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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
Published on: August 12, 2013
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Protecting Li-metal anode with LiF-enriched solid electrolyte interphase derived from a fluorinated graphene
Xiaohong Wu1, Yuhao Hong2, Zhengang Li3
1Fujian Provincial Key Laboratory of Functional Materials and Applications, Institute of Advanced Energy Materials, School of Materials Science and Engineering, Xiamen University of Technology, Xiamen, 361024, P. R. China. xiaohongwu@xmut.edu.cn.
Nanoscale
|October 7, 2024
Summary
Fluorinated graphene (F-Gr) additive in electrolytes prevents lithium dendrites and improves reversibility in Li-metal batteries (LMBs). This enhances battery lifespan and stability by creating a robust solid electrolyte interphase (SEI) layer.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Lithium-metal anodes (LMAs) are crucial for next-generation Li-metal batteries (LMBs).
- Dendrite growth and poor Li plating/stripping reversibility hinder LMA performance and LMB application.
- Developing stable solid electrolyte interphase (SEI) layers is key for LMA protection.
Purpose of the Study:
- To investigate the use of fluorinated graphene (F-Gr) as an electrolyte additive in LMBs.
- To understand how F-Gr influences SEI formation and stability.
- To enhance the electrochemical performance and lifespan of Li-metal anodes.
Main Methods:
- Introduction of F-Gr as a sacrificial electrolyte additive in EC/EMC-based electrolytes.
- Electrochemical cycling of Li-metal anodes.
- Surface-sensitive characterizations including X-ray Photoelectron Spectroscopy (XPS) and Time-of-Flight Secondary Ion Mass Spectrometry (TOF-SIMS).
Main Results:
- F-Gr additive promotes the formation of a LiF-enriched and uniformly distributed organic/inorganic SEI layer.
- The SEI layer exhibits enhanced robustness, denseness, and stability.
- Achieved dendrite-free Li-metal anode morphology and improved Li plating/stripping reversibility.
- Significantly enhanced long-term lifespan of Li-metal batteries.
Conclusions:
- F-Gr is an effective electrolyte additive for protecting Li-metal anodes in LMBs.
- The F-Gr-induced SEI architecture is critical for superior electrochemical performance.
- This study provides insights into optimizing electrolyte design for advanced LMBs.
