Wei Shuangying, Serra Marco, Mourdikoudis Stefanos, Zhou Huaijuan, Wu Bing, Děkanovský Lukáš, Šturala Jiří, Luxa Jan, Tenne Reshef, Zak Alla, Sofer Zdeněk
Department of Inorganic Chemistry, University of Chemistry and Technology Prague, Technická 5, 166 28 Prague 6, Czech Republic.
Molecular Chemistry and Materials Science, Weizmann Institute of Science, Rehovot 7610001, Israel.
ACS Appl Mater Interfaces. 2022 Oct 19;14(41):46386-46400. doi: 10.1021/acsami.2c06295. Epub 2022 Oct 7.
Even though WS nanotubes (NTs-WS) have great potential as anode materials for lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs) thanks to their unusual layered structure, their conductivity and cycling stability are far from satisfactory. To tackle these issues, carbon-coated WS (NTs-WS@C) nanocomposites were prepared through a facile synthesis method that involved precipitating a carbon precursor (20% sucrose) on WS nanotubes, followed by annealing treatment under an argon environment. Thanks to the presence of highly conductive and mechanically robust carbon on the outer surface, NTs-WS@C nanocomposites show improved electrochemical performance compared with bare NTs-WS. After 60 cycles at 80 mA g current density, the cells display high capacities of 305 mAh g in LIBs and 152 mAh g in SIBs, respectively. As the current density increases to 600 mA g, it provides specific capacities of 209 and 115 mAh g, correspondingly. The enhanced electrochemical performance in LIBs and SIBs is primarily attributed to the synergistic effects of the tubular architecture of WS, carbon network and stable nanocomposite structure, which can effectively constrain volume variation during the metal ions intercalation/deintercalation processes.
尽管WS纳米管（NTs-WS）由于其独特的层状结构而具有作为锂离子电池（LIBs）和钠离子电池（SIBs）负极材料的巨大潜力，但其导电性和循环稳定性仍远不能令人满意。为了解决这些问题，通过一种简便的合成方法制备了碳包覆的WS（NTs-WS@C）纳米复合材料，该方法包括在WS纳米管上沉淀碳前驱体（20%蔗糖），然后在氩气环境下进行退火处理。由于在外表面存在高导电性和机械强度高的碳，NTs-WS@C纳米复合材料与裸露的NTs-WS相比，电化学性能有所改善。在80 mA g电流密度下循环60次后，LIBs电池和SIBs电池分别显示出305 mAh g和152 mAh g的高容量。当电流密度增加到600 mA g时，相应地提供209和115 mAh g的比容量。LIBs和SIBs中电化学性能的增强主要归因于WS的管状结构、碳网络和稳定的纳米复合结构的协同效应，这可以有效地限制金属离子嵌入/脱嵌过程中的体积变化。
