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CaF2 nanoparticles enabling LiF-dominated solid electrolyte interphase for dendrite-free and ultra-stable lithium
Quan Zheng1, Zhiyi Zhao1, Guohao Zhao1
1School of Materials and Energy, Lanzhou University, Lanzhou 730000, China.
Journal of Colloid and Interface Science
|July 25, 2024
Summary
This study developed a protective LiF-dominated solid electrolyte interphase using CaF2 nanoparticles to prevent lithium dendrite growth and interfacial reactions in lithium metal batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Lithium metal batteries face challenges from lithium dendrite growth and interfacial reactions, hindering their practical use.
- An artificial solid electrolyte interphase is crucial for regulating lithium deposition and preventing side reactions.
Purpose of the Study:
- To design and implement a uniform LiF-dominated solid electrolyte interphase.
- To enhance the stability and safety of lithium metal anodes.
Main Methods:
- In-situ reaction between CaF2 nanoparticles and Li anode to form a LiF-rich solid electrolyte interphase.
- Fabrication of protected lithium electrodes.
- Testing of symmetric cells and LiFePO4//Li cells.
Main Results:
- Achieved dendrite-free lithium deposition.
- Demonstrated exceptional electrode stability, surviving over 6000 hours at 2 mA cm-2 in symmetric cells.
- Attained over 1000 cycles with a low capacity decay rate of 0.015% per cycle in LiFePO4//Li cells.
Conclusions:
- The LiF-dominated solid electrolyte interphase effectively suppresses lithium dendrites and interfacial deterioration.
- This protective strategy significantly improves the cycling stability and lifespan of lithium metal batteries.
