Rapid Thermal Annealing of Cathode-Garnet Interface toward High-Temperature Solid State Batteries
Boyang Liu1, Kun Fu1, Yunhui Gong1
1Department of Materials Science and Engineering and ‡University of Maryland Energy Research Center, University of Maryland , College Park, Maryland 20742, United States.
Nano Letters
|July 18, 2017
Summary
This study presents a high-temperature all-solid-state battery using a garnet solid electrolyte and V2O5 cathode, operating safely at 100 °C. A novel annealing method significantly reduced interfacial resistance, enhancing battery performance and safety.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Conventional batteries face safety issues like thermal runaway due to flammable liquid electrolytes.
- High-temperature operation requires thermally stable components and electrolytes.
Purpose of the Study:
- To develop a safe, high-temperature all-solid-state battery.
- To address and mitigate high interfacial resistance between solid electrolytes and cathodes.
- To enhance the performance of solid-state batteries at elevated temperatures.
Main Methods:
- Fabrication of an all-solid-state battery with a garnet solid electrolyte, lithium metal anode, and V2O5 cathode.
- Implementation of a rapid thermal annealing method to improve cathode-electrolyte contact.
- Electrochemical characterization at 100 °C.
Main Results:
- The battery operated effectively at 100 °C.
- Rapid thermal annealing reduced interfacial resistance from 2.5 × 10^4 to 71 Ω·cm² (room temp) and 170 to 31 Ω·cm² (100 °C).
- The full cell demonstrated 97% Coulombic efficiency at 100 °C with low interfacial resistance.
Conclusions:
- A strategy for developing high-temperature all-solid-state batteries using garnet solid electrolytes was established.
- The rapid thermal annealing method effectively reduced interfacial resistance between V2O5 cathodes and garnet electrolytes.
- The developed battery offers improved safety and performance for high-temperature applications.
