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Reactive Magnesium Nitride Additive: A Drop-in Solution for Lithium/Garnet Wetting in All-Solid-State Batteries
Linhui Chen1, Rong-Ao Tong1, Jingxi Zhang1
1State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China.
Angewandte Chemie (International Ed. in English)
|May 2, 2023
Summary
Adding nitride powder to garnet oxides like LLZTO improves solid-state battery performance. This creates lithium nitride, enhancing wetting and stability for lithium-metal batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Solid-State Batteries
Background:
- Garnet oxides, such as Li6.4La3Zr1.4Ta0.6O12 (LLZTO), are promising solid electrolytes for lithium-metal batteries.
- Achieving stable interfaces between solid electrolytes and lithium metal anodes is a significant challenge.
Purpose of the Study:
- To improve the interfacial properties and electrochemical performance of LLZTO-based solid-state batteries.
- To address the poor wetting issue at the Li/LLZTO interface.
Main Methods:
- Incorporation of powder-form magnesium nitride as an additive.
- In situ formation of lithium nitride at the Li/LLZTO interface.
- Testing various nitride additives including TiN, ZrN, TaN, and NbN.
Main Results:
- The in situ formed lithium nitride promotes reactive wetting at the Li/LLZTO interface.
- Interfacial resistance was lowered, and critical current density (CCD) was increased.
- Improved cycling stability was observed in the electrochemical cells.
Conclusions:
- The reactive dispersion-plus-wetting strategy using nitride additives is effective for enhancing solid-state battery performance.
- This approach offers a generalizable design for improving other solid-state devices.
