Composite NiCo2O4@CeO2 Microsphere as Cathode Catalyst for High‐Performance Lithium–Oxygen Battery

• DOI: 10.1002/advs.202200523
• Publication Date: 2022-04-27T09:13:30Z
• Authors: Yuanhui Wu; Haoran Ding; Tianlun Yang; Yongji Xia; Hongfei Zheng; Qiulong Wei; Jiajia Han,; Dong‐Liang Peng; Guanghui Yue
• Keywords: Overpotential; Oxygen evolution

The large overpotential and poor cycle stability caused by inactive redox reactions are tough challenges for lithium-oxygen batteries (LOBs). Here, a composite microsphere material comprising NiCo2 O4 @CeO2 is synthesized via hydrothermal approach followed an annealing processing, which acted as high performance electrocatalyst LOBs. unique microstructured catalyst can provide enough catalytic surface to facilitate the barrier-free transport of oxygen well lithium ions. In addition, special porous nanoneedles structure effectively accelerate electrolyte penetration reversible formation decomposition process Li2 O2 , while introduction CeO2 increase vacancies optimize electronic thereby enhancing electron whole electrode. This kind cathode reduce only 1.07 V with remarkable cycling 400 loops under 500 mA g-1 . Based on density functional theory calculations, origin enhanced electrochemical clarified from perspective reaction kinetics. work demonstrates efficiency confirms contribution current design concept development LOBs materials.