Cost-effective and efficient preparation of FePO4 electrodes from spent LiFePO4 batteries for enhanced lithium extraction from salt lakes
Yawen Gao (Cheng Du University of Technology)
Luxiang Ma (Cheng Du University of Technology)
Shuaifei Zhao (Deakin University)
Chunxi Hai (Cheng Du University of Technology)
Tiandong Chen (Cheng Du University of Technology)
Junyi Zhang (Cheng Du University of Technology)
Yan Zhao (Cheng Du University of Technology)
Yanxia Sun (Cheng Du University of Technology)
Shengde Dong (Cheng Du University of Technology)
Xin He (Cheng Du University of Technology)
Qi Xu (Cheng Du University of Technology)
Xiaowang Wu (Qinghai Zhongxin Guoan Lithium Development Co., Ltd.)
Caixiong Quan (Qinghai Zhongxin Guoan Lithium Development Co., Ltd.)
Hongli Su (TU Delft - Civil Engineering & Geosciences)
Yuan Zhou (Cheng Du University of Technology)
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Abstract
Cost-effective and efficient lithium extraction technology is vital to foster the growth of lithium industry. This paper proposed a novel approach for the high value utilization of spent LiFePO4 (S-LiFePO4) in the field of lithium extraction from salt lakes was proposed using spent LiFePO4 (S-LiFePO4) as raw material. The anode, made from spent LiFePO4, is prepared via a sintering process, while FePO4, obtained through chemical oxidation, is used as the cathode. Compared with commercial LiFePO4, this system not only reduces the cost but also greatly shortens the preparation time of FePO4 (only about 10min is required). And the electrochemical extraction system had a favorable lithium extraction capacity (29.25 mg/g) from actual brine, reducing the Mg/Li ratio from 61.4 to 0.8. This study not only achieved the low-cost preparation of electrode materials and facilitated the large-scale implementation of this process, but also proposed a high-value comprehensive utilization strategy for lithium-ion batteries recycling.