Effect of carbon and N-doped carbon nanomaterials on the electrochemical performance of lithium titanate-based composites

摘要: Abstract The composite nanomaterials based on hydrothermally synthesized Li4Ti5O12 and carbon nanotubes (CNTs) or nanoflakes, including N-doped ones were prepared. composites investigated by X-ray powder diffraction, TEM, SEM, Raman spectroscopy, BET, dc-measurements, galvanostatic charge-discharge tests, cyclic voltammetry electrochemical impedance spectroscopy. Carbon nanomaterial addition provides the formation of a highly conductive 3D network leading to significant increase in electrical conductivity excellent performance at high rates. At current density 6400 mA/g (~37C), reversible discharge capacities its with CNTs are 60, 92, 96 mAh/g, respectively. They exhibit remarkable long-term cycling stability: less than 0.034%, 0.013% 0.005% loss per cycle over 500 cycles, results obtained measurements suggest interaction between polar fragments surface.