Energetic-Materials-Driven Synthesis of Graphene-Encapsulated Tin Oxide Nanoparticles for Sodium-Ion Batteries

Materials

Tingting Xu¹  Lijuan Hou¹  Min Yang²  Jinxu Liu²  Shukui Li²  Chuan He²  Zhihua Zhuang²  Yingchun Wang² 

[1] Key Laboratory of Materials Physics of Ministry of Education, Zhengzhou University, Zhengzhou 450052, China;School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China;

关键词: sodium-ion batteries;    graphene;    core-shell structure;    energetic materials;    tin oxide;    nanomaterials;   

DOI  :  10.3390/ma14102550

来源: DOAJ

【 摘 要 】

By evenly mixing polytetrafluoroethylene-silicon energetic materials (PTFE-Si EMs) with tin oxide (SnO₂) particles, we demonstrate a direct synthesis of graphene-encapsulated SnO₂ (Gr-SnO₂) nanoparticles through the self-propagated exothermic reaction of the EMs. The highly exothermic reaction of the PTFE-Si EMs released a huge amount of heat that induced an instantaneous temperature rise at the reaction zone, and the rapid expansion of the gaseous SiF₄ product provided a high-speed gas flow for dispersing the molten particles into finer nanoscale particles. Furthermore, the reaction of the PTFE-NPs with Si resulted in a simultaneous synthesis of graphene that encapsulated the SnO₂ nanoparticles in order to form the core-shell nanostructure. As sodium storage material, the graphene-encapsulated SnO₂ nanoparticles exhibit a good cycling performance, superior rate capability, and a high initial Coulombic efficiency of 85.3%. This proves the effectiveness of our approach for the scalable synthesis of core-shell-structured graphene-encapsulated nanomaterials.

【 授权许可】

Unknown