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@ARTICLE{Liu:902445,
      author       = {Liu, Yujian and Liu, Limin and Peng, Jinsong and Zhou,
                      Xiaoliang and Liang, Dongshi and Zhao, Lei and Su, Jiawen
                      and Zhang, Bo and Li, Si and Zhang, Naiqing and Ma, Qianli
                      and Tietz, Frank},
      title        = {{A} niobium-substituted sodium superionic conductor with
                      conductivity higher than 5.5 m{S} cm−1 prepared by
                      solution-assisted solid-state reaction method},
      journal      = {Journal of power sources},
      volume       = {518},
      issn         = {0378-7753},
      address      = {New York, NY [u.a.]},
      publisher    = {Elsevier},
      reportid     = {FZJ-2021-04267},
      pages        = {230765 -},
      year         = {2022},
      abstract     = {Although research on all-solid-state sodium batteries
                      (ASSSBs) have been conducted for many years, the
                      solidstateelectrolyte (SSE) material is still far from
                      practical application at room temperature. One major reason
                      isthat no suitable electrolyte material with high ionic
                      conductivity has been found yet. In this study, Nb5+
                      isintroduced into NASICON-type solid electrolyte, where Nb5+
                      substituted Na3.4Zr2Si2.4P0.6O12 (NZSP) is preparedby a
                      solution-assisted solid-state reaction method. The best
                      ionic conductivity is as high as 5.51 mS cm􀀀 1 which isa
                      significant improvement. High-frequency electrochemical
                      impedance spectroscopy shows that the increase intotal
                      conductivity is mainly due to the decrease of grain boundary
                      impedance as well as bulk impedance. Thedecrease in grain
                      boundary impedance is probably owing to the increase in
                      density of the electrolyte materialafter incorporation of
                      the Nb content, which has a beneficial impact of the
                      sintering of NZSP. The decrease inbulk impedance rather
                      results from the ratio of sodium ion concentration and
                      sodium vacancy concentration of3.3:0.7 in the crystal
                      structure, thus facilitating the sodium ion transport.
                      Symmetric cells with sodium metal aselectrodes (Na|Nb5+
                      substituted NZSP|Na) are subsequently assembled and cycled
                      stably for 60 cycles at acurrent density of 0.05 mA/cm2.},
      cin          = {IEK-1},
      ddc          = {620},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      pnm          = {1223 - Batteries in Application (POF4-122)},
      pid          = {G:(DE-HGF)POF4-1223},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000720745000001},
      doi          = {10.1016/j.jpowsour.2021.230765},
      url          = {https://juser.fz-juelich.de/record/902445},
}