Characterization of all-solid-state Li/LiPONB/TiOS microbatteries produced at the pilot scale

All-solid-state Li/LiPONB/TiOS microbatteries were manufactured at the pilot scale on silicon substrate. In a first attempt, the characterization of the active materials constituting the microbattery was achieved in order to determine their accurate composition, structure and morphology. Finally, a thorough electrochemical characterization was carried out on all-solid-state cells. Excellent performances were noted in terms of cycle life (with more than 1000 cycles), efficiency and self-discharge (less than 5% per year). In addition, the positive electrode highlighted a high volumetric capacity close to 90 μAh cm−2 μm−1 when cycled at 100 μA cm−2 between 1 V and 3 V vs. Li+/Li.

► All-solid-state microbatteries produced at the pilot scale. ► Titanium oxysulfide positive electrode. ► LiPONB solid electrolyte. ► High volumetric capacity for the microbattery close to 90 μAh cm−2 μm−1. ► Excellent cycling stability, very low self-discharge and high efficiency.