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Polyethylene imine/manganese dioxide nano sheet multiple-layer composite film and preparation method thereof

A technology of polyethyleneimine and manganese dioxide, applied in chemical instruments and methods, lamination, layered products, etc., can solve the problems of high utilization rate, large specific capacity, shortening ion diffusion distance, etc., and achieve high utilization rate , large specific capacity, good electrochemical cycle stability

Inactive Publication Date: 2008-09-03
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this multilayer composite film electrode, the manganese dioxide nanosheet has a large specific surface area and the electrochemically active sites are fully exposed, so the utilization rate of manganese dioxide is high and the specific capacity is large; the thickness of the multilayer composite film is at the nanometer or submicron level , is conducive to the transfer of electrons on the electrode, and can shorten the diffusion distance of ions in the electrolyte in the electrode material, the electrode reacts quickly, has good rate characteristics and high specific power; the multilayer composite thin film electrode material can give full play to the inorganic The synergistic effect with organic components overcomes the problems of poor toughness of inorganic oxides and poor thermal stability of polymers. The multilayer composite thin film electrode material has good structural stability and can enhance its electrochemical cycle stability.

Method used

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  • Polyethylene imine/manganese dioxide nano sheet multiple-layer composite film and preparation method thereof
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  • Polyethylene imine/manganese dioxide nano sheet multiple-layer composite film and preparation method thereof

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Effect test

Embodiment 1

[0038] A. Preparation of manganese dioxide nanosheet sol:

[0039] 200mL containing 0.6mol / L NaOH and 1.5mol / L H 2 o 2 The mixed solution was added to 100mL containing 0.4mol / L Mn(NO 3 ) 2 solution, stirred and reacted for 30 minutes, filtered, and the filter cake was transferred to a 100mL polytetrafluoroethylene cup; 40mL of NaOH solution with a concentration of 2.0mol / L was added to the polytetrafluoroethylene cup, stirred to form a paste, and then The polytetrafluoroethylene cup was sealed in a hydrothermal kettle, and hydrothermally treated at 160°C for 15 hours; after that, the hydrothermal kettle was naturally cooled to room temperature, and the kettle was opened for suction filtration, and the filter cake was washed with distilled water until the pH value of the filtrate was 8. Dry in an air atmosphere at 70°C for 9 hours to obtain a layered manganese dioxide solid powder;

[0040] Weigh 2.5g of layered manganese dioxide solid powder and add to 300mL of HNO with a ...

Embodiment 2

[0048] A. Preparation of manganese dioxide nanosheet sol:

[0049] 200mL containing 0.6mol / L NaOH and 1.0mol / L H 2 o 2 The mixed solution was added to 100mL containing 0.3mol / L Mn(NO 3 ) 2 In the solution, stir and react for 20 minutes, filter, and transfer the filter cake to a 100mL polytetrafluoroethylene cup; The polytetrafluoroethylene cup was sealed in a hydrothermal kettle, and hydrothermally treated at 150° C. for 20 hours; after that, the hydrothermal kettle was naturally cooled to room temperature, and the kettle was opened for suction filtration, and the filter cake was washed with distilled water until the pH value of the filtrate was 9. Dry the filter cake in an air atmosphere at 80°C for 6 hours to obtain a layered manganese dioxide solid powder;

[0050] Weigh 2.0g of layered manganese dioxide solid powder and add to 200mL of HNO with a concentration of 1.5mol / L 3 solution, stirred and reacted at room temperature for 5 days, during which a new 1.5mol / L HNO w...

Embodiment 3

[0058] A. Preparation of manganese dioxide nanosheet sol:

[0059] 200mL containing 0.8mol / L NaOH and 1.6mol / L H 2 o 2 The mixed solution was added to 100mL containing 0.4mol / L Mn(NO 3 ) 2 In the solution, stir and react for 20 minutes, filter, and transfer the filter cake to a 100mL polytetrafluoroethylene cup; And the polytetrafluoroethylene cup was sealed in a hydrothermal kettle, and hydrothermally treated at 150° C. for 18 hours; after that, the hydrothermal kettle was naturally cooled to room temperature, the kettle was opened for suction filtration, and the filter cake was washed with distilled water until the pH value of the filtrate was 9. Dry the filter cake in an air atmosphere at 70°C for 8 hours to obtain a layered manganese dioxide solid powder;

[0060] Weigh 2.5g of layered manganese dioxide solid powder and add to 300mL of HNO with a concentration of 1.2mol / L 3 solution, stirred and reacted at room temperature for 4 days, during which a new 1.2mol / L HNO w...

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Abstract

The invention provides a polyethyleneimine / manganese dioxide nm multilayer composite membrane and preparation method, belonging to super capacitor electrode material technical field. The chemical composition of multilayer composite membrane is PEI / MNS)n, wherein PEI is polyethyleneimine, MNS is manganese dioxide nm sheet with negative charge, n is number of layers of multilayer composite membrane and 3<=n<=20. The polyethyleneimine with positive charge and managanese dioxide nm sheet with negative charge are recurrently deposited in turn on a substrate after surface treatment by static self-assembly technique. The multilayer composite membrane as electrode material of super capacitor has features of high specific capacitance, good magnification characteristic and excellent electrochemical cycle performance, in addition, the preparation method can perform at room temperature and under solution system. The dear device is not necessary and the operation is convenient and material cost is low.

Description

technical field [0001] The invention belongs to the technical field of thin film supercapacitor electrode materials. In particular, a polyethyleneimine / manganese dioxide nanosheet multilayer composite film and a preparation method thereof are provided, which are used in film supercapacitors. Background technique [0002] In recent years, with the rapid development of microelectronic devices such as microelectromechanical systems, dynamic random access memory, VLSI, and implantable medical microsystems, people's demand for high power density, high energy density miniature power supply equipment The demand increased rapidly. The research and development of thin-film micro-power sources such as thin-film batteries and thin-film supercapacitors have been increasingly concerned and valued by people. Thin-film supercapacitors can be used independently as a micro-power supply, or can be combined with thin-film batteries to form a composite micro-power supply system to meet the re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L39/02C08K3/22C08J5/18B32B27/28B32B38/08B32B37/02
Inventor 杨文胜张熊
Owner BEIJING UNIV OF CHEM TECH
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