Photo-rechargeable all-solid-state lithium − sulfur batteries based on perovskite indoor photovoltaic modules

Photovoltaic technologies for indoor energy harvesting have attracted considerable attention because of the unique power requirements associated with the Internet of Things. However, intermittent power supplies, low light intensities, and security issues are barriers to the development of indoor photovoltaic technology. Herein, we demonstrate an all-solid-state photo-rechargeable battery system for indoor energy harvesting and storage based on an all-inorganic CsPbI2Br perovskite solar cell module and an all-solid-state lithium − sulfur battery. This energy conversion and storage unit exhibits an excellent overall energy conversion and storage efficiency of 11.2 % under LED illumination, as well as a high electrochemical storage capacity of 1585.3 mAh g−1. Moreover, the unit also shows good safety and stability after 200 h of photo-charge and galvanostatic discharge cycles due to the thermal stability of the solid-state CsPbI2Br perovskite and sulfide electrolyte. Even in the thermal aging tests at 60°C and 90°C, the photo-rechargeable battery still delivers superior high and steady performance for 200 h.