Self-supported formation of needlelike Co3O4 nanotubes and their application as lithium-ion battery electrodes

Abstract

A one-step self-supported topotactic transformation method for the formation of needlelike Co3O4 nanotubes and its potential application as lithium-ion battery electrodes are discussed. The loosely organized β-Co(OH)2 nanoplatelets undergo was treated with air to undergo a thermodynamically favorable oxidation reaction and the solid materials in the core region of the nanoneedles are evacuated through dissolution and reoxidation/deposition. High-resolution transmission electron microscopy (HRTEM) and scanning electron microscopy (SEM) were used for characterization of the nanoneedles surface. Time-dependent XRD patterns were monitored to study the topotactic transformation during the formation of nanotubes. The as-prepared needlelike nanotubes were shown to have improved cycle life and high rate capability with nearly 100% capacity retention for over 30 cycles.