Journal Article

FZJ-2019-03299

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Truncated Octahedral High-Voltage Spinel LiNi 0.5 Mn 1.5 O 4 Cathode Materials for Lithium Ion Batteries: Positive Influences of Ni/Mn Disordering and Oxygen Vacancies

Liu, H. ; Zhang, X. ; He, X.FZJ* ; Senyshyn, A. ; Wilken, A. ; Zhou, D. ; Fromm, O. ; Niehoff, P. ; Yan, B.FZJ* ; Li, J.FZJ* ; Muehlbauer, M. ; Wang, J. ; Schumacher, G. ; Paillard, E.FZJ* ; Winter, M.FZJ* ; Li, J. (Corresponding author)FZJ*

2018
Electrochemical Soc. Pennington, NJ

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Please use a persistent id in citations: doi:10.1149/2.1241809jes

Abstract: Micron-sized truncated octahedral LiNi0.5Mn1.5O4 (LNMO) samples with different degrees of Ni/Mn disordering have been obtained by controlling the synthesis conditions, such as calcination atmosphere (O2 and air), cooling rate or additional annealing step. The influences of Ni/Mn disordering on the physical properties and electrochemical performance of the truncated octahedral LNMO samples have been systematically investigated. The analyses of thermogravimetry, X-ray photoelectron spectroscopy, X-ray diffraction, powder neutron diffraction, Raman spectroscopy and X-ray absorption spectroscopy reveal that the occurrence and degree of Ni/Mn disordering are closely related with the formation of oxygen vacancies and presence of Mn3+. Slow cooling rate and post-annealing can result in low degrees of Ni/Mn disordering and oxygen vacancies. Electrochemical measurements show that Ni/Mn disordering and oxygen vacancies have no obvious effect on the rate capability since all LNMO samples share a truncated octahedral morphology with the exposed {100} surfaces. However, they play significant roles in improving long-term cycling stability, especially at the elevated temperature of 60°C. This work suggests that the electrochemical performance of LNMO with optimized truncated morphology can be further enhanced through tuning the degrees of Ni/Mn disordering and oxygen vacancies.

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Contributing Institute(s):

1. Helmholtz-Institut Münster Ionenleiter für Energiespeicher (IEK-12)

Research Program(s):

1. 131 - Electrochemical Storage (POF3-131) (POF3-131)

Appears in the scientific report 2019

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Database coverage:
; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

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