Green Synthesis of Pseudocoherent Fluoride Cathode Materials from Wastes

Area of Science:

• Materials Science
• Electrochemistry
• Sustainable Chemistry

Background:

• Transition metal fluorides (TMFs) are promising cathode materials for lithium-ion batteries due to their high energy density.
• Current synthesis methods for TMFs are often complex, toxic, and lack durability, limiting their practical application.

Purpose of the Study:

• To develop a green and sustainable synthesis strategy for high-performance iron fluorides (FeFx) cathode materials.
• To utilize recycled materials and ambient conditions for fluoride synthesis.

Main Methods:

• A mechanochemical ball-milling process was employed at ambient conditions (35 °C).
• Recycled polytetrafluoroethylene was used as the fluorine source, combined with iron powder.
• The synthesis involved a coupling reaction between pseudocoherent FeFx and semi-ionic CFy.

Main Results:

• The synthesized FeFx-CFy cathode exhibited an impressive capacity of 240.0 mAh g⁻¹.
• The material demonstrated excellent cycling stability, retaining 76.2% of its capacity after 2000 cycles at 1C.
• Performance surpassed that of conventional LiNi0.8Co0.1Mn0.1O2 and LiFePO4 cathodes.

Conclusions:

• This work presents a sustainable and environmentally friendly method for producing high-value fluoride materials.
• The developed FeFx-CFy cathode offers a promising alternative for advanced lithium-ion batteries.
• The strategy contributes to waste recycling by utilizing discarded polytetrafluoroethylene.