Nitrogen and phosphorus co-doped composite material, preparation method and application and capacitor electrode

Abstract

The invention relates to a preparation method of a nitrogen and phosphorus co-doped carbon nanotube-coated iron compound composite material. The method comprises the following steps of (S1) mixing egg yolk, deionized water and an iron compound and carrying out ultrasonic treatment for 20-40 minutes; (S2) after ultrasonic treatment is completed, dissolving for 20-40 minutes while stirring; (S3) after stirring and dissolving are completed, fully drying completely at 100-140 DEG C to obtain a crude product; and (S4) carrying out high-temperature roasting treatment on the crude product under inert gas protection to obtain the nitrogen and phosphorus co-doped carbon nanotube-coated iron compound composite material. The invention further relates to a composite material and a capacitor electrode prepared from the composite material. The composite material has excellent electrical properties, can be applied to the field of preparation of a capacitor, especially the capacitor electrode, and has good application prospect and industrialization potential.

Description

technical field [0001] The present invention relates to a composite material and its preparation method, use and products prepared therefrom. More specifically, it provides a nitrogen-phosphorus co-doped composite material, its preparation method, use and capacitor electrodes prepared therefrom, belonging to Inorganic functional materials and electrochemical energy technology fields. Background technique [0002] In recent years, the shortage of petrochemical resources and the sharp increase in environmental protection pressure have formed irreconcilable contradictions with the needs of rapid economic growth, seriously affecting my country's economic and social development and national security. It is estimated that by 2050, the global energy demand will be at least twice the current demand, so adopting sustainable and renewable energy is an urgent and arduous task. [0003] Correspondingly, the use of petrochemical resources leads to environmental pollution, and energy con...

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Problems solved by technology

in 300g -1 Under this condition, the specific capacitance is still 269.04F·g -1 , the energy density is still 45.50wh·kg -1 , but poor cycle stability

[0013] As mentioned above, the prior art discloses a variety of methods of using biomass to prepare new materials, and thus obtains a variety of new materials with excellent electrical properties, but these new materials can be made from biomass through direct carbonization and activation. It has properties such as porosity and high specific surface area, but in terms of electrical properties, there are still defects such as high current charge and discharge, low energy density, etc., which seriously limits its practical application and industrial production

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