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Constructing a Superlithiophilic 3D Burr-Microsphere Interface on Garnet for High-Rate and Ultra-Stable Solid-State
Butian Chen1, Jicheng Zhang1, Tianran Zhang1
1Center of Materials Science and Optoelectronics Engineering, College of Materials Science and Optoelectronic Technology, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|February 16, 2023
Summary
A novel 3D burr-microsphere interface layer enhances garnet solid-state electrolytes for lithium metal batteries. This boosts critical current density and cycling stability, overcoming key application barriers.
Area of Science:
- Materials Science
- Electrochemistry
- Solid-State Chemistry
Background:
- Garnet-type solid-state electrolytes (SSEs) like Li6.5La3Zr1.5Ta0.5O12 offer high ionic conductivity and wide electrochemical windows.
- Practical application of garnet SSEs is hindered by high interfacial resistance, lithium dendrite growth, and low critical current density (CCD).
Purpose of the Study:
- To develop an in situ interface layer that enhances the performance of garnet-type SSEs in solid-state lithium metal batteries.
- To address critical interfacial issues and enable high-rate, stable operation.
Main Methods:
- Construction of a 3D burr-microsphere (BM) interface layer using ionic conductor LiF-LaF3.
- In situ formation of a superlithiophilic interface with molten lithium.
- Electrochemical characterization of symmetrical and full cells, including CCD, impedance, and cycling stability tests.
Main Results:
- The 3D-BM interface layer exhibits superlithiophilicity (contact angle of 7° with molten Li).
- Symmetrical cells achieved a high CCD of 2.7 mA cm⁻², ultra-low interface impedance of 3 Ω cm², and 12,000 hours of stable cycling without dendrites.
- Full cells demonstrated excellent cycling stability and high rate capacity with various cathode materials.
Conclusions:
- The developed 3D-BM interface layer effectively mitigates interfacial resistance and suppresses lithium dendrite growth in garnet SSEs.
- This strategy significantly enhances the performance and stability of solid-state lithium metal batteries.
- The interface layer shows good air stability, indicating its practical potential.
