Related Experiment Video
Updated: Jul 4, 2025
10:53
Preparation of Graphene Liquid Cells for the Observation of Lithium-ion Battery Material
Published on: February 5, 2019
9.0K
Fluorine-Terminated Self-Assembled Monolayers Grafted Graphite Anode Inducing a LiF-Dominated SEI Inorganic Layer for
Min Zhong1, Mingliang Bai1, Wenzhuo Shen1
1Department of Electronic Engineering, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
ACS Applied Materials & Interfaces
|January 25, 2024
Summary
Grafting fluorine-terminated monolayers on graphite anodes creates a uniform LiF-rich solid electrolyte interphase (SEI). This enhances lithium-ion transport, improving fast-charging and stability in lithium-ion batteries (LIBs).
Area of Science:
- Materials Science
- Electrochemistry
- Chemical Engineering
Background:
- Electrochemical kinetics of lithium-ion (Li+) transport across the solid electrolyte interphase (SEI) are critical for lithium-ion battery (LIB) performance.
- The SEI layer on graphitic anodes influences ion desolvation, transport, and interfacial charge transfer, impacting rate capability and cycle life.
- Controlling SEI composition and structure is key to optimizing anode performance in LIBs.
Purpose of the Study:
- To modify the surface of spherical graphite particles using fluorine-terminated self-assembled monolayers.
- To regulate the chemical composition and structure of the SEI formed on graphite anodes.
- To investigate the impact of the modified SEI on Li+ ion transport and battery performance.
Main Methods:
- Grafting fluorine-terminated self-assembled monolayers onto spherical graphite particles.
- Formation of SEI in conventional ester electrolytes on functionalized graphite.
- Comprehensive characterization (e.g., spectroscopy, microscopy) and first-principles calculations.
- Fabrication and testing of LiCoO2//graphite full cells.
Main Results:
- A uniform LiF-dominated SEI film was successfully generated on the functionalized graphite anode.
- Cleavage of carbon-fluorine bonds in the monolayers facilitated LiF SEI formation.
- The LiF-dominated SEI significantly improved desolvated lithium-ion transport across the interface.
- LiCoO2//graphite full cells exhibited enhanced fast-charging capability and improved cycle stability.
Conclusions:
- Surface functionalization with fluorine-terminated monolayers is an effective strategy to create LiF-rich SEI layers on graphite anodes.
- The LiF-dominated SEI layer promotes efficient lithium-ion transport, boosting battery performance.
- This approach offers a potential pathway for modifying various anode materials to enhance interfacial properties in LIBs.
