Long-Lasting Nb₂O₅-Based Nanocomposite Materials for Li-Ion Storage

Advanced nanostructured hybrid materials can help us overcome the electrochemical performance limitations of current energy storage devices. In this study, three-dimensional porous carbon nanowebs (3D-CNWs) with numerous included orthorhombic Nb₂O₅ (T-Nb₂O₅) nanoparticles were fabricated using a microbe-derived nanostructure. The 3D-CNW/T-Nb₂O₅ nanocomposites showed an exceptionally stable long-term cycling performance over 70 000 cycles, a high reversible capacity of ∼125 mA h g^-1, and fast Li-ion storage kinetics in a coin-type two-electrode system using Li metal. In addition, energy storage devices based on the above nanocomposites achieved a high specific energy of ∼80 W h kg^-1 together with a high specific power of ∼5300 W kg^-1 and outstanding cycling performance with ∼80% capacitance retention after 35 000 cycles.