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@INPROCEEDINGS{Tsai:834444,
      author       = {Tsai, Chih-Long and Roddatis, V. and Vinod Chandran, C. and
                      Ma, Qianli and Uhlenbruck, Sven and Heitjans, P. and
                      Guillon, Olivier},
      title        = {{L}i7{L}a3{Z}r2{O}12 {I}nterface {M}odification for {L}i
                      {D}endrite {P}revention},
      reportid     = {FZJ-2017-04400},
      year         = {2017},
      abstract     = {The development of electrochemical energy storage devices
                      is toward to higher energy density as well as safety. The
                      use of metallic Li as anode for rechargeable batteries could
                      increase as much as tenfold in the anode storage capacity
                      when compared to nowadays carbon based anode due to its
                      lowest native electrochemical potential ( -3.4 V vs. H2),
                      extremely high specific capacity (3860 mA h/g) and low
                      density (0.59 g/cm3). However, the use of metallic Li in a
                      rechargeable battery is not successful until now due to the
                      difficulty of suppressing the growth of Li dendrite which
                      could cause hazard of a battery. Theoretical calculations
                      suggest that if a shear modulus of used electrolyte is more
                      than twice that of metallic Li, ~109 Pa, or a Li-ion
                      transfer number tLi+ approaching 1, then the dendrite growth
                      can be suppressed. Therefore, the garnet structured
                      Li7La3Zr2O12 (LLZ) solid state Li-ion conductor is an ideal
                      material for using as electrolyte in rechargeable batteries
                      because of its unity ionic transfer number, high mechanical
                      strength and chemical stability to metallic Li.However, Li
                      dendrite formation was reported by Ishiguro et al [1,2] for
                      their Nb- and Ta-substituted LLZ with unclear reason. In
                      this research, samples which are Al-contaminated and Al-free
                      Ta-substituted LLZ were fabricated by hot pressing as well
                      as regular sintered process. Both samples fabricated by hot
                      press synthesis 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 highly
                      dense ceramic in a short time as well as in regular sintered
                      samples. Solid-State NMR demonstrates the presence of
                      metallic Li inside the dense pellet which is also supported
                      by TEM-EELS result [3]. The dendrite test results, reasons
                      for the formation of the Li-dendrite and pathways to prevent
                      the formation of Li-dendrite by interface modification will
                      be discussed in this presentation.},
      month         = {Jan},
      date          = {2017-01-22},
      organization  = {41st International Conference and
                       Exposition on Advanced Ceramics and
                       Composites, Daytona Beach, Florida
                       (USA), 22 Jan 2017 - 27 Jan 2017},
      subtyp        = {Invited},
      cin          = {IEK-1 / JARA-ENERGY},
      cid          = {I:(DE-Juel1)IEK-1-20101013 / $I:(DE-82)080011_20140620$},
      pnm          = {131 - Electrochemical Storage (POF3-131)},
      pid          = {G:(DE-HGF)POF3-131},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/834444},
}