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@INPROCEEDINGS{Ma:863621,
      author       = {Ma, Qianli and Tsai, Chih-Long and Tietz, Frank and
                      Guillon, Olivier},
      title        = {{T}he re-discovery of {NASICON} materials},
      reportid     = {FZJ-2019-03633},
      year         = {2019},
      abstract     = {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.},
      month         = {Jun},
      date          = {2019-06-16},
      organization  = {The 22nd International Conference on
                       Solid State Ionics 22nd International
                       Conference on Solid State Ionics,
                       PyeongChang (Korea), 16 Jun 2019 - 21
                       Jun 2019},
      subtyp        = {After Call},
      cin          = {IEK-1},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      pnm          = {131 - Electrochemical Storage (POF3-131)},
      pid          = {G:(DE-HGF)POF3-131},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/863621},
}