Cesium Lead Bromide Perovskite-Based Lithium-Oxygen Batteries.
basic_science · Level V
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- Record sourced from PubMed, PMID 34044536.
- Also identified by DOI 10.1021/acs.nanolett.1c01631.
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Abstract
The main challenge for lithium-oxygen (Li-O<sub>2</sub>) batteries is their sluggish oxygen evolution reaction (OER) kinetics and high charge overpotentials caused by the poorly conductive discharge products of lithium peroxide (Li<sub>2</sub>O<sub>2</sub>). In this contribution, the cesium lead bromide perovskite (CsPbBr<sub>3</sub>) nanocrystals were first employed as a high-performance cathode for Li-O<sub>2</sub> batteries. The battery with a CsPbBr<sub>3</sub> cathode can exhibit the lowest charge overpotential of 0.5 V and the best cycling performance of 400 cycles among all the reported perovskite-based Li-O<sub>2</sub> cells, which represents a new benchmark. Most importantly, the density functional theory (DFT) calculations further prove that the rate limitation step during OER processes is the decomposition of LiO<sub>2</sub> to form O<sub>2</sub> and Li<sup>+</sup>, and the weak adsorption strength between CsPbBr<sub>3</sub> surfaces and LiO<sub>2</sub> results in a low charge overpotential for the CsPbBr<sub>3</sub>-based Li-O<sub>2</sub> battery. This work first demonstrates the good potential of CsPbBr<sub>3</sub> for application in metal-air batteries.