Polypyrrole-coated porous sodium manganate composite material, preparation method and application thereof

A technology of porous sodium manganate and composite materials, which can be used in electrical components, electrochemical generators, battery electrodes, etc., and can solve the problems of poor electrochemical cycle performance and rate performance.

Active Publication Date: 2019-11-26
SHANDONG IND TECH RES INST OF ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, nanonized sodium manganate cannot solve the problem of poor electrochemical cycle performance and rate performance due to the dissolution of manganese ions during cycling.

Method used

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  • Polypyrrole-coated porous sodium manganate composite material, preparation method and application thereof
  • Polypyrrole-coated porous sodium manganate composite material, preparation method and application thereof
  • Polypyrrole-coated porous sodium manganate composite material, preparation method and application thereof

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preparation example Construction

[0034] The present invention also provides a preparation method of the polypyrrole-coated porous sodium manganate composite material described in the above technical scheme, comprising the following steps:

[0035] Potassium permanganate, glucose and water are mixed, carry out hydrothermal reaction, obtain manganese carbonate solid cube;

[0036] After the manganese carbonate solid cube and sodium hydroxide are mixed and ground, calcined to obtain a porous sodium manganate cube;

[0037] Mixing pyrrole monomer, water and sodium perchlorate to obtain a mixed solution;

[0038] The porous sodium manganate cube is immersed in the mixed solution to obtain a polypyrrole-coated porous sodium manganate composite material (the specific preparation process is as follows: figure 1 shown).

[0039] In the present invention, unless otherwise specified, all raw material components are commercially available products well known to those skilled in the art.

[0040] In the invention, pota...

Embodiment 1

[0057] Mix 0.005mol potassium permanganate and 100mL water to obtain potassium permanganate solution; mix with 0.004mol glucose, perform hydrothermal reaction (140°C, 14h), filter to obtain 0.005mol manganese carbonate solid cube;

[0058] After mixing and grinding 0.005mol manganese carbonate solid cube and 0.005mol sodium hydroxide, it was calcined (650°C, 4h) to obtain 0.005mol porous sodium manganate cube (Na 0.91 MnO 2 );

[0059] Mix 5mL of pyrrole, 100mL of water and 0.0006mol of sodium perchlorate to obtain a mixed solution;

[0060] Immerse 0.0025mol porous sodium manganate cube in 100mL mixed solution, and continuously feed N 2 , impregnated (25°C, 6h) to obtain a polypyrrole-coated porous sodium manganate composite material (the mass ratio of polypyrrole to porous sodium manganate is 1:19);

[0061] The porous sodium manganate cube is carried out SEM test, test result is as follows image 3 shown by image 3 It can be seen that the particle diameter of the poro...

Embodiment 2

[0064] Mix 0.004mol potassium permanganate and 100mL water to obtain potassium permanganate solution; mix with 0.003mol glucose, perform hydrothermal reaction (135°C, 13h), filter to obtain 0.004mol manganese carbonate solid cube;

[0065] After mixing and grinding 0.004mol manganese carbonate solid cubes and 0.004mol sodium hydroxide, they were calcined (700°C, 3h) to obtain 0.004mol porous sodium manganate cubes (Na 0.91 MnO 2 );

[0066] Mix 4mL of pyrrole, 100mL of water and 0.0005mol of sodium perchlorate to obtain a mixed solution;

[0067] Immerse 0.002mol porous sodium manganate cube in 100mL mixed solution, and continuously feed N 2 , impregnated (25°C, 6h) to obtain a polypyrrole-coated porous sodium manganate composite material (the mass ratio of polypyrrole to porous sodium manganate is 7:93);

[0068] According to the test shown in Example 1, the product of this example was tested by SEM and TEM, and the test results were similar to Example 1. The particle siz...

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Abstract

The invention relates to the technical field of electrode materials, in particular to a polypyrrole-coated porous sodium manganate composite material, a preparation method and application thereof. Thepolypyrrole-coated porous sodium manganate composite material comprises porous sodium manganate and polypyrrole coated on the surface of the porous sodium manganate; and the porous sodium manganate is cubic, and the chemical formula thereof is Na<x>MnO2, wherein x is equal to 0.91. The polypyrrole-coated porous sodium manganate composite material disclosed by the invention has good electrochemical cycling stability and rate performance as a positive electrode material of a sodium ion battery. The invention further provides a preparation method of the polypyrrole-coated porous sodium manganatecomposite material. The preparation method can be carried out at a low temperature, and energy can be effectively saved.

Description

technical field [0001] The invention relates to the technical field of electrode materials, in particular to a polypyrrole-coated porous sodium manganate composite material and a preparation method and application thereof. Background technique [0002] Among the cathode materials for sodium-ion batteries, the theoretical capacity of the layered sodium manganate material is as high as 243mAh / g, much higher than other materials, and its electrochemical window is wider. However, this type of material has the disadvantages of poor electrical conductivity and poor cycle performance caused by the inherent Jahn-Teller effect. In order to solve the problem of poor electrical conductivity of materials, increasing the content of sodium ions in the layered sodium manganate structure is an effective method to improve its intrinsic conductivity. For layered sodium manganate materials, increasing the content of sodium ions can increase the interlayer spacing, which is conducive to the de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/62H01M10/054
CPCH01M4/366H01M4/505H01M4/624H01M10/054Y02E60/10
Inventor 涂江平陆迪王秀丽杨涛
Owner SHANDONG IND TECH RES INST OF ZHEJIANG UNIV
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