TY  - CONF
AU  - Ma, Qianli
AU  - Tsai, Chih-Long
AU  - Tietz, Frank
AU  - Guillon, Olivier
TI  - The re-discovery of NASICON materials
M1  - FZJ-2019-03633
PY  - 2019
AB  - Despite of huge efforts, the lack of suitable candidate for electrolytes still impedes the development of all-solid-state Na batteries. Na3+xZr2Si2+xP1-xO12 (-0.2 ≤ x ≤ 0.2) are the very first composition series of NASICONs discovered 40 years ago and were reported having a total Na-ion conductivity of ~10-4 S cm-1 at room temperature. In the present study, this composition series is reconsidered and the focusing range of stoichiometry has been varied from x = 0 to x = 0.6. A solution-assisted solid-state reaction method is applied for powder preparation. Surprisingly, a total conductivity of over 5 × 10-3 S cm-1 is achieved for Na3.4Zr2Si2.4P0.6O12 (NZSP) at 25 °C, which is the best value of all reported polycrystalline Na-ion conductors. A bulk conductivity of about 1.5 × 10-2 S cm-1 is also revealed by high frequency impedance spectroscopy up to 3 GHz for NZSP at 25 °C. The parameters influencing the total conductivity are discussed in detail. Benefitted from the superior total conductivity of NZSP, symmetric cells of Na/NZSP/Na and full-ceramic cells of Na3V2P3O12 (NVP)/NZSP/NVP have been fabricated and tested at room temperature with good cycling performance.
T2  - The 22nd International Conference on Solid State Ionics 22nd International Conference on Solid State Ionics
CY  - 16 Jun 2019 - 21 Jun 2019, PyeongChang (Korea)
Y2  - 16 Jun 2019 - 21 Jun 2019
M2  - PyeongChang, Korea
LB  - PUB:(DE-HGF)6
UR  - https://juser.fz-juelich.de/record/863621
ER  -