A composite sulfur electrode material, its preparation method and application

By growing one-dimensional carbon nanotubes on the surface of two-dimensional materials and embedding sulfur, the problems of poor conductivity and polysulfide shuttle effect of two-dimensional transition metal compounds in metal-sulfur batteries are solved, and the efficient electrochemical performance and structural stability of the battery are achieved.

CN115548326BActive Publication Date: 2025-08-01QILU UNIVERSITY OF TECHNOLOGY (SHANDONG ACADEMY OF SCIENCES)
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Patent Information

Application Number
CN202211253564.7
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-10-13
Publication Date
2025-08-01
Estimated Expiration
2042-10-13

AI Technical Summary

Technical Problem

The existing two-dimensional transition metal compounds have poor conductivity in metal-sulfur batteries, and there are problems with polysulfide shuttle effect and volume expansion during charging and discharging, which affects the cycle stability and capacity utilization of the battery.

Method used

One-dimensional carbon nanotubes are grown on the surface of two-dimensional materials, and sulfur is embedded in their gaps and hollow structures, limiting polysulfides through physical adsorption and chemical bonding, promoting electron and ion transport, and alleviating volume changes.

Benefits of technology

It improves the conductivity and cyclic stability of the battery, suppresses the shuttle effect of polysulfides, and enhances the long-term durability and electrochemical performance of the battery.

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Abstract

The present invention belongs to the field of electrochemical energy storage, and relates to a composite sulfur electrode material, a preparation method thereof, and an application thereof. The composite sulfur electrode material uses a two-dimensional lamellar material as a matrix, and one-dimensional carbon nanotubes are in-situ grown on metal sites to form a two-dimensional-one-dimensional composite material. Sulfur is coated on the inner and outer walls of the carbon nanotubes and embedded in the gaps formed by the intersection of the carbon nanotubes. The two-dimensional-one-dimensional composite material is a unified whole with one-dimensional carbon nanotubes growing on the two-dimensional lamella. The two-dimensional lamellar material is a single-layer or multi-layer lamellar compound, preferably a metal compound; the one-dimensional carbon nanotube is a hollow tubular structure with excellent electrical conductivity. The two-dimensional-one-dimensional composite material provided by the present invention can improve its electrical conductivity while ensuring the excellent performance of the two-dimensional lamellar material when used as a sulfur carrier, promote the transmission of electrons / ions, and provide sufficient space to load sulfur and relieve the volume expansion during charge and discharge, thereby optimizing its electrochemical performance in the field of metal-sulfur batteries.
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