Premium
Exposing {010} Active Facets by Multiple‐Layer Oriented Stacking Nanosheets for High‐Performance Capacitive Sodium‐Ion Oxide Cathode
Author(s) -
Xiao Yao,
Wang PengFei,
Yin YaXia,
Zhu YanFang,
Niu YuBin,
Zhang XuDong,
Zhang Jienan,
Yu Xiqian,
Guo XiaoDong,
Zhong BenHe,
Guo YuGuo
Publication year - 2018
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201803765
Subject(s) - materials science , cathode , stacking , anode , electrochemistry , oxide , chemical engineering , electrode , capacitive sensing , x ray absorption spectroscopy , nanotechnology , absorption spectroscopy , chemistry , physics , organic chemistry , engineering , metallurgy , quantum mechanics , computer science , operating system
Abstract As one of the most promising cathodes for rechargeable sodium‐ion batteries (SIBs), O3‐type layered transition metal oxides commonly suffer from inevitably complicated phase transitions and sluggish kinetics. Here, a Na[Li 0.05 Ni 0.3 Mn 0.5 Cu 0.1 Mg 0.05 ]O 2 cathode material with the exposed {010} active facets by multiple‐layer oriented stacking nanosheets is presented. Owing to reasonable geometrical structure design and chemical substitution, the electrode delivers outstanding rate performance (71.8 mAh g −1 and 16.9 kW kg −1 at 50C), remarkable cycling stability (91.9% capacity retention after 600 cycles at 5C), and excellent compatibility with hard carbon anode. Based on the combined analyses of cyclic voltammograms, ex situ X‐ray absorption spectroscopy, and operando X‐ray diffraction, the reaction mechanisms behind the superior electrochemical performance are clearly articulated. Surprisingly, Ni 2+ /Ni 3+ and Cu 2+ /Cu 3+ redox couples are simultaneously involved in the charge compensation with a highly reversible O3–P3 phase transition during charge/discharge process and the Na + storage is governed by a capacitive mechanism via quantitative kinetics analysis. This optimal bifunctional regulation strategy may offer new insights into the rational design of high‐performance cathode materials for SIBs.