Two-dimensional silicon dioxide as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of materials, and particularly relates to two-dimensional silicon dioxide as well as a preparation method and application thereof. The method comprises the following steps of acidizing a calcium silicide alloy to obtain siloxene, and carrying out heat treatment on the siloxene in an air atmosphere to prepare the two-dimensional silicon dioxide. According to the method, the two-dimensional silicon dioxide is obtained through acid treatment and heat treatment in the air atmosphere by adopting a commercial precursor, an expensive template agent is not needed in the whole preparation process, the precursor is also a commercially available material, the whole preparation process is few in step and simple in process, and large-scale and low-cost preparation of the two-dimensional silicon dioxide can be realized. The two-dimensional silicon dioxide prepared by the invention not only can be used as a negative electrode material in a lithium battery, shows excellent cycling stability, but also can be used for preparing a diaphragm with high thermal stability.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a two-dimensional silicon dioxide and its preparation method and application. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Silica is one of the most common materials in life, and it is also the material that humans have used for the longest time since the Stone Age. Due to its structural advantages, two-dimensional silica has important potential value in nanomechanics and nanoelectronics. The existing preparation methods mainly include exfoliation method, CVD method and template method. In nature, phyllosilicate has a sandwich sheet structure of two tetrahedr...

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Problems solved by technology

However, this method requires other 2D materials as templates, which are generally not easy to obtain directly, and the prepared SiO 2 The template of the nanosheet is difficult to remove, and pure Si cannot be obtained. 2 Nanosheets

For example, the prior art discloses a method of using graphene oxide as a template and tetraethyl orthosilicate as a silicon source to obtain two-dimensional silica nanosheets after freeze-drying and sintering, wherein the use of templates makes the entire preparation process Complicated, it needs to go through the process of introducing a template agent and then removing the template agent, which may not be able to be removed completely. Moreover, graphene oxide as a template agent greatly increases the preparation cost of two-dimensional silica, which is not suitable for large-scale industrialization Production

The CVD method is to grow a silicon precursor on a substrate (such as a silicon wafer) under a specific pressure and temperature. This method requires special equipment, high cost, harsh preparation conditions, low yield, and is difficult to prepare on a large scale

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