Transforming Retired LiFePO₄ Material toward High-Performance Cathodes for Sodium-Ion Batteries via Intermediate...

Area of Science:

• Materials Science
• Electrochemistry
• Sustainable Chemistry

Background:

• Current lithium iron phosphate battery recycling focuses on lithium extraction, discarding iron phosphate.
• This waste disposal creates environmental hazards and material loss.

Purpose of the Study:

• To develop a sustainable method for recycling iron phosphate waste from lithium iron phosphate batteries.
• To convert iron phosphate into a high-performance cathode material for sodium-ion batteries.

Main Methods:

• A two-step conversion process involving elemental compensation and phase-guided structural transformation.
• Utilizing in situ characterization to analyze reaction mechanisms and crystallization kinetics.

Main Results:

• Successfully synthesized Na3.12Fe2.44(P2O7)2 nanoparticles with uniform carbon coating from iron phosphate waste.
• Achieved exceptional capacity retention (97.5% after 800 cycles) and excellent rate performance in sodium-ion batteries.

Conclusions:

• The developed method provides an economical, simple, and scalable approach for recycling lithium iron phosphate battery waste.
• This strategy transforms waste materials into valuable products, promoting a circular economy in battery recycling.