3D Carbiyne Nanospheres Boosting Excellent Lithium and Sodium Storage Performance

Reasonable design of electrode materials with specific morphology and structure can efficiently improve the metal ions storage and transmission properties of metal ion batteries. Here the preparation of spirobifluorene-based three-dimensional carbiyne nanosphere (SBFCY-NS) that is composed of spirobifluorene (SBF) and alkyne bonds is reported. Benefiting from the rigid spatial structure of SBF, numerous precursors are coupled through the connection of acetylene bonds, extending to form solid nanospheres. Abundant storage spaces and convenient multi-directional transmission paths for metal ions are available inside the three-dimensional (3D) carbiyne structure. Thus, SBFCY-NS is applied as efficient anode for lithium-ion battery and sodium-ion battery. The good stability of SBFCY-NS-based electrode and its improved Coulombic efficiency can be attributed to the special morphology of nanospheres, which can easily form thin and stable solid electrolyte interface film on the surface. Those results further promote the preparation of spherical carbon-based materials with abundant pores that can be applied in the field of electrodes.

Automated summary

Reasonably designed electrode materials with specific morphology and structure can enhance metal ion batteries' storage and transmission properties. In this study, a three-dimensional carbiyne nanosphere based on spirobifluorene was prepared, providing abundant storage spaces and convenient transmission paths for metal ions. The special morphology of the nanospheres contributes to the good stability and improved Coulombic efficiency of the electrode, showing potential for application in electrode materials with abundant pores.