Li5Cr7Ti6O25/Multiwalled Carbon Nanotubes Composites with Fast Charge-Discharge Performance as Negative Electrode Materials for Lithium-Ion Batteries

In this study, Li5Cr7Ti6O25/ multiwalled carbon nanotubes (LCTO@MWCNTs) negative electrode materials were prepared via a sol-gel method. The physical and electrochemical properties of LCTO@MWCNTs (0, 3, 5 and 8 wt%) were systematically investigated. The results show that LCTO@MWCNTs (5 wt%) shows the best electrochemical properties in all samples. Cycled at 6 C, the LCTO@MWCNTs (5 wt%) composite delivers a charge capacity of 129.9 mA h g(-1), and the reversible capacity also achieves 123.8 mAh g(-1) after 400 cycles in the voltage range of 1.0-3.0V. Nevertheless, the pure LCTO only delivers a capacity of 91.2 mA h g(-1) and the capacity only reaches 84.9 mA h g(-1) after 400 cycles. The further study results indicate that the prepared LCTO@MWCNTs composites have higher electronic conductivity and lithium diffusion coefficient than the pure LCTO. (C) 2019 The Electrochemical Society.