Enabling High Energy Lithium Batteries through the use of a Li7La3Zr2O12 Solid Electrolyte
Enabling High Energy Lithium Batteries through the use of a Li7La3Zr2O12 Solid Electrolyte [3,965]
2019 / 03 / 25 PM 4:00
Location: 301 - 1420
Speaker: Dr. Jeff Wolfenstine
Army Research Laboratory
In recent years there has been a resurgence in the use of Li metal as an anode, because such use can to lead to higher energy rechargeable batteries than the current Li-ion batteries which will result in longer run times for electric vehicles. Using a Li metal anode with a liquid electrolyte can lead to dendrite shorting and flammability issues. To overcome the issues associated liquid electrolytes Li-ion conducting solid electrolytes are attracting considerable attention. The major requirements for the solid Li-ion electrolyte are: high Li-ion conductivity, low electronic conductivity, high relative density, chemical stability with the electrodes in particular metallic Li, robust mechanical properties and adequate rate capability. One such solid electrolyte that meets 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] air and water stability of LLZO, 3] evaluation of the room and elevated temperature stability of LLZO with Li, 4] high voltage stability of LLZO, 5] determination of the elastic modulus, hardness and fracture toughness of LLZO and 6] rate capability of Li/LLZO cells. The results will be compared to theoretical predictions and existing data for other oxide-based Li-ion conductors.