, grinding and calcining the deep brown precipitant obtained in the step (2) to obtain an amorphous MnO2 material. The prepared amorphous MnO2 is used for a sodium ion battery positive electrode material. Compared with the prior art, the synthesis process is simple, the reaction condition is simple, the reaction environment requirement is low, and the preparation method is suitable of industrialization on a large scale; the amorphous MnO2 material is used as the sodium ion battery positive electrode material and has relatively large specific area, the sodium ion mobility is greatly improved, relatively high specific capacity and favorable cycle stability are shown.

Description

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Application Information

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Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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