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Sokseiha Muy1 John Bachman2 Livia Giordano2 3 Hao-Hsun Chang4 Douglas Abernathy5 Dipanshu Bansal5 Olivier Delaire5 6 Hori Satoshi7 Ryoji Kanno7 Filippo Maglia8 Saskia Lupart8 Peter Lamp8 Yang Shao-Horn1 2 4

1, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States
2, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States
3, Università di Milano-Bicocca, Milano, , Italy
4, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States
5, Oak Ridge National Laborator, Oak Ridge, Tennessee, United States
6, Duke University, Durham, North Carolina, United States
7, Tokyo Institute of Technology, Tokyo, , Japan
8, BMW Group, Munich, , Germany

Electrochemical energy storage devices are clean and efficient, but their current cost and performance limit their use in many transportation and stationary applications. Lithium-ion batteries are one of the leading candidates for these large applications, however their current use of liquid electrolytes negatively effects their lifetime and safety. Furthermore, the liquid electrolyte's potential stability window, thermal stability, and volatility are of particular concern in larger applications. Solid-state electrolytes are investigated as one of the best solutions to overcome these challenges. However, the ionic conductivity of many solid electrolytes is still much lower than that of the liquid counterparts. In this talk, a new design approach based on lattice dynamics properties of several families of Li-ion conductors is proposed, we show that a correlation exists between the enthalpy of migration and the average vibrational frequency of Lithium in these structures. Moreover, we will also show that the stability of Li-ions conductor in contact with Li metal can also be linked to this concept by showing that there is a correlation between the oxidative voltage and the average vibrational frequency of anions in these structures.

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