Bioinspired Injection Therapy for Spent LiFePO₄ Batteries: A Non-Invasive Strategy for Capacity Regeneration and...

Area of Science:

• Materials Science
• Electrochemistry
• Sustainable Energy

Background:

• Lithium iron phosphate (LFP) batteries are widely deployed, but their disposal presents significant challenges due to rapidly increasing volumes.
• Current LFP battery regeneration methods are complex, energy-intensive, and difficult to scale, hindering efficient and economical solutions.

Purpose of the Study:

• To develop a novel, non-invasive strategy for direct capacity rejuvenation of spent LFP batteries.
• To address the limitations of existing regeneration techniques by proposing an energy-efficient and cost-effective approach.

Main Methods:

• A non-invasive injection therapy inspired by medical procedures is used to introduce recovery reagents into spent LFP batteries, avoiding disassembly.
• The I₃^-/I^- redox couple is employed to activate residual lithium on the graphite anode and re-engineer the solid electrolyte interphase (SEI).
• Restored lithium from the anode is utilized to replenish lithium deficits and rectify Li-Fe antisite defects in the LFP cathode.

Main Results:

• Regenerated LFP pouch cells exhibited remarkable recovery of electrochemical capacity.
• The strategy led to superior kinetics performance and significantly extended cycle life for the batteries.
• The method demonstrated an energy-efficient and cost-effective pathway for LFP battery regeneration.

Conclusions:

• This pioneering strategy offers a transformative approach to sustainable practices in lithium-ion battery reuse.
• The non-invasive regeneration technique effectively prolongs the service life and enhances the practical applications of LFP batteries.
• The study presents a viable solution for managing the growing challenge of retired LFP battery disposal.