Journal Article

FZJ-2021-05584

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Origin of High Interfacial Resistance in Solid‐State Batteries: LLTO/LCO Half‐Cells**

Xu, P. ; Rheinheimer, W.FZJ* ; Mishra, A. ; Shuvo, S. N. ; Qi, Z. ; Wang, H. ; Dongare, A. M. ; Stanciu, L. A. (Corresponding author)

2021
Wiley-VCH Weinheim

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Please use a persistent id in citations: http://hdl.handle.net/2128/31213  doi:10.1002/celc.202100189

Abstract: The interface between cathode and electrolyte is a significant source of large interfacial resistance in solid-state batteries (SSBs). Spark plasma sintering (SPS) allows densifying electrolyte and electrodes in one step, which can improve the interfacial contact in SSBs and significantly shorten the processing time. In this work, we proposed a two-step joining process to prepare cathode (LiCoO2, LCO)/electrolyte (Li0.33La0.57TiO3, LLTO) half cells via SPS. Interdiffusion between Ti4+/Co3+ was observed at the interface by SEM/STEM, resulting in the formation of the Li−Ti−La−Co−O and Li−Ti−Co−O phases in LLTO and the Li−Co−Ti−O phase in LCO. Computational modeling was performed to verify that the Li−Ti−Co−O phase has a LiTi2O4 host lattice. In a study of interfacial electrical properties, the resistance of this interdiffusion layer was found to be 105 Ω, which is 40 times higher than the resistance of the individual LLTO phase. The formation of an interdiffusion layer is identified as the origin of the high interface resistance in the LLTO/LCO half-cell.

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Contributing Institute(s):

1. Werkstoffsynthese und Herstellungsverfahren (IEK-1)

Research Program(s):

1. 1221 - Fundamentals and Materials (POF4-122) (POF4-122)
2. 1222 - Components and Cells (POF4-122) (POF4-122)

Appears in the scientific report 2022

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

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