Exploring the electrochemical properties of Cu-substituted Li2CoTi3O8 as anode material for lithium-ion batteries

Spinel Li 2 Co 1– x Cu x Ti 3 O 8 nanopowders ( x = 0, 0.25, 0.5 molar ratios) were synthesized via a sol–gel auto-combustion scheme. The preparation conditions like annealing temperature, Cu 2+ ion substituted on the crystallinity, microstructure and chemical composition were inspected using X-ray diffraction, X-rays photoelectron spectroscopy and field emission scanning electron microscopy. Furthermore, the electrochemical performance of the Li 2 Co 0.75 Cu 0.25 Ti 3 O 8 electrode towards the Li-ion battery was inspected via potentiodynamic cyclic voltammetry experiment, galvanostatic charge/discharge tests and electrochemical impedance spectroscopy. Li 2 Co 0.75 Cu 0.25 Ti 3 O 8 electrode exhibited a good reversible charge–discharge capacity with a primary discharge capacity of 527 mAh g −1 and excellent cycling stability of 98.75% coulombic efficiency.