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@INPROCEEDINGS{Tsai:202342,
      author       = {Tsai, Chih-Long and Vinod Chandran, C. and Besmehn, Astrid
                      and Uhlenbruck, Sven and Gehrke, Hans-Gregor and Reppert,
                      Thorsten and Heitjans, P. and Guillon, Olivier},
      title        = {{L}ithium {D}endrite {G}rowth in {H}ot {P}ressed
                      {T}a-{S}ubstituted {L}i7{L}a3{Z}r2{O}12},
      reportid     = {FZJ-2015-04606},
      year         = {2015},
      abstract     = {Lithium metal has the lowest native electrochemical
                      potential, -3.4 V vs. H2, and extremely high specific
                      capacity, 3860 mA h/g, and low density, 0.59 g/cm3. These
                      properties make it an ideal anode for rechargeable batteries
                      as well as for next generation Li-S and Li-air batteries.
                      However, the use of metallic Li in a rechargeable battery is
                      not succesful until now due to the difficulty of suppressing
                      the growth of Li dendrite. Theoretical calculations suggest
                      the dendrite can be suppressed if the used electrolyte has a
                      shear modulus of more than twice that of the metallic Li,
                      ~109 Pa, or a Li-ion transfer number tLi+ approaching1.
                      Therefore, the garnet structured Li7La3Zr2O12 (LLZ) solid
                      state Li-ion conductor is an ideal material for preventing
                      dendrite growth because of its unity ionic transfer number,
                      high mechanical strength and chemically stability in contact
                      with metallic Li.However, Li dendrite formation was reported
                      by Yamamoto et al. from their Al-substituted LLZ and
                      Ta-substituted LLZ with unclear reason. In this research,
                      two samples which are Al contaminated and Al free
                      Ta-substituted LLZ were fabricated by hot pressing. Both
                      samples have relative densities $>99\%$ and total
                      conductivities ~1 mS/cm at room temperature. During the
                      dendrite studies, impedance measurements show rapid decrease
                      in total resistances within a couple of hundred seconds
                      which indicates the dendrite can be formed in such a high
                      dense ceramic in a short time. Solid-State NMR shows
                      metallic Li was found inside the dense pellet which was also
                      supported by XPS. The dendrite test results and the possible
                      reasons for the formation of the Li dendrite will be
                      discussed in this presentation.},
      month         = {Jun},
      date          = {2015-06-15},
      organization  = {20th International Conference on Solid
                       State Ionics, Keystone, Colorado (USA),
                       15 Jun 2015 - 19 Jun 2015},
      subtyp        = {After Call},
      cin          = {IEK-1},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      pnm          = {131 - Electrochemical Storage (POF3-131) / HITEC -
                      Helmholtz Interdisciplinary Doctoral Training in Energy and
                      Climate Research (HITEC) (HITEC-20170406)},
      pid          = {G:(DE-HGF)POF3-131 / G:(DE-Juel1)HITEC-20170406},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/202342},
}