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In Situ Construction of a LiF-Enriched Interfacial Modification Layer for Stable All-Solid-State Batteries
Tianpeng Jiao1, Meng Xia1, Zirong Chen1
1State Key Laboratory for Physical Chemistry of Solid Surface, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.
ACS Applied Materials & Interfaces
|June 24, 2022
Summary
A novel carbon fluoride-silver composite effectively suppresses lithium dendrite growth in all-solid-state batteries by forming a protective lithium fluoride layer, enhancing safety and performance for high-energy storage.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- All-solid-state batteries (ASSBs) promise high energy density but face challenges with unstable interfaces between solid electrolytes and lithium metal anodes.
- Lithium (Li) dendrite growth at the electrolyte-anode interface poses significant safety risks and limits battery cycle life.
Purpose of the Study:
- To develop a composite modification layer for sulfide solid-state electrolytes (SSEs) to suppress lithium dendrite penetration and interfacial reactions.
- To enhance the stability and safety of ASSBs utilizing lithium metal anodes.
Main Methods:
- Design and application of a carbon fluoride-silver (CF-Ag) composite to modify SSEs.
- In situ formation of lithium fluoride (LiF) nanocrystals within the modification layer via electrochemical reactions.
- Electrochemical testing of all-solid-state symmetric cells with lithium-boron alloy (LiB) anodes and full cells with LiB||LiNi0.6Mn0.2Co0.2O2 (NMC622) cathodes.
Main Results:
- The LiF-enriched modification layer effectively suppressed Li dendrite penetration and interfacial reactions.
- Symmetric cells with LiB anodes demonstrated stable operation for over 2,500 hours at 60 °C without shorting.
- Full cells exhibited improved capacity retention and a high Coulombic efficiency of 99.9% over 500 cycles.
Conclusions:
- The CF-Ag composite modification provides an effective strategy to stabilize the solid-state interface in ASSBs.
- This advanced interface architecture successfully addresses critical Li-dendrite issues, paving the way for safer, high-energy-density batteries.
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