%0 Journal Article
%A Liu, Limin
%A Ma, Qianli
%A Zhou, Xiaoliang
%A Ding, Ziming
%A Grüner, Daniel
%A Kübel, Christian
%A Tietz, Frank
%T Simultaneously improving sodium ionic conductivity and dendrite behavior of NaSICON ceramics by grain-boundary modification
%J Journal of power sources
%V 626
%@ 0378-7753
%C New York, NY [u.a.]
%I Elsevier
%M FZJ-2024-06392
%P 235773 -
%D 2025
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:001359959700001
%R 10.1016/j.jpowsour.2024.235773
%U https://juser.fz-juelich.de/record/1032626