Graphene-coated porous red phosphorus, conductive carbon composite material, preparation method and application

Abstract

The invention discloses a graphene wrapped porous red phosphorus-conductive carbon composite material, which comprises a red phosphorus-conductive carbon composite material. The red phosphorus-conductive carbon composite material comprises at least one red phosphorus particle and a plurality of conductive carbon particles adhered on the surface of red phosphorus. The surface of the red phosphorusparticle(s) has a porous structure. At least one graphene layer is wrapped on the external side of the red phosphorus-conductive carbon composite material. The preparation method of the graphene wrapped porous red phosphorus-conductive carbon composite material comprises following steps: (a) preparing a red phosphorus-conductive carbon composite material; (b) preparing a porous red phosphorus-conductive carbon composite material; and (c) preparing the graphene wrapped porous red phosphorus-conductive carbon composite material. The invention also discloses an application of the graphene wrappedporous red phosphorus-conductive carbon composite material as an alkali metal ion battery anode material.

Description

technical field [0001] The invention relates to the field of electrochemical energy storage and new energy of power supply technology, specifically a graphene-coated porous red phosphorus, conductive carbon composite material, preparation method and application. Background technique [0002] Energy and environmental issues have become important issues of concern to all countries in the world. The crisis of fossil energy reserves, as well as the global temperature rise and environmental degradation caused by the massive consumption of fossil energy, have become more and more prominent with the increasing demand for energy in various countries. Energy and environmental issues have become human survival and sustainable development. obstacles to development. The increasingly severe energy problems have greatly promoted the development of renewable energy and energy storage technologies, especially the rapid development of portable electronic products, new energy electric vehicl...

AI Technical Summary

Problems solved by technology

[0003] Red phosphorus can form alloys with metals such as lithium and sodium, and its theoretical capacity is as high as 2600 mAh / g, which is dozens of times that of carbon-based anode materials. It is a very potential metal alloy anode material, but red phosphorus has the following disadvantages Hinder its application: (1) severe volume expansion during alloying (volume expansion rate is about 300%); (2) low electronic conductivity of the material itself (10-14 S / cm)

The current solution is to (1) introduce a conductive buffer framework to increase the conductivity of the material and inhibit the volume expansion of the material during charging and discharging, such as synthesizing phosphorus-based composite materials, combining red phosphorus with a single carbon (carbon black, carbon tube, graphene, etc.) or form an alloy with other metals to enhance its electronic conductivity and cycle stability. This method often requires a lot of carbon added, and there is a problem of agglomeration, and the conductive effect is not very good; (2) Red Phosphorus particles are nanosized, and red phosphorus is nanosized and composited with carbon by evaporation and condensation

This method can realize the uniform loading of red phosphorus nanoparticles on carbon materials, but the synthesis amount is small, the phosphorus loading is often very low, the conditions are harsh, and the process is prone to produce toxic white phosphorus, which is difficult for industrial production

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