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 TiS2 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 TiS2 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 TiS2 and demonstrated high power density over 1000 W kg(-1) for over 50 cycles, with a maximum power density of similar to 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 TiS2 nanocomposite. (C) 2011 The Electrochemical Society. [DOI: 10.1149/2.017112jes] All rights reserved.