Binder-free scribbled anodes using hollow Si nanotubes for efficient lithium storage

Abstract

One-dimensional silicon nanotubes (SiNTs) are a promising anode for Li-ion batteries (LIBs). However, the requirement of reactive chemicals and high temperature for the growth of vertically aligned SiNT hinders practical deployment. Herein, we demonstrate a soft template-assisted synthesis of one-dimensional hollow silica using Mg(OH)₂ nanorods as a substrate via hydrothermal treatment of Na₂SiO₃ and Triton-X-100. The h-SiNTs obtained thereupon by magnesiothermic reduction and acid leaching of h-SiO₂@Mg(OH)₂ were scribbled directly on copper foil to fabricate a binder- and conductive-agent-free anode outperforming the electrochemical performance of conventional slurry-based Si anodes in Li-ion half-cells.