Method for preparing composite sodium negative electrode for sodium-ion battery

Abstract

The invention discloses a method for preparing a composite sodium negative electrode for a sodium-ion battery and belongs to the field of new energy materials. According to the method disclosed by the invention, metal sodium is deposited in gaps of a three-dimensional carbon material or a foamed porous material and other carriers through a hot infusion melting method or an electrodeposition method, so that the composite sodium negative electrode is prepared, wherein the three-dimensional carbon material is applied to providing a sufficient space for pre-stored sodium in the preparation process and providing a carrier for receiving the metal sodium in the battery cycle process. The composite sodium negative electrode can be widely applied to the sodium-ion battery, a sodium air battery, a sodium-sulfur cell and other sodium metal batteries, is assembled into a sodium-ion symmetric cell to still keep a stable voltage platform under high current density, is capable of inhibiting sodium dendritic growth and stabilizing volume change of the sodium electrode in the battery cycle process, and has the advantages of good cycling stability, long service life and the like. The method disclosed by the invention is rich and cheap in carrier materials, controllable in preparation process, low in production cost and capable of realizing batch production.

Description

technical field [0001] The invention discloses a preparation method of a composite sodium negative electrode for a sodium ion battery. The sodium metal is deposited in the pores of a three-dimensional carbon material or a foam porous material mainly through a heat infusion melting method or an electrodeposition method to prepare a composite sodium negative electrode, which belongs to a new method. In the field of energy materials, it particularly relates to the preparation of composite sodium negative electrode materials for sodium ion batteries. Background technique [0002] In the information age of today's world, with the rapid development of industries such as electronics, information and new energy vehicles, new energy storage devices have become the focus of scientific and technological development, while the research and development of high-performance, high-capacity sodium-ion batteries have become Current research hotspots in the field of new energy and materials. ...

AI Technical Summary

Problems solved by technology

[0004] Recently, Hu Liangbing's research group at the University of Maryland reported a method for preparing sodium metal anodes by infusing hot molten metal sodium into the voids of the carrier. This method is simple, efficient and controllable. The reported carriers mainly have porous channels. The carbonized wood material (Nano Letter, 2017, DOI: 10.1021 / acs.nanolett.7b01138), and the use of three-dimensional carbon material or foam porous material as a carrier to prepare sodium metal electrodes in the hot melt infusion method has not been reported

In addition, the deposition of sodium metal into the voids of three-dimensional carbon materials (carbon felt, carbon paper, carbon cloth) or foamed porous materials (copper foam and carbon foam) by electrodeposition has not yet been reported.

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