Synthesis method of carbon nanotube coated FeF3

Abstract

The invention discloses a carbon nanotube coated FeF3 synthesis method, which comprises: S1, using iron oxyhydroxide, cetyltrimethylammonium bromide, resorcinol, a formaldehyde solution and ammonia water as raw materials, carrying out a reaction in a liquid phase, and carrying out solid-liquid separation, washing and drying on the obtained suspension to obtain phenolic resin coated iron oxyhydroxide; s2, carbonization is carried out, and Fe3O4 (at) CNT is obtained; the obtained Fe3O4 (at) CNT is subjected to reduction, and Fe (at) CNT is obtained; and S3, carrying out fluorination, so as to obtain the carbon nano tube coated FeF3. The carbon nanotube coated FeF3 material which is excellent in structure and performance and good in consistency can be synthesized, the problems that existing FeF3 serving as a positive electrode material is poor in conductivity and prone to side reaction with electrolyte, and volume expansion and shrinkage exist in the charging and discharging process are effectively solved, and the method has the advantages of being low in cost, simple in process, easy to implement and the like.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery materials, in particular to a carbon nanotube-coated FeF 3 synthetic method. Background technique [0002] Carbon Nanotube (Carbon Nanotube, CNT) was discovered in January 1991 by Sumio Iijima, a physicist at the NEC Laboratory in Tsukuba, Japan, using a high-resolution transmission electron microscope to produce carbon fibers from the product of the arc method. It is a tubular carbon molecule, each carbon atom on the tube takes sp 2 Hybridization, combined with carbon-carbon σ bonds to form a honeycomb structure composed of hexagons as the skeleton of carbon nanotubes. A pair of p-electrons on each carbon atom that does not participate in hybridization forms a conjugated π-electron cloud that spans the entire carbon nanotube. According to the number of layers of the tube, it can be divided into single-walled carbon nanotubes and multi-walled carbon nanotubes. The radial direction ...

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Problems solved by technology

[0011] In view of the deficiencies in the prior art, the object of the present invention is to provide a synthetic carbon nanotube coated FeF 3 The synthesis method effectively solves the existing FeF 3 As a positive electrode material, the electrical conductivity is poor, and it is easy to have side reactions with the electrolyte, and there are problems such as volume expansion and contraction during the charge and discharge process. It can synthesize carbon nanotube-coated FeF with excellent structure and performance. 3 material, this method has the advantages of low cost, simple and easy process, good consistency and good performance of the prepared material

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