A kind of spherical s/c@moo2 composite material and its preparation method and application

Abstract

The invention relates to a spherical S / C@MoO 2 Composite materials and their preparation methods and applications. The composite material is prepared through the following steps: 1) reacting phosphomolybdic acid and tetrabutylammonium bromide to obtain TBA 3 PMo 12 o 40 ; 2) SiO 2 / C is added in the toluene solution; 3) TBA 3 PMo 12 o 40 Dissolved in the acetonitrile solution, this mixed solution is added in step 2) to obtain SiO 2 / C@TBA 3 PMo 12 o 40 ; 4) The product is calcined at high temperature to obtain SiO 2 / C@MoO 2 ;5) C@MoO was obtained by etching with HF 2 ;6) Convert C@MoO 2 Mix and grind with sublimed sulfur to obtain S / C@MoO 2 composite material. The composite material can be used as a cathode material for lithium-sulfur batteries. The method of the invention is simple and feasible, and the cost is low; the prepared composite material has uniform appearance, high specific surface area and large pore volume, and has the effect of improving the coulombic efficiency and cycle stability of the battery.

Description

technical field [0001] The invention belongs to the field of chemical batteries, in particular to a spherical S / C@MoO 2 Composite materials and their preparation methods and applications. Background technique [0002] With the increasing depletion of fossil fuels and the increasingly serious environmental problems caused by their combustion, it is urgent to find new energy sources. At the same time, the rapid development of portable devices such as mobile phones, notebook computers, digital cameras, and electric vehicles, and the Secondary batteries are widely used. Among them, lithium-ion secondary batteries, which appeared in the 1990s, are a new generation of chemical power sources recognized in the world, and have been successfully commercialized and rapidly developed in the field of portable devices. However, in the fields of electric vehicles, aerospace and national defense equipment, the current commercial lithium-ion secondary batteries are limited by energy densit...

AI Technical Summary

Problems solved by technology

However, in the fields of electric vehicles, aerospace and national defense equipment, the current commercial lithium-ion secondary batteries are limited by the energy density, which is far from meeting the needs of technological development.

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