Characterisation of LTO // NMC Batteries Containing Ionic Liquids or Carbonates after Cycling and Overcharge

Electrochemical performances in cycling and overcharge of Li4Ti5O12 (LTO) // LiNi1/3Mn1/3Co1/3O2 (NMC) batteries with two ionic liquid-based electrolytes and a commercial carbonate were investigated at 60 °C. These experiments were performed in coin and pouch cells allowing the full characterization of decomposition products and electrodes surface by SEM, XRD and XPS techniques, after cycling and overcharge.