Honeycomb stannic oxide material and preparation method thereof

Abstract

The invention provides a preparation method of a honeycomb stannic oxide material, belongs to the technical field of preparation of lithium (sodium) ion battery electrode materials, and mainly aims to solve the problems of poor cycle stability and low specific capacity of conventional electrode materials. The method comprises the following steps: one, mixing a certain proportion of tetraethoxysilane, ethanol, water and ammonia water, stirring at room temperature to obtain silica beads; two, growing a layer of stannic oxide on the silica beads prepared in the step one by a hydrothermal method; and three, with sodium chloride as a template and glucose as a carbon source, carbonizing at high temperature to obtain a carbon film coating the nano beads, and etching silica by using sodium hydroxide, to obtain the honeycomb stannic oxide/carbon composite material. The stannic oxide/carbon composite material prepared by the template method shows excellent electrochemical performance such as high specific capacity and good cycle stability in lithium (sodium) ion batteries.

Description

technical field [0001] The invention belongs to the field of materials and electrochemical energy storage devices, and more specifically relates to a honeycomb tin dioxide material and a preparation method thereof. Background technique [0002] With the increasing demand for fossil fuels in modern life and industrial production, the earth is facing increasingly severe environmental problems, which also stimulates people to explore clean and renewable energy that can be applied on a large scale, and for most renewable energy, For example, solar energy and wind energy are intermittent, so the development of high-efficiency energy storage technology is particularly important for the large-scale application of renewable energy. [0003] As an excellent energy storage device, secondary lithium-ion batteries have developed rapidly in recent years and are widely used in various portable electronic devices and electric vehicles. At the same time, due to the limitation of lithium res...

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Problems solved by technology

For example, Lei Zhang et al. have prepared a porous tin dioxide hollow microcube structure by a selective etching method. The advantage is that the porous and hollow structure can provide more surface reaction sites, but the pure tin dioxide material is full of microcubes. The volume expansion during the discharge process is severe, and it is easy to agglomerate and has low stability, which brings great difficulties to the application of materials (Energy Environ.Sci., 2014, 7, 1013–1017); Jianping Li et al. prepared tin dioxide by template method / carbon core-shell sphere structure, the advantage is that the core-shell structure not only provides a certain buffer space, but also the carbon coating layer further avoids the agglomeration of tin dioxide, providing reliable cycle stability for the negative electrode material, however The dispersion of nanospheres leads to obstacles in the transport of electrons or ions during charge and discharge, which has a certain impact on the performance of electrode materials, especially the rate characteristics (CrystEngComm, 2014, 16, 517)

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