Preparation method of Cu-BTC-derived decahedron Cu<1.8>Se/C composite material

Abstract

The invention relates to a preparation method of a Cu-BTC-derived decahedron Cu<1.8>Se / C composite material. The method comprises preparation of metal-organic framework Cu-BTC and synthesis of Cu<1.8>Se / C. The prepared Cu-BTC-derived decahedron Cu<1.8>Se / C composite material maintains a regular decahedron structure, has the relatively complete morphology, is not easy to agglomerate, has high product purity, has a high specific surface area and porosity, shows excellent lithium storage property and good electrical conductivity and has very good cycle stability and higher discharge specific capacity, under the current density of 100 mA g<-1>, the first discharge specific capacity is 1078.7 mAh g<-1>, after 100 charge-discharge cycles, the discharge specific capacity is 942.6 mAh g<-1>, coulomb efficiency is high, and the prepared material can be utilized as a negative electrode material in a lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of preparation of nano functional materials, in particular to a novel nanocomposite material Cu derived from metal organic framework Cu-BTC 1.8 The preparation method of Se / C. Background technique [0002] With the development of science and technology, energy storage and application are important issues to be solved urgently in human society. Lithium-ion batteries are considered to be the most promising energy storage and transmission devices because of their advantages such as high energy density, long cycle life, environmental protection, no memory effect, and portability, and can be widely used in military and civilian electronic products. For example: new energy electric vehicles, mobile phones, laptops, cameras and many other digital electronic products. With the development of society and the advancement of science and technology, the social demand for lithium-ion batteries for portable electronic d...

AI Technical Summary

Problems solved by technology

However, as a negative electrode material based on conversion reactions, metal selenides, like metal oxides and sulfides, cannot avoid structural collapse and volume expansion effects during the charging and discharging process, resulting in broken and pulverized active materials and rapid capacity decay.

In order to buffer the expansion stress, which causes the phenomenon of battery capacity attenuation and shortened service life, the main modification method currently adopted is to compound with carbon materials with excellent mechanical properties, and to prepare porous micro-nano structures

[0005] Metal-organic frameworks (metal-organic frameworks), referred to as MOFs, are organic-inorganic hybrid materials with molecular pores formed by the self-assembly of organic ligands and metal ions through coordination bonds. High, controllable structure and other advantages, but lithium-ion batteries using MOF materials directly as electrodes have disadvantages such as small specific capacity

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