Journal Article

FZJ-2021-03252

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Electronic Structure Engineering of Honeycomb Layered Cathode Material for Sodium‐Ion Batteries

Voronina, N. ; Kim, H. J. ; Konarov, A. ; Yaqoob, N.FZJ* ; Lee, K.-S. ; Kaghazchi, P. (Corresponding author)FZJ* ; Guillon, O.FZJ* ; Myung, S.-T. (Corresponding author)Extern*

2021
Wiley-VCH Weinheim

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Please use a persistent id in citations: http://hdl.handle.net/2128/30851  doi:10.1002/aenm.202003399

Abstract: In this work, the rational design of O′3-type Na[Ni2/3−xCoxSb1/3]O2, a solid solution of Na[Ni2/3Sb1/3]O2–Na[Co2/3Sb1/3]O2, is introduced. Because of the difficulty of the Co3+/2+ redox reaction, the electronic structures of Na[Ni2/3−xCoxSb1/3]O2 compounds are engineered to build electroconducting networks in the oxide matrix through electrochemical oxidation of Co2+ to Co3+, after which the formed Co3+ does not participate in the electrochemical reaction but improves the electrical conductivity in the structure. Density functional theory calculations reveal a reduced bandgap energy after the formation of Co3+ during desodiation of Na1−y[Ni2/3−xCoxSb1/3]O2. Using the oxidized Co3+ species while improving the electrical conductivity, the Na[Ni2/3−xCoxSb1/3]O2 (x = 1/6) electrode exhibits excellent cyclability for 1000 cycles with ≈72.5% capacity retention at 2C (400 mA g−1) and activity even at 50C (10 A g−1) in Na cells. Operando X-ray diffraction and ex situ X-ray absorption near-edge structure investigations reveal suppressed lattice variations upon charge and discharge compared with those of Na[Ni2/3Sb1/3]O2 achieved by the presence of the electrochemical-driven Co3+ in the structure. These findings offer a new strategy for the development of cathode materials for sodium-ion batteries, providing important insight into their structural transformations and the electronic nature of advanced cathode materials.

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Contributing Institute(s):

1. Werkstoffsynthese und Herstellungsverfahren (IEK-1)
2. JARA-ENERGY (JARA-ENERGY)

Research Program(s):

1. 1221 - Fundamentals and Materials (POF4-122) (POF4-122)

Appears in the scientific report 2021

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Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; DEAL Wiley ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 25 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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