Self-charging integrated energy modules: A record photoelectric storage efficiency of 14.6 %

초록

As portable electronic devices typically rely on rechargeable batteries, it inherently limits their operational time. A promising approach to overcome this limitation is the integration of energy conversion and storage devices, thereby enabling semi-permanent usage of portable electronics. A novel integrated energy module is presented, which demonstrates a high photoelectric storage efficiency (PSE). This module comprises a perovskite solar cell (PSC) as the energy converter and a lithium‑sulfur battery (LSB) as the storage unit. In our configuration, four series-connected PSCs provide a high open-circuit voltage (VOC) of 4.5 V and a conversion efficiency of 16.2 % with a 1 cm2 area. The PSC-LSB module achieves an unprecedented PSE of 14.6 % among LSB-based integrated energy modules, marked by a significant output voltage of 2.1 V at a current density of 0.16 A/g. Additionally, we report an 87 % retention capacity for the PSC-LSB module, which utilizes a lithium metal anode and sulfur-composited porous carbon fibers cathode. This module maintains stable performance over 200 cycles. The superior characteristics of the PSC-LSB energy integrated module can be attributed to the efficient engineering of each PSC and LSB device, as well as effective metal patterning connections on the common electrode/substrate. © 2024 Elsevier Ltd

키워드