Recently, the research team of Zhao Bangchuan, a researcher at the Functional Materials and Device Research Department of the Institute of Solid State Physics, Hefei Institute of Material Science, Chinese Academy of Sciences, has made new progress in the research on the performance control of MoS2 lithium/sodium ion battery electrode materials. Researchers have optimized the morphology of the material Designed and prepared a high-performance yarn spherical MoS2 electrode material. The related research results were titled Yarn ball-like MoS2 nanospheres coated by nitrogen-doped carbon for enhanced lithium and sodium storage performance and published in Journal of Power Sources. At present, both graphite and lithium titanate, which are negative electrode materials for commercial lithium-ion batteries, have shortcomings such as low theoretical specific capacity and poor rate performance, which cannot meet people's needs for high-energy/power density lithium-ion battery devices. Graphite electrodes are due to discharge during use. Safety issues caused by low voltage. In addition, when used as a negative electrode material for sodium ion batteries, it is difficult for graphite electrodes to form stable compounds with Na+, and their specific capacity is low. Therefore, it is of great significance to find materials that can be used as the negative electrode of lithium-ion batteries as well as the negative electrode of sodium-ion batteries. Most of the transition metal dichalcogenide compounds have a two-dimensional graphene-like layered structure and a large interlayer spacing, which is beneficial to the transmission of Li+ and Na+ ions. Taking MoS2 as an example, its layer spacing is 6.15 angstroms. When used as a lithium battery or sodium battery negative electrode, its theoretical specific capacity is as high as 670 mAh g-1, which has great application potential in both lithium battery and sodium battery fields. However, due to its poor conductivity and serious volume changes during ion insertion/extraction, its electrochemical performance is affected and its practical application is limited. To this end, researchers used the simple, low-cost and environmentally friendly polyvinylpyrrolidone (PVP) assisted hydrothermal method to prepare a nitrogen-doped carbon-coated yarn spherical MoS2 nanostructure composite MoS2-PVP@NC, When the material is used as the negative electrode of a sodium ion battery, it shows excellent performance. The specific capacity after 200 cycles at a current density of 1 A g-1 is 410.2 mAh g-1, and a high current density of 10 A g-1 The lower specific capacity is 352.1 mAh g-1. In addition, MoS2-PVP@NC also shows excellent lithium battery performance. After 300 cycles at a current density of 1 A g-1, its specific capacity is as high as 607.1 mAh g-1. The specific capacity can still be maintained at 356.0 mAh g-1. Studies have found that the excellent performance of the material is mainly derived from the synergy between its yarn spherical structure and the nitrogen-doped carbon coating layer. The yarn spherical nanostructure can enhance the structural stability of the material, while the nitrogen-doped carbon coating layer can further improve The structural stability and conductivity of the material, so the MoS2-PVP@NC composite material can show excellent lithium/sodium storage performance. The research work is supported by the National Key Research and Development Program and the National Natural Science Foundation of China and the Joint Fund Project of the Great Scientific Installations.
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Figure 1. Synthetic schematic diagram of MoS2-PVP@NC composite material
Figure 2. Lithium battery performance of MoS2-PVP@NC composite
Figure 3. Sodium electrical properties of MoS2-PVP@NC composite
Hefei Research Institute prepared high-performance yarn spherical MoS2 electrode material