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Direct Regeneration of Spent LiFePO4 Cathode Material by a Green and Efficient One-Step Hydrothermal Method
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-11-25 , DOI: 10.1021/acssuschemeng.0c07166 Qiankun Jing 1 , Jialiang Zhang 1, 2 , Yubo Liu 1 , Wenjuan Zhang 1, 2 , Yongqiang Chen 1, 2 , Chengyan Wang 1, 2
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-11-25 , DOI: 10.1021/acssuschemeng.0c07166 Qiankun Jing 1 , Jialiang Zhang 1, 2 , Yubo Liu 1 , Wenjuan Zhang 1, 2 , Yongqiang Chen 1, 2 , Chengyan Wang 1, 2
Affiliation
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The environmentally friendly and low-cost recycling of spent LiFePO4 (LFP) cathode material has become an urgent problem. Herein, a green and effective one-step hydrothermal approach was proposed for the direct regeneration of spent LFP. LFP will lose part of its lithium and convert into FePO4 (FP) during long-term cycles. Thus, a supplement of lost lithium is essential to regenerate spent LFP, and this is thermodynamically feasible to achieve under hydrothermal conditions. The hydrothermal conditions of temperature, Li+ concentration, and reductant dosage were investigated. It was found that enhancement of hydrothermal conditions was beneficial to supplementing lithium, correspondingly improving the electrochemical performance. Under the hydrothermal conditions of 200 °C for 3 h, 12 g L–1 of Li+, L/S = 6 mL g–1, and 1.0 mL of reductant (for every 5 g of spent LFP), the regenerated LFP displayed excellent discharge capacities of 146.2 mAh g–1 at 0.2 C, 141.9 mAh g–1 at 1 C, and 128.2 mAh g–1 at 5 C. Additionally, the capacity retention reached up to 98.6% after 200 cycles at 1 C. This regeneration method has been demonstrated to be of good economic benefit and energy savings, which will provide technological support for the sustainable development of the LIBs industry.
中文翻译：
绿色高效的一步水热法直接再生废LiFePO 4阴极材料
废LiFePO 4（LFP）阴极材料的环保，低成本回收已成为迫在眉睫的问题。在此，提出了一种绿色且有效的一步热液法，用于废LFP的直接再生。LFP将失去其部分锂，并在长期循环中转化为FePO 4（FP）。因此，补充失去的锂对于再生用过的LFP是必不可少的，这在水热条件下在热力学上是可行的。温度的水热条件，Li +研究浓度和还原剂用量。发现水热条件的改善有利于补充锂，相应地改善了电化学性能。在200°C的水热条件下持续3 h，使用12 g L –1的Li +，L / S = 6 mL g –1和1.0 mL的还原剂（每5 g废LFP），显示出再生的LFP出色的放电容量，在0.2 C下为146.2 mAh g –1，在1 C下为141.9 mAh g –1和128.2 mAh g –1 此外，在1 C下经过200次循环后，容量保持率达到了98.6％。这种再生方法已被证明具有良好的经济效益和节能效果，这将为LIB工业的可持续发展提供技术支持。 。
更新日期：2020-12-07
中文翻译：
绿色高效的一步水热法直接再生废LiFePO 4阴极材料
废LiFePO 4（LFP）阴极材料的环保，低成本回收已成为迫在眉睫的问题。在此，提出了一种绿色且有效的一步热液法，用于废LFP的直接再生。LFP将失去其部分锂，并在长期循环中转化为FePO 4（FP）。因此，补充失去的锂对于再生用过的LFP是必不可少的，这在水热条件下在热力学上是可行的。温度的水热条件，Li +研究浓度和还原剂用量。发现水热条件的改善有利于补充锂，相应地改善了电化学性能。在200°C的水热条件下持续3 h，使用12 g L –1的Li +，L / S = 6 mL g –1和1.0 mL的还原剂（每5 g废LFP），显示出再生的LFP出色的放电容量，在0.2 C下为146.2 mAh g –1，在1 C下为141.9 mAh g –1和128.2 mAh g –1 此外，在1 C下经过200次循环后，容量保持率达到了98.6％。这种再生方法已被证明具有良好的经济效益和节能效果，这将为LIB工业的可持续发展提供技术支持。 。
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