Method for preparing silicon nanosheets by electrochemistry based on gradiently increased temperature and current

Abstract

The disclosure provides a method for preparing silicon nanosheets by microplasma electrochemistry based on gradiently increased temperature and current and belongs to the technical field of nano-material preparation, which specifically includes: pre-electrolyzing molten chloride electrolyte for deep oxygen removal; placing solid silicate as a silicon source in the molten chloride electrolyte, and suspending a microplasma cathode above the solid silicate; and initiating microplasma to start electrolytic reaction under protection of inert atmosphere, in which solid-state reduction reaction is realized to directly prepare the silicon nanosheets by applying a dynamically increasing temperature gradient or current gradient during an electrolytic process. This method needs no template and has high product purity, a controllable thickness of silicon nanosheets, good crystallinity, and simple process equipment, thus providing high-quality silicon nano-materials for the fields of negative electrodes of high-performance lithium-ion batteries, photodetectors and the like.