According to foreign media reports, the University of Texas at Dallas uses 2D molybdenum disulfide (MoS2) as a protective layer for lithium metal battery anodes, significantly improving the performance of lithium-sulfur batteries.
The researchers used molybdenum disulfide to improve the stability of lithium electrodeposition (Li electrodeposition) and inhibit the formation of dendrite nucleation sites.
The researchers used lithium coated with molybdenum disulfide and 3D carbon nanotube-sulfur as the anode and cathode of the lithium-sulfur battery, respectively, with a specific energy density of ~589 Wh/. Kg, after 1200 charge and discharge at 0.5°C, the Coulombic efficiency is ~98%.
This method or will achieve high energy density, enhance the safety of lithium metal batteries. Compared to lithium-ion batteries, lithium-sulfur batteries have many advantages, relatively inexpensive, light weight, and energy storage is nearly twice that of lithium-ion batteries, and Environmental protection is better.
However, sulfur is a poorly performing electrical conductor that becomes less stable only by charging and discharging several times. Another reason why lithium-sulfur batteries have not become mainstream is due to electrode decomposition ( Electrodes breaking down)
The original molybdenum metal factory is often used to increase the hardness of steel and hardening, when it is combined with two sulfur atoms, the resulting material can be used to adjust the thickness of the coating. The researchers found that the material can enhance the sulfur Stability and electrical conductivity, so as to obtain greater energy density, to promote the commercialization of lithium-sulfur batteries.
The study was funded by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the National Research Foundation of Creative Materials Discovery Program.
