Biomass-Mediated Synthesis of Cu-Doped TiO2 Nanoparticles forImproved-Performance Lithium-Ion Batteries

摘要

Pure TiO2 and Cu-doped TiO2 nanoparticles are synthesized by thebiomediated green approach using the Bengal gram bean extract. The extract containingbiomolecules acts as capping agent, which helps to control the size of nanoparticles andinhibit the agglomeration of particles. Copper is doped in TiO2 to enhance the electronicconductivity of TiO2 and its electrochemical performance. The Cu-doped TiO2nanoparticle-based anode shows high specific capacitance, good cycling stability, andrate capability performance for its envisaged application in lithium-ion battery. Amongpure TiO2, 3% Cu-doped TiO2, and 7% Cu-doped TiO2 anode, the latter shows thehighest capacity of 250 mAh g?1 (97.6% capacity retention) after 100 cycles and morethan 99% of coulombic efficiency at 0.5 A g?1 current density. The improvedelectrochemical performance in the 7% Cu-doped TiO2 is attributed to the synergeticeffect between copper and titania. The results reveal that Cu-doped TiO2 nanoparticlesmight be contributing to the enhanced electronic conductivity, providing an efficientpathway for fast electron transfer.