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Resource Recovery and Synthesis of Battery-Grade FePO 4 from Waste LiFePO 4 Battery Slag

Author

Listed:
  • Puliang Li

    (College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China
    Hunan Provincial Key Laboratory of Chemical Power Sources, College of Chemisty and Chemical Engineering, Central South University, Changsha 410083, China)

  • Yang Wang

    (College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China
    Hunan Provincial Key Laboratory of Chemical Power Sources, College of Chemisty and Chemical Engineering, Central South University, Changsha 410083, China)

  • Liying Zhu

    (Beijing Institute of Spacecraft System Engineering, Beijing 100094, China)

  • Kun Zhang

    (Beijing Institute of Spacecraft System Engineering, Beijing 100094, China)

  • Weifang Liu

    (College of Chemistry and Chemical Engineering, Hunan University of Science & Technology, Xiangtan 410082, China)

  • Tao Chen

    (College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China
    Hunan Provincial Key Laboratory of Chemical Power Sources, College of Chemisty and Chemical Engineering, Central South University, Changsha 410083, China)

  • Kaiyu Liu

    (College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China
    Hunan Provincial Key Laboratory of Chemical Power Sources, College of Chemisty and Chemical Engineering, Central South University, Changsha 410083, China)

Abstract

The effective recovery of valuable materials from spent LiFePO 4 batteries is crucial for resource sustainability and environmental protection. This study investigates the recovery of phosphorus iron slag from waste LiFePO 4 batteries, focusing on dissolution and impurity removal processes to produce battery-grade iron phosphate. Using high-temperature-activated dissolution, followed by precipitation/dissolution for impurity removal, we optimize conditions to ensure high recovery rates (up to 98.8% for FePO 4 under optimized conditions) and product purity. Our findings demonstrate that the proposed method effectively transforms waste slag into valuable iron phosphate, significantly reducing raw material costs and contributing to sustainable battery recycling practices. The regenerated LiFePO 4 cathode exhibits excellent electrochemical performance, achieving a discharge capacity of 160.7 mAh g −1 at 0.1 C, which meets market standard levels. This research provides a solid foundation for enhancing resource utilization and advancing circular economy principles in the battery industry.

Suggested Citation

  • Puliang Li & Yang Wang & Liying Zhu & Kun Zhang & Weifang Liu & Tao Chen & Kaiyu Liu, 2025. "Resource Recovery and Synthesis of Battery-Grade FePO 4 from Waste LiFePO 4 Battery Slag," Energies, MDPI, vol. 18(7), pages 1-12, April.
    • Handle: RePEc:gam:jeners:v:18:y:2025:i:7:p:1829-:d:1628201
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