One-dimensional Bi-doped carbon nanowire composite material and preparation method and application thereof

Abstract

The invention discloses a one-dimensional Bi-doped carbon nanowire composite material and a preparation method and application thereof. The one-dimensional Bi-doped carbon nanowire composite material is homogeneous in structure, regular and uniform in bismuth particle and completely embedded into carbon nanowires. The preparation method has the advantages of simple materials, availability to the materials, low price, simple synthesis method and environmental friendliness. The one-dimensional Bi-doped carbon nanowire composite material is high in cycling stability and specific capacity and capable of effectively inhibiting alloying volume expansion during cycling when used as lithium ion and sodion battery cathode materials, and is as high as 300 mAh g<-1> in capacity after 500 circles of cycling under the condition of 100 mA g<-1> and as high as 290 mAh g<-1> in capacity after 500 circles of cycling under the condition of 100 mA g<-1> when used as the lithium ion battery cathode material.

Description

technical field [0001] The invention belongs to the fields of energy storage materials, new energy sources and electrochemistry, in particular to a one-dimensional bismuth-doped carbon nanowire composite material, its preparation method and application. Background technique [0002] With the increasing demand for energy in the world, oil, coal, natural gas, etc. are rapidly consumed as main energy sources, and their combustion will also produce greenhouse gases and other toxic and harmful substances (SO 2 , NO 2 etc.), therefore, finding renewable green energy is the most urgent task at present. [0003] As a new energy source in the 1990s, lithium-ion batteries have attracted widespread attention and are widely used in electric vehicles, mobile devices, power station energy storage and other fields. However, with the continuous development in recent decades, the serious consumption of lithium resources, the difficulty in the preparation and synthesis of lithium metal, and...

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Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a one-dimensional bismuth-doped carbon nanowire composite material and its preparation method and application. The purpose is to use electrospinning technology and BiCl 3 Combining reduction methods, the active material Bi is embedded in carbon nanowires to prepare a bismuth-doped carbon nanowire composite material of the present invention, and it is applied to lithium ion and sodium ion battery negative electrode materials, thus solving the problem of prior art Bi Composite materials used as negative electrode materials for lithium-ion and sodium-ion batteries have problems such as poor cycle stability, low specific capacity, and volume expansion of alloying during cycling.

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