Event
ECS Seminar: Li7La3Zr2O12 as a Solid-State Electrolyte for Li Batteries
Thursday, March 16, 2017
1:00 p.m.-2:00 p.m.
Catherine Stephens
301 405 9378
csteph5@umd.edu
http://umerc.umd.edu
Jeff Wolfenstine, Army Research Laboratory, RDRL-SED-C
Abstract
In recent years there has been a resurgence in the use of Li metal as an anode, because such use can to lead to rechargeable batteries with higher energy than currently exist. Using a Li anode with a liquid electrolyte can lead to dendrite shorting and flammability issues. To overcome these problems Li-ion conducting solid electrolytes are attracting considerable attention. The major requirements for the solid Li-ion conducting electrolyte are: high Li-ion conductivity, low electronic conductivity, high relative density, chemical/electrochemical stability with the Li anode and cathodes, adequate mechanical properties and low interfacial impedance. One such solid electrolyte that meets a majority of these requirements is cubic Li7La3Zr2O12 (LLZO). It is the purpose of this talk to discuss: 1] methods that lead to highly dense and high total Li-ion conductivity LLZO, 2] determination of the elastic modulus, hardness and fracture toughness of LLZO, 3] stability of LLZO with ambient air and Li, 4] high voltage stability of LLZO and 5] impedance and cycling behavior of Li/LLZO/Li cells. The results will compared to theoretical predictions and existing data for other oxide based Li-ion conductors.
