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<p>Recycling waste lithium iron phosphate (LFP) batteries is crucial for reducing reliance on natural resources, minimizing environmental pollution. A selective leaching method for Li extraction from LiFePO<sub>4</sub> is proposed using D-tartaric acid and H<sub>2</sub>O<sub>2</sub>. The investigation focused on evaluating the impact of various parameters including tartaric acid concentration, H<sub>2</sub>O<sub>2</sub> dosage, solid–liquid (S–L) ratio, and reaction temperature and time on the leaching efficiencies (LE). Under optimal conditions, specifically, 1&#xa0;M D-tartaric acid, 1&#xa0;mL H<sub>2</sub>O<sub>2</sub>, an S–L ratio of 80&#xa0;g/L, temperature of 75°C, and reaction time of 30&#xa0;min, the LE of lithium reached 99.12%. The kinetic analysis of lithium leaching indicated that the process conformed most closely to the conforms to the Avrami model, with activation energies (<i>E</i><sub>a</sub>) calculated at 73.79&#xa0;kJ/mol. To verify these findings, experiments were conducted on industrial waste LFP black powder, achieving a lithium leaching rate of over 99%. This study presents a clean and cost-effective method for lithium recovery by employing inexpensive and biodegradable organic acids. Furthermore, it offers a straightforward and efficient approach for processing industrial spent LFP black powder.</p>

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Recovery of Lithium from Spent LiFePO4 Cathodic Powders Through Tartaric Acid as a Leachant

  • 期刊论文

  • 发表日期：

    2025年3月27日

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  • Wenwen Li,
  • Siqi Liu,
  • Haomin Wang,
  • Zhiqiang Fang,
  • Hao Jiang,
  • Ning Huang,
  • Qingfei Meng,
  • Guoqing Wang

摘要

Recycling waste lithium iron phosphate (LFP) batteries is crucial for reducing reliance on natural resources, minimizing environmental pollution. A selective leaching method for Li extraction from LiFePO4 is proposed using D-tartaric acid and H2O2. The investigation focused on evaluating the impact of various parameters including tartaric acid concentration, H2O2 dosage, solid–liquid (S–L) ratio, and reaction temperature and time on the leaching efficiencies (LE). Under optimal conditions, specifically, 1 M D-tartaric acid, 1 mL H2O2, an S–L ratio of 80 g/L, temperature of 75°C, and reaction time of 30 min, the LE of lithium reached 99.12%. The kinetic analysis of lithium leaching indicated that the process conformed most closely to the conforms to the Avrami model, with activation energies (Ea) calculated at 73.79 kJ/mol. To verify these findings, experiments were conducted on industrial waste LFP black powder, achieving a lithium leaching rate of over 99%. This study presents a clean and cost-effective method for lithium recovery by employing inexpensive and biodegradable organic acids. Furthermore, it offers a straightforward and efficient approach for processing industrial spent LFP black powder.