Journal Article

FZJ-2024-06392

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Simultaneously improving sodium ionic conductivity and dendrite behavior of NaSICON ceramics by grain-boundary modification

Liu, L. ; Ma, Q. (Corresponding author)FZJ* ; Zhou, X. ; Ding, Z. ; Grüner, D.FZJ* ; Kübel, C. ; Tietz, F.FZJ*

2025
Elsevier New York, NY [u.a.]

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Please use a persistent id in citations: doi:10.1016/j.jpowsour.2024.235773  doi:10.34734/FZJ-2024-06392

Abstract: Developing highly conductive and reliable solid-electrolytes (SEs) is still important for the advancement of solid-statesodium batteries. NaSICON-type polycrystalline SEs exhibit the dominance of grain-boundary resistance tothe total resistance, which is mainly due to the thermal expansion anisotropy of NaSICON-type lattices. In thisstudy, we modify the grain boundaries of NaSICON-type Na3.4Zr2Si2.4P0.6O12 (NZSP) by adding 2.5 mol%Na3LaP2O8 (NLP) to counteract the effect of thermal expansion anisotropy. NLP does not serve as a sintering aidfor NZSP because the sintering temperature and relative density of NZSP is not changed. The total conductivity ofmodified NZSP increases to 7.1 mS cm􀀀 1 at 25 ◦C, surpassing other reported polycrystalline oxide SEs. Thecritical current density of Na | modified NZSP | Na symmetric cells increases to 22 mA cm􀀀 2. The cells cansurvive under long-term galvanostatic cycling up to 10 mA cm􀀀 2, indicating the unprecedented dendrite tolerance.Remarkably, the main failure mode in these cells shifts from Na-dendrite short-circuiting to the loop ofsubstantial polarizations and short-circuits.

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Contributing Institute(s):

1. Werkstoffsynthese und Herstellungsverfahren (IMD-2)
2. Werkstoffstruktur und -eigenschaften (IMD-1)

Research Program(s):

1. 1221 - Fundamentals and Materials (POF4-122) (POF4-122)
2. 1222 - Components and Cells (POF4-122) (POF4-122)
3. DFG project G:(GEPRIS)390874152 - EXC 2154: POLiS - Post Lithium Storage Cluster of Excellence (390874152) (390874152)

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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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