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Positive electrode, manufacturing method thereof and battery using positive electrode

A positive electrode, carbon nanotube technology, applied in the field of positive electrode and its preparation, can solve the problems of insufficient mechanical properties, electrical properties and chemical properties, preventing the commercial development of Li/S batteries, short cycle life, etc., to achieve enhanced sulfur-carrying effect. , The effect of increasing the speed and prolonging the cycle life

Active Publication Date: 2020-03-03
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the short cycle life due to low sulfur utilization and rapid capacity fading hinders the commercial development of Li / S batteries
At present, although carbon nanotubes can be used as current collectors, their mechanical, electrical and chemical properties are not enough to solve the above problems

Method used

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  • Positive electrode, manufacturing method thereof and battery using positive electrode
  • Positive electrode, manufacturing method thereof and battery using positive electrode
  • Positive electrode, manufacturing method thereof and battery using positive electrode

Examples

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preparation example Construction

[0041] See figure 1 and Figure 9 , the first embodiment of the present invention provides a method for preparing a carbon nanotube composite structure 10, comprising the following steps:

[0042] S11, dispersing a plurality of carbon nanotubes 12 in water to form a carbon nanotube dispersion;

[0043] S12, adding an aniline solution to the carbon nanotube dispersion to form a mixed solution, the aniline solution is formed by dissolving aniline in a solvent;

[0044] S13, adding an initiator to the mixed solution to initiate the polymerization of the aniline to form a carbon nanotube composite structure preform;

[0045] S14, freeze-drying the carbon nanotube composite structure preform in a vacuum environment; and

[0046] S15, after freeze-drying, carbonization is performed under a protective gas to obtain the carbon nanotube composite structure 10 .

[0047] In step S11 , the plurality of carbon nanotubes 12 include single-wall carbon nanotubes 12 , double-wall carbon n...

Embodiment

[0056] Using a cell ultrasonic instrument, 100 mg of carbon nanotubes scraped off from the super-parallel carbon nanotube array and 15 mg of polyvinylpyrrolidone (PVP K90) were ultrasonically dispersed in pure water for 30 minutes to form a uniform carbon nanotube dispersion. Then the carbon nanotube dispersion was transferred to a three-neck flask, cooled with an ice bath and stirred magnetically. Dissolve 150 μL of aniline (ANI, J&K Scientific, 98.5%) in 20 ml of ultrapure water to form an aqueous solution of aniline, and then add 5 mL of hydrochloric acid (0.1 mol L -1 ), forming an aniline solution. Then slowly add the prepared aniline solution into the carbon nanotube dispersion, and continue stirring for 30 minutes after the dropwise addition is completed. Then, 50 mL of ammonium persulfate aqueous solution (ammonium persulfate 368 mg) was slowly added dropwise under vigorous stirring and nitrogen flow, and after stirring for 24 hours, a CNT / PANI hydrogel was formed. T...

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Abstract

The invention relates to a manufacturing method for a positive electrode, which comprises the following steps of: dispersing a plurality of carbon nanotubes in water to form a carbon nanotube dispersion liquid, adding an aniline solution to the carbon nanotube dispersion liquid to form a mixed liquid, the aniline solution comprising aniline, adding an initiator into the mixed solution and polymerizing the aniline into polyaniline under the action of the initiator so as to obtain a carbon nanotube composite structure prefabricated body, carrying out freeze drying on the carbon nanotube composite structure prefabricated body in a vacuum environment, after freeze drying, carbonizing under protective gas to form a carbon nanotube composite structure, and adding an electrode active material into the carbon nanotube composite structure. The invention also relates to the positive electrode manufactured by using the manufacturing method, and a battery using the positive electrode.

Description

technical field [0001] The invention relates to a positive pole, a preparation method thereof, and a battery using the positive pole. Background technique [0002] Since the early 1990s, nanomaterials represented by carbon nanotubes have attracted great attention due to their unique structures and properties. In recent years, with the continuous deepening of research on carbon nanotubes and nanomaterials, their broad application prospects continue to emerge. For example, due to the unique electromagnetic, optical, mechanical, and chemical properties of carbon nanotubes, a large number of researches on their application in fields such as field emission electron sources, sensors, new optical materials, soft ferromagnetic materials, and lithium batteries have been continuously studied. reports. [0003] With the emergence of lithium / sulfur (Li / S) batteries, the application of carbon nanotubes in Li / S batteries is a hot spot of concern. Li / S battery is a kind of lithium batte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M10/0525C01B32/158
CPCH01M4/36H01M4/583H01M4/625H01M10/0525C01B32/158H01M10/054H01M10/052H01M4/5815H01M4/382H01M4/381H01M4/38H01M4/136H01M4/663H01M4/667H01M4/1397H01M4/0404H01M4/0416Y02E60/10H01M4/133H01M2004/028H01M4/0471
Inventor 张跃钢贾鲁婕王健吴扬范守善
Owner TSINGHUA UNIV
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