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In Situ Grain Boundary Engineering Enabling Ultralong Stable Cycling Garnet-Based Solid-State Electrolytes
Zichang You1,2, Chujun Zheng1,2, Jiaxin Wu1,2
1State Key Lab High Performance Ceram and Superfine Microstructure Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P. R. China.
Nano Letters
|March 20, 2025
Summary
Solid-state lithium metal batteries show promise, but dendrite growth is a challenge. A new grain boundary modification strategy effectively suppresses dendrites, enabling stable, high-performance batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Solid-state lithium metal batteries (SSLMBs) offer enhanced safety and energy density.
- Lithium dendrite growth in solid electrolytes remains a critical obstacle for SSLMB application.
Purpose of the Study:
- To develop an in situ grain boundary (GB) modification strategy to suppress lithium dendrite growth in solid electrolytes.
- To enhance the performance and safety of solid-state lithium metal batteries.
Main Methods:
- In situ modification of grain boundaries in Ta-doped garnet electrolytes using LiTaO3 (LTO).
- Formation of a pseudocrystal Li3TaO4/Zr3O (LZT) phase at grain boundaries.
- Characterization of the modified electrolyte's electronic conductivity, mechanical properties, and electrochemical performance.
Main Results:
- The LZT phase at GBs reduced electronic conductivity to 8.58 × 10^-9 S cm^-1.
- The modified electrolyte exhibited enhanced GB bonding and fracture toughness, effectively suppressing dendrite formation.
- Symmetrical Li cells showed a high critical current density of 2.2 mA cm^-2 and stable cycling for 12,000 hours.
Conclusions:
- The in situ GB modification strategy using LTO is effective in suppressing dendrite growth in SSLMBs.
- The developed 2LTaO modified electrolyte demonstrates excellent electrochemical stability and mechanical integrity.
- This approach offers a promising pathway for advancing high-performance solid-state lithium metal batteries.
