The potential replacement of liquid electrolytes in lithium ion batteries by solid electrolytes drives extensive research activities. Today, inorganic solid electrolytes are available that show higher lithium ion conductivity than liquid electrolytes, and solid state batteries seem to come closer to be a viable option. However, several key challenges have to be overcome before solid state batteries achieve a performance that would allow to construct competitive cells beyond the size of microbatteries which reasonable energy and power density.<br/>In this lecture the following key issues will be discussed, and potential solutions will be presented:<br/>The thermodynamic stability of solid electrolytes in contact with typical electrode materials is often rather limited, and the formation of “SEI”-type interphases is observed.<br/>Solid electrolytes are considered as “enablers” for lithium metal anodes, but both chemical and mechanical problems complicate the lithium metal kinetics.<br/>Volume changes of electrode materials during discharge and charge lead to mechanical instabilities that also have to be addressed. This is discussed in particular for important cathode materials.

Key challenges in the development of solid state lithium batteries

253rd National Meeting (2017)

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