Bucket effect on high-performance Li–O2 batteries based on P-doped 3D NiO microspheres with conformal growth of discharge products. Issue 46 (1st November 2022)

• Record Type: Journal Article
• Authors: Long, Yuxin; Zhang, Zidong; Zhao, Lanling; Zeng, Qingxi; Li, Qiang; Wang, Jun; Li, Deyuan; Xia, Qing; Liu, Yao; Han, Xue; Zhou, Zhaorui; Li, Yebing; Zhang, Yiming; Chou, Shulei
• Is Part Of: Journal of materials chemistry. Volume 10:Issue 46(2022)
• Page Start: 24538
• Page End: 24551
• Publication Date: 2022-11-01
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d2ta07061h
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : The introduction of P heteroatoms into NiO constructed abundant Ni–P coordination groups as emerging catalytic sites, which improved adsorption capacity to the intermediate product LiO2, ensuring effective formation/decomposition of conformal Li2 O2 . Abstract : Rechargeable Li–O2 batteries are a remarkable technology for electrical energy conversion and storage owing to their exceptionally high theoretical energy density versus that of commercial Li-ion batteries. However, this promising system still suffers from limited practical energy density, poor cycling stability, severe side reactions, high overpotentials, etc. In this work, NiO materials with different P doping contents were synthesized by hydrothermal and subsequent annealing methods, which served as cathode catalysts for Li–O2 batteries. The introduction of P heteroatoms effectively rationalized the charge distribution on the P–NiO surfaces, enabling remarkable advancement of the reaction kinetics. This is because a large number of Ni–P coordination groups were produced as emerging catalytic sites, thus greatly reducing the Gibbs energy barriers during cycling. P–NiO also realizes superior electrochemical performance of Li–O2 batteries by modulating the affinity for intermediates and regulating the formation/decomposition of conformal thin-film Li2 O2 in discharge and charge processes. As expected, the P–NiO cathode delivered a remarkable electrochemical performance for Li–O2 electrocatalysis. This research contributes to an in-depth understanding of the relationship between electronic structures on oxygen electrocatalyst surfaces and electrocatalytic activities in Li–O2 batteries.