Advanced Characterization and Rejuvenation of End‐Of‐Life Lithium‐Ion Anodes: Toward the Development of a Green Upcycling Route

Why It Matters

The approach provides a low‑cost, environmentally friendly pathway to extend battery life and reduce waste, accelerating circularity in the EV supply chain.

Key Takeaways

• DI water removes graphite surface impurities effectively
• Ascorbic acid offers comparable regeneration with greener chemistry
• Rejuvenated anodes achieve 2.65 mAh/cm² capacity
• Capacity exceeds fresh and end‑of‑life benchmarks
• X‑ray tomography quantifies microstructural recovery

Pulse Analysis

The rapid growth of electric vehicles has intensified pressure on existing battery‑end‑of‑life solutions, which largely rely on hydrometallurgical processes that consume significant energy and generate hazardous waste. Industry stakeholders are therefore seeking shorter‑loop, low‑impact methods that can reclaim valuable electrode materials while minimizing environmental footprints. By focusing on the anode—a component traditionally overlooked in recycling strategies—researchers address a critical gap, positioning green chemistry as a viable complement to conventional metal recovery.

In the study, deionized water and ascorbic acid served as benign solvents to strip surface contaminants and restore the graphite architecture of spent anodes. Advanced imaging techniques, such as three‑dimensional X‑ray tomography, captured the evolution of pore networks and crystallographic orientation before and after treatment. Electrochemical testing showed that the treated electrodes maintained a discharge capacity of approximately 2.65 mAh per square centimeter across twenty cycles, outperforming both unused and degraded counterparts. These results underscore the efficacy of simple aqueous chemistries in delivering performance gains without the need for complex re‑manufacturing steps.

The implications extend beyond laboratory validation. A scalable, solvent‑based rejuvenation route could reduce reliance on energy‑intensive smelting, lower recycling costs, and keep critical carbon‑based materials in circulation. Moreover, the integration of high‑resolution tomography provides a diagnostic toolkit for monitoring material health throughout the reuse cycle. As automotive manufacturers and battery producers prioritize sustainability metrics, such green upcycling pathways are poised to become integral components of a circular battery economy, supporting regulatory compliance and consumer demand for greener mobility solutions.