Effect of Y-doped TiO2(B)/SnO2 1D structured nanocomposite on the performance and capacity of lithium-ion batteries

Abstract

Because traditional graphite anode for Lithium-ion batteries (LIBs) has low coulombic efficiency, high irreversible capacity and large volume expansion which can no longer satisfy the requirements of high-performance batteries. This article therefore presented the development of an anode material based on structural design to enhance its properties. One-dimension structured nanocomposites of yttrium-doped TiO2(B) nanowires/ SnO2 nanotubes were synthesised at various yttrium concentrations via hydrothermal method. Phase composition, crystal structure, morphologies, and electrochemical properties were evaluated to study the effects of the dopant on performance and capacity of the LIBs. XRD showed the modification in crystalline size and lattice parameters when yttrium was introduced. Electrochemical properties were markedly enhanced by the yttrium-doped nanocomposites, especially for the one with 0.5%mole yttrium (TSY50). The TSY50 offered the highest diffusion coefficient of 2.34×10-10 cm2 /s, reduced the Li-ion diffusion length and the cell resistance, improved the specific capacity, cycle performance and capacity retention, as demonstrated by cycling tests. The prepared yttrium-doped nanocomposite could be considered as a promising material for its application as an anode in LIBs.