Trend AnalysisChemistry & Materials

Battery Recycling: Urban Mining for Lithium, Cobalt, and Nickel

By 2030, over 11 million tonnes of spent lithium-ion batteries will require recycling annually. These batteries contain critical metals (lithium, cobalt, nickel, manganese) at concentrations many time...

By Sean K.S. Shin
This blog summarizes research trends based on published paper abstracts. Specific numbers or findings may contain inaccuracies. For scholarly rigor, always consult the original papers cited in each post.

The Question

By 2030, over 11 million tonnes of spent lithium-ion batteries will require recycling annually. These batteries contain critical metals (lithium, cobalt, nickel, manganese) at concentrations many times higher than natural ores โ€” true "urban mines." Yet current recycling rates remain below 5% globally. Three competing technologies โ€” pyrometallurgy (smelting), hydrometallurgy (chemical leaching), and direct recycling (cathode regeneration) โ€” each have different economic, environmental, and technical profiles. Which approach can scale to meet the coming wave of EV battery retirements?

Landscape

Z. Lu et al. (2025) reviewed the full landscape of spent LIB recycling technologies, comparing pyrometallurgical, hydrometallurgical, and emerging approaches. They identified that retired EV batteries exhibit strategic resource concentrations โ€” metal concentrations several times higher than natural ores โ€” making recycling not just environmentally necessary but economically attractive at sufficient scale. However, the heterogeneity of battery chemistries (NMC111, NMC532, NMC811, LFP) complicates standardised processing.

Zanoletti et al. (2025) introduced solvometallurgy โ€” using alternative solvents such as deep eutectic solvents (DES) and low-melting mixtures instead of aqueous acids โ€” as a greener alternative to hydrometallurgy. These solvents achieve selective metal dissolution at lower temperatures with reduced acid waste generation. Their review positioned solvometallurgy between the energy intensity of pyrometallurgy and the chemical waste of hydrometallurgy.

C. Li et al. (2025) reviewed direct cathode regeneration โ€” re-lithiating and restoring the crystal structure of spent cathode materials without dissolving them. This approach preserves the material's morphology and avoids the energy cost of re-synthesis, but requires careful sorting of cathode chemistries before processing.

Y. Xie et al. (2025) demonstrated cross-sector upcycling: converting spent graphite anodes into photothermal catalysts for PET plastic recycling. This creative approach addresses two waste streams simultaneously and illustrates the circular economy potential of spent battery materials beyond simple metal recovery.

Key Claims & Evidence

<
ClaimEvidenceVerdict
Spent LIBs contain metals at concentrations several times higher than natural oresSystematic analysis of battery composition vs. ore grades (Z. Lu et al. 2025)Confirmed; urban mining economics improve with scale
Solvometallurgy reduces acid waste vs. hydrometallurgyOrganic solvent leaching at lower temperatures (Zanoletti et al. 2025)Demonstrated; solvent recyclability is key to economics
Direct cathode regeneration preserves material valueRe-lithiation restores crystal structure without dissolution (C. Li et al. 2025)Supported; chemistry-specific sorting required
Cross-sector upcycling creates additional valueSpent graphite โ†’ PET recycling catalyst (Y. Xie et al. 2025)Creative proof-of-concept; scalability unclear

Open Questions

  • LFP recycling economics: LFP batteries contain no cobalt or nickel. Is recycling LFP economically viable when lithium prices are low?
  • Battery passport: Can digital battery passports (tracking chemistry, health state, manufacturing data) enable more efficient sorting and recycling?
  • Design for recycling: Should battery manufacturers be required to design packs for easier disassembly and material recovery?
  • Closed-loop supply chains: Can battery-to-battery recycling achieve the purity levels needed for new cathode synthesis without virgin material dilution?
  • Referenced Papers

    • [1] Lu, Z. et al. (2025). Critical Pathways in Spent LIB Recycling Technologies. Materials, 18(13), 2987. DOI: 10.3390/ma18132987
    • [2] Zanoletti, A. et al. (2025). Solvometallurgy as Alternative for LIB Black Mass Processing. Materials, 18(12), 2761. DOI: 10.3390/ma18122761
    • [3] Li, C. et al. (2025). Recycling and regeneration of failed layered oxide cathode materials. Materials Horizons. DOI: 10.1039/d4mh01803f
    • [4] Praลพanovรก, A. et al. (2025). Optimized Thermal Treatment for Sustainable Pyrometallurgy. ChemSusChem. DOI: 10.1002/cssc.202501753
    • [5] Xie, Y. et al. (2025). Upcycling Spent Graphite into Photothermal Catalysts for PET Recycling. Adv. Sci. DOI: 10.1002/advs.202510772

    References (5)

    Lu, Z., Ning, L., Zhu, X., & Yu, H. (2025). Critical Pathways for Transforming the Energy Future: A Review of Innovations and Challenges in Spent Lithium Battery Recycling Technologies. Materials, 18(13), 2987.
    Zanoletti, A., Mannu, A., & Cornelio, A. (2025). Solvometallurgy as Alternative to Pyro- and Hydrometallurgy for Lithium, Cobalt, Nickel, and Manganese Extraction from Black Mass Processing: State of the Art. Materials, 18(12), 2761.
    Li, C., Zeng, W., Wang, J., Li, Z., Zhang, J., Wang, X., et al. (2025). Recycling and regeneration of failed layered oxide cathode materials for lithium-ion batteries. Materials Horizons, 12(12), 4065-4091.
    Praลพanovรก, A., Koฤรญ, J., Uล™iฤรกล™, J., Pilnaj, D., Stroe, D., & Knap, V. (2025). Optimized Thermal Treatment of Lithiumโ€Ion Battery Components as a Basis for Sustainable Pyrometallurgy. ChemSusChem, 18(24).
    Xie, Y., Qiu, M., Jiao, B., Xu, P., Cao, M., Zhang, Q., et al. (2025). Upcycling Spent Graphite Anodes into Bifunctional Photothermal Catalysts for Efficient PET Chemical Recycling. Advanced Science, 12(45).

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