High Power Nanocomposite TiS2 Cathodes for All-Solid-State Lithium Batteries

To deploy solid-state Li batteries in next-generation vehicles, it is essential to develop electrodes with durability, high energy and high power. Here we report on nanostructured composite cathode materials that enable solid-state Li batteries to cycle with durable high energy and high rate performance. Particle size of TiS 2 is reduced by planetary ball-milling to enhance performance of nanocomposite cathodes in solid-state Li batteries. The better utilization of active material and fast kinetics resulting from the size reduction of TiS 2 allow for highly reversible capacity in both room temperature and elevated temperature batteries. High power all-solid-state batteries have been constructed with nano-sized TiS 2 and demonstrated high power density over 1000 W kg −1 for over 50 cycles, with a maximum power density of ∼ 1400 W kg −1 . Galvanostatic intermittent titration technique and electrochemical impedance spectroscopy are employed in order to explain the extremely high rate capability of nanostructured TiS 2 nanocomposite.