Zhou Yin, Gu Qianfeng, Li Yiju, Tao Lu, Tan Hao, Yin Kun, Zhou Jinhui, Guo Shaojun
School of Materials Science and Engineering, Peking University, Beijing 100871, China.
Department of Materials Science and Engineering, City University of Hong Kong, Tat Chee Avenue 83, Kowloon, China.
Nano Lett. 2021 Jun 9;21(11):4861-4867. doi: 10.1021/acs.nanolett.1c01631. Epub 2021 May 27.
The main challenge for lithium-oxygen (Li-O) batteries is their sluggish oxygen evolution reaction (OER) kinetics and high charge overpotentials caused by the poorly conductive discharge products of lithium peroxide (LiO). In this contribution, the cesium lead bromide perovskite (CsPbBr) nanocrystals were first employed as a high-performance cathode for Li-O batteries. The battery with a CsPbBr 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 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 to form O and Li, and the weak adsorption strength between CsPbBr surfaces and LiO results in a low charge overpotential for the CsPbBr-based Li-O battery. This work first demonstrates the good potential of CsPbBr for application in metal-air batteries.
锂氧（Li-O）电池面临的主要挑战在于其析氧反应（OER）动力学缓慢，以及过氧化锂（LiO₂）导电性差的放电产物导致的高充电过电位。在本研究中，溴化铯铅钙钛矿（CsPbBr₃）纳米晶体首次被用作Li-O电池的高性能阴极。在所有已报道的基于钙钛矿的Li-O电池中，具有CsPbBr₃阴极的电池可展现出最低的0.5 V充电过电位以及400次循环的最佳循环性能，这代表了一个新的基准。最重要的是，密度泛函理论（DFT）计算进一步证明，OER过程中的速率限制步骤是LiO₂分解形成O和Li，并且CsPbBr₃表面与LiO₂之间的弱吸附强度导致基于CsPbBr₃的Li-O电池具有较低的充电过电位。这项工作首次证明了CsPbBr₃在金属空气电池应用中的良好潜力。
