Journal Article

FZJ-2020-04849

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Extensive aging analysis of high-power lithium titanate oxide batteries: Impact of the passive electrode effect

Bank, T. (Corresponding author) ; Feldmann, J. ; Klamor, S. ; Bihn, S.RWTH* ; Sauer, D. U.FZJ*

2020
Elsevier New York, NY [u.a.]

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Please use a persistent id in citations: http://hdl.handle.net/2128/31082  doi:10.1016/j.jpowsour.2020.228566

Abstract: Partial electrification of vehicle drive trains, for example by the usage of 48 V systems, require high-powerbatteries with extreme robustness to temperatures, current rates and energy throughputs. In this study, theapplication-relevant lifetime performance of 33 state-of-the-art high-power lithium titanate oxide nickel manganesecobalt oxide (LTO|NMC) cells is measured under cyclic, calendar, and drive cyclic aging regimes. Regularextended check-ups reveal the cell performance in terms of capacity loss and internal resistance increase, whichallows for the identification of critical operating conditions. For the first time a passive electrode effect isidentified in calendar aging tests of LTO cells in which the cathode is geometrically and capacitively oversized.Passive electrode areas lead to a change in cell balancing, which can be illustrated by the shift of the half-cellvoltage curves. Generally, the investigated cells show an excellent cycle stability for shallow cycles, even athigh ambient temperatures and high current rates. Only large cycle depths greater than 70% at elevated temperaturesreduce the battery life significantly. Furthermore, the results show that cells cycled in areas of low stateof charge age faster than in areas of high state of charge. The rise in internal resistance under calendar aging hasthe most detrimental influence on lifetime in a 48 V battery.

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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 2020

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

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