Journal Article

FZJ-2018-00113

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Monitoring local redox processes in LiNi 0.5 Mn 1.5 O 4 battery cathode material by in operando EPR spectroscopy

Niemöller, A. (Corresponding author)FZJ*RWTH* ; Jakes, P.FZJ* ; Eurich, S.FZJ* ; Paulus, A.FZJ*RWTH* ; Kungl, H.FZJ* ; Eichel, R.-A.FZJ*RWTH* ; Granwehr, J.FZJ*RWTH*

2018
American Institute of Physics Melville, NY

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Please use a persistent id in citations: http://hdl.handle.net/2128/18290  doi:10.1063/1.5008251

Abstract: Despite the multitude of analytical methods available to characterize battery cathode materials, identifying the factors responsible for material aging is still challenging. We present the first investigation of transient redox processes in a spinel cathode during electrochemical cycling of a lithium ion battery by in operando electron paramagnetic resonance (EPR). The battery contains a LiNi0.5Mn1.5O4 (LNMO) spinel cathode, which is a material whose magnetic interactions are well understood. The evolution of the EPR signal in combination with electrochemical measurements shows the impact of Mn3+ on the Li+ motion inside the spinel. Moreover, state of charge dependent linewidth variations confirm the formation of a solid solution for slow cycling, which is taken over by mixed models of solid solution and two-phase formation for fast cycling due to kinetic restrictions and overpotentials. Long-term measurements for 480 h showed the stability of the investigated LNMO, but also small amounts of cathode degradation products became visible. The results point out how local, exchange mediated magnetic interactions in cathode materials are linked with battery performance and can be used for material characterization

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Contributing Institute(s):

1. Grundlagen der Elektrochemie (IEK-9)

Research Program(s):

1. 131 - Electrochemical Storage (POF3-131) (POF3-131)
2. HITEC - Helmholtz Interdisciplinary Doctoral Training in Energy and Climate Research (HITEC) (HITEC-20170406) (HITEC-20170406)

Appears in the scientific report 2018

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Database coverage:
; ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF < 5 ; JCR ; NCBI Molecular Biology Database ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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