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Updated: Aug 6, 2026
Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
Published on: December 20, 2016
Entropy-Driven Electrolyte Design for Lithium Metal Batteries: Achieving Interfacial Stability With Fluorinated
Chenyu Wang1, Zhiqiang You2, Jianhui Chen1
1Materials Genome Institute, State Key Laboratory of Green and Efficient Development of Phosphorus Resources, College of Materials Science and Engineering, Fuzhou University, Fuzhou, China.
Fluorinated fullerene C60F30 enhances lithium metal battery performance by creating a disordered interface and a stable solid electrolyte interphase, enabling high-rate, long-cycle life. This nanoparticle additive boosts energy density and suppresses dendrite growth for next-generation storage.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Lithium metal batteries (LMBs) offer high energy density but face challenges with electrolyte stability and dendrite formation.
- Current electrolyte optimization often uses small-molecule additives, neglecting entropy-driven interfacial effects.
- Ether-based electrolytes like LiFSI/DME show promise for high-rate LMBs due to favorable properties.
Purpose of the Study:
- To explore entropy-driven modulation of the interfacial solvation environment in LMB electrolytes using large molecular additives.
- To introduce fluorinated fullerene C60F30 (FF) as a nanoparticle additive for enhanced interfacial properties.
- To investigate the impact of FF on lithium-ion transport, solid electrolyte interphase (SEI) formation, and overall battery performance.
Main Methods:
- Addition of fluorinated fullerene C60F30 (FF) nanoparticles to LiFSI/DME electrolytes.
- Electrochemical characterization of Li||Li symmetric cells and Li||LiFePO4, Li||NCM811 cells.
- Analysis of interfacial properties, SEI composition, and Li-ion transport dynamics.
Main Results:
- FF creates a dynamically disordered interface, enhancing configurational entropy without hindering Li+ diffusivity.
- FF accelerates Li+ desolvation and transport, while cooperating with FSI- to form a robust, fluorine-rich SEI.
- Li||Li symmetric cells demonstrated stable cycling for 1500 hours; high-loading Li||LiFePO4 cells retained 96.0% capacity after 500 cycles at 2C.
Conclusions:
- Fluorinated fullerene C60F30 is an effective nanoparticle additive for improving LMB performance.
- FF enables stable, high-rate, and long-cycling operation by optimizing interfacial solvation and SEI formation.
- The FF-enabled electrolyte shows significant potential for practical, high-energy-density lithium metal battery applications.
