Development of Garnet-Type Li Ion Electrolytes for All-Solid-State Li Ion Batteries

The high energy density Li ion batteries require a replacement of currently used organic polymer electrolyte with highly conducting solid-state materials in terms of safety reasons. Solid electrolytes exhibiting high total Li ion conductivity, negligible electronic conductivity and wide electrochemical window (up to 6 V/Li/Li⁺) are preferable for application in solid-state Li ion batteries [1,2]. Garnet-like oxides, with general formula, Li₅La₃M₂O₁₂ (M = Nb, Ta) are emerged as a promising class of Li⁺ conductors among several other solid-state materials [1]. The increase in Li content has proven to be increasing the Li ion conductivity of garnets and Li₇La₃Zr₂O₁₂ have a highest conductivity of the order of 10^-4 Scm^-1 at ambient condition [3]. In this talk, we report the effect of excess Li added during synthesis to avoid Li volatilization on the ionic conductivity of garnet-type materials and discuss the recent developments on optimization of ionic conductivity of garnets.

References

1.         V. Thangadurai, H. Kaack and W. J. F. Weppner, J. Am. Ceram. Soc., 86, 437 (2003).

2.         J. B. Goodenough and K.-S. Park, J. Amer. Chem. Soc., 135, 1167 (2013).

3.         R. Murugan, V. Thangadurai and W. Weppner, Angew. Chem. Int. Ed. Engl., 46, 7778 (2007).