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| Home > Publications database > TAILORING GRAIN-BOUNDARIES IN NASICONS TO ACHIEVE SUPERIOR IONIC CONDUCTIVITY AND DENDRITE TOLERANCE |
| Home > Publications database > TAILORING GRAIN-BOUNDARIES IN NASICONS TO ACHIEVE SUPERIOR IONIC CONDUCTIVITY AND DENDRITE TOLERANCE |
| Conference Presentation (Invited) | FZJ-2026-01357 |
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2025
Abstract: Developing highly conductive and reliable solid electrolytes is still an important step for the advancement of solid-state sodium batteries. NaSICON-type Na3.4Zr2Si2.4P0.6O12 (NZSP) exhibits extraordinary bulk conductivity (σbulk), but due to the thermal expansion anisotropy, only fair total ionic conductivity (σtotal) 1. In the present study, we further modified the grain boundaries of NZSP by adding 1-5 mol% Na3LaP2O8 (NLP) or LaNbO4 (LNO) to counteract the micro-crack formation. The σtotal of NZSP-NLP increased to 7.1 mS cm−1 at 25 °C 2. The critical current density of Na | modified NZSP | Na symmetric cells increased to 20 mA cm-2. Galvanostatic cycling of the cells with up to 10 mA cm−2 were also demonstrated 2, which is not only much better than the results of pristine NZSP 3, but also indicating the unprecedented dendrite tolerance. The σtotal of NZSP-LNO even increased to 9.2 mS cm−1 at 25 °C 4, surpassing other reported polycrystalline oxide solid electrolytes. However, the dendrite tolerance of NZSP-LNO has no apparent difference compared the pristine materials, probably due to the lower electrochemical stability of LNO. The possible mechanism of how the extra NLP or LNO influence the microstructure of grain boundaries, as well as their impact on conductivity and dendrite tolerance is also discussed. 1. J. Mater. Chem. A, 2019, 7, 7766–7776. 2. J. Power Sources 2025, 626, 235773.3. Adv. Energy Mater. 2022, 12, 2201680.4. Adv. Energy Mater. 2024, 14, 2404985.
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