In this paper we report a solid state lithium ion battery based on nanostructured titanium oxide (TiO2) anode, olivine lithium iron phosphate (LiFePO4) cathode and polyethylene oxide (PEO)-based electrolyte. The battery evidences average working voltage of 1.8 V and specific capacity of 150 mA h g−1. The solid cell configuration is characterized by enhanced electrochemical properties, high safety level and remarkable environmental compatibility. The preliminary results here reported suggest that the system may be suitable to be used as alternative energy storage system for powering safe and environmental friendly hybrid and electric vehicles.