Photorechargeable Lead-Free Perovskite Lithium-Ion Batteries Using Hexagonal Cs<sub>3</sub>Bi<sub>2</sub>I<sub>9</sub> Nanosheets.
basic_science · Level V
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- Record sourced from PubMed, PMID 34133191.
- Also identified by DOI 10.1021/acs.nanolett.1c01000.
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Abstract
Materials that enable bifunctional operation in harvesting and storing energy are currently in high demand, due to their potential to efficiently use renewable solar energy. Here, we present a lead-free, all-inorganic, bismuth-based perovskite halide, which acts as a photoelectrode that can harvest energy under illumination without the assistance of an external load in a lithium-ion battery. The battery performance is shown using three different current collectors: copper, fluorine-doped tin oxide (FTO) and carbon felt (CF) to exhibit the electrode's function as a normal coin cell, as a basic photobattery with a transparent collector to elucidate its functional mechanism, and as an optimized photobattery displaying competitive metrics with other photobatteries obtaining a photo conversion efficiency of ∼0.43% for the first discharge. Upon discharging under illumination, we observed an increase in capacity from 410 to 975 mA·h·g<sup>-1</sup>. Further exploration in anode structure and design provides a path toward more efficient photobatteries.