Engineering dual-crystal configurations in perovskite oxides boosts electrocatalysis of lithium-oxygen batteries

• Published in: Journal of colloid and interface science Vol. 657; pp. 384 - 392
• Main Authors: Chen, Jiahao, Li, Runjing, Li, Bin, Hu, Anjun, He, Miao, Zhou, Bo, Fan, Yining, Yan, Zhongfu, Pan, Yu, Yang, Borui, Li, Ting, Li, Kun, Li, Baihai, Long, Jianping
• Format: Journal Article
• Language: English
• Published: United States 01.03.2024
• Subjects: Cathode catalysts; Structure engineering; Perovskite metal oxides; Li–O batteries; Structure-property relationship
• ISSN: 0021-9797; 1095-7103
• DOI: 10.1016/j.jcis.2023.11.179

Sculpting crystal configurations can vastly affect the charge and orbital states of electrocatalysts, fundamentally determining the catalytic activity of lithium-oxygen (Li-O ) batteries. However, the crucial role of crystal configurations in determining the electronic states has usually been neglected and needs to be further examined. Herein, we introduce orthorhombic and trigonal system into 0.5La Sr MnO -0.5LaMn Co O (LSMCO) by selectively incorporating Sr and Co cations into the LaMnO framework during the sol-gel process, which is used to explore the relationship among crystal structure, electronic states and catalytic performance. Based on both experimental and theoretical calculations, the dual-crystal configurations induce strong lattice distortion, which promotes MnO octahedra vibration and shortened MnO bonds. Furthermore, the suppressed Jahn-Teller distortion weakens the orbital arrangement and accelerates the charge delocalization, leading to the conversion of Mn to Mn and optimized electronic states. Ultimately, this resulted in optimized Mn 3d and O 2p orbital hybridization and activated lattice oxygen function, leading to a significant improvement in electrocatalytic activity. The LSMCO catalyzed Li-O battery achieves enhanced discharge capacity of 14498.7 mAh/g and cycling stability of 258 cycles. This work highlights the significance of inner structure and presents a feasible strategy for engineering crystal configurations to boost electrocatalysis of Li-O batteries.