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Thermal Stability of LiCoO2 and Garnet Solid Electrolyte Li7La3Zr2O12

Published byBenjamin Roth Modified over 6 years ago

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Presentation on theme: "Thermal Stability of LiCoO2 and Garnet Solid Electrolyte Li7La3Zr2O12"— Presentation transcript:

1 Thermal Stability of LiCoO2 and Garnet Solid Electrolyte Li7La3Zr2O12

2 Outline Introduction/Background Experimental Process Results
Conclusion

3 Motivation To better understand the thermal
stability of the LCO and LLZO composite Decrease the interfacial impedances

4 Solid State Electrolytes
Solid superionic conducting material Replaces traditional liquid electrolyte Creates a strong ionic bridge between cathode and anode

5 Benefits Safety Increased Power Density Degeneration
Boeing 787, Tesla Model S, Cell Phones, Laptops, Etc Increased Power Density More battery life and charge cycles Degeneration Can last thousands of years Temperature Stability

6 Cons Cost to Produce Interface Impedences
Rare materials – Ex. Germanium Lengthy, in depth production methods Interface Impedences Poor cycle stability Poor rate capability Currently Unrealistic Applications Ex. Lithium-Air

7 My Research Different Lithium Lanthanum Zirconium Oxide States
Cubic Tetragonal X-Ray Diffraction (XRD) Electrochemical Impedance Spectroscopy (EIS) Differential Scanning Calorimetry (DSC)

8 Material Fabrication Initial LLZO mixing Cold Press and Heat Sample
Cubic doped with aluminum Ball Mill Cold Press and Heat Sample Grind and Store in Glove Box Spark Plasma Sintering (SPS), XRD, Furnace Sintering

9 Cubic LLZO Electrochemical Impedance Spectroscopy

10 Tetragonal LLZO Electrochemical Impedance Spectroscopy

11 XRD of Pure c-LLZO and t-LLZO

12 XRD Analysis of Cubic Phase LLZO - LCO

13 XRD Analysis of Tetragonal Phase LLZO - LCO

14 Cubic Differential Scanning Calorimetry
H2O LiOH LiZrO and LaLiCoO

15 Tetragonal Differential Scanning Calorimetry
H2O LiOH LiZrO and LaLiCoO Lithium Vaporization

16 Conclusion Cubic LLZO is not thermally stable enough to undergo sintering Different methods should be considered LCO and c-LLZO could still be good product despite impurities Impurities may have minimal effect Needs further research

17 Thank you for your time!

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