磷酸铁锂电池,以其耐用性而闻名,安全,和成本效益,已经成为新能源应用中必不可少的。然而,它们的广泛使用凸显了电池回收的紧迫性。管理不当可能导致资源浪费和环境危害。传统的回收方法,比如湿法冶金和火法冶金,复杂且能源密集型,导致高成本。为了应对这些挑战,本研究介绍了一种新型的低温液相法再生磷酸铁锂正极材料。通过使用N2H4·H2O作为还原剂,补充了缺失的Li+离子,和反位缺陷通过退火减少。该过程在80°C/6h恢复几乎所有丢失的Li+离子。700°C/2h高温烧结后,再生的LiFePO4在抗位点缺陷方面与商业LiFePO4相匹配,并且在1C下100次循环后表现出具有97%的容量保持率的优异性能。与高温技术相比,这种低温液相法更简单,更安全,更节能,提供回收废弃LiFePO4和类似材料的蓝图。
Lithium iron phosphate batteries, known for their durability, safety, and cost-efficiency, have become essential in new energy applications. However, their widespread use has highlighted the urgency of battery recycling. Inadequate management could lead to resource waste and environmental harm. Traditional recycling methods, like hydrometallurgy and pyrometallurgy, are complex and energy-intensive, resulting in high costs. To address these challenges, this study introduces a novel low-temperature liquid-phase method for regenerating lithium iron phosphate positive electrode materials. By using N2H4·H2O as a reducing agent, missing Li+ ions are replenished, and anti-site defects are reduced through annealing. This process restores nearly all missing Li+ ions at 80 °C/6h. After high-temperature sintering at 700 °C/2h, the regenerated LiFePO4 matches commercial LiFePO4 in terms of anti-site defects and exhibits excellent performance with a 97 % capacity retention rate after 100 cycles at 1C. Compared to high-temperature techniques, this low-temperature liquid-phase method is simpler, safer, and more energy-efficient, offering a blueprint for reclaiming discarded LiFePO4 and similar materials.