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Direct Recycling Strategy for Spent Lithium Iron Phosphate Powder: an Efficient and Wastewater-Free Process
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2022-08-24 , DOI: 10.1021/acssuschemeng.2c03520 Guorong Hu 1 , Yifan Gong 1 , Zhongdong Peng 1 , Ke Du 1 , Min Huang 1 , Jiahui Wu 1 , Dichang Guan 1 , Jingyao Zeng 1 , Baichao Zhang 1 , Yanbing Cao 1
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2022-08-24 , DOI: 10.1021/acssuschemeng.2c03520 Guorong Hu 1 , Yifan Gong 1 , Zhongdong Peng 1 , Ke Du 1 , Min Huang 1 , Jiahui Wu 1 , Dichang Guan 1 , Jingyao Zeng 1 , Baichao Zhang 1 , Yanbing Cao 1
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Due to its high safety and long cyclic life, the LiFePO4 (LFP) battery has received numerous attention and has been widely used in electric vehicles. Therefore, it is urgent to develop advanced technology to recycle spent LFP batteries to avoid energy exhaustion and protect the environment. Here, we report a direct regeneration strategy for spent LFP powder based on the wet full-component leaching method and traditional LFP production process. Specifically, combined leaching of spent LFP powder using H3PO4 and citric acid was done; meanwhile, the leaching solution is used as the precursor to regenerate LFP cathode materials by a typical LFP spray-drying process. The recovery rates of Li, Fe, and P were above 95%. Effective separation of Al elements could be realized by pretreatment of LFP with a low concentration of LiOH solution, and the Al removal rate can reach 89%. The LFP material regenerated through prealuminum removal demonstrated excellent electrochemical properties, with a discharge capacity of 123.3 mA h g–1 at a rate of 5 C. After 600 cycles at 1 C, its capacity retention was found to be as high as 97.3%. Moreover, the economic benefit analysis indicates that the progress is rewarding. This novel and simple method has made a breakthrough in the limitations of traditional LFP-recovery process, eliminating the complicated chemical precipitation process. Meanwhile, it realizes the direct recovery of LFP and eliminates wastewater at the origin, which is expected to be widely used in industry.
中文翻译：
废磷酸铁锂粉末的直接回收策略：一种高效且无废水的工艺
LiFePO 4 (LFP) 电池因其高安全性和长循环寿命而受到众多关注，并已广泛应用于电动汽车。因此，迫切需要开发先进的技术来回收废旧磷酸铁锂电池，以避免能源枯竭和保护环境。在这里，我们报告了一种基于湿法全组分浸出法和传统 LFP 生产工艺的废 LFP 粉末的直接再生策略。具体而言，使用 H 3 PO 4联合浸出废磷酸铁粉柠檬酸做完了；同时，浸出液作为前驱体，通过典型的LFP喷雾干燥工艺再生LFP正极材料。Li、Fe、P的回收率均在95%以上。低浓度LiOH溶液预处理LFP可实现Al元素的有效分离，Al去除率可达89%。通过预铝去除再生的 LFP 材料表现出优异的电化学性能，放电容量为 123.3 mA hg –1在 5 C 的速率下。在 1 C 下循环 600 次后，发现其容量保持率高达 97.3%。此外，经济效益分析表明，进展是有回报的。这种新颖简单的方法突破了传统LFP-回收工艺的局限性，消除了复杂的化学沉淀工艺。同时实现了磷酸铁锂的直接回收，从源头杜绝了废水，有望在工业中得到广泛应用。
更新日期：2022-08-24
中文翻译：
废磷酸铁锂粉末的直接回收策略：一种高效且无废水的工艺
LiFePO 4 (LFP) 电池因其高安全性和长循环寿命而受到众多关注，并已广泛应用于电动汽车。因此，迫切需要开发先进的技术来回收废旧磷酸铁锂电池，以避免能源枯竭和保护环境。在这里，我们报告了一种基于湿法全组分浸出法和传统 LFP 生产工艺的废 LFP 粉末的直接再生策略。具体而言，使用 H 3 PO 4联合浸出废磷酸铁粉柠檬酸做完了；同时，浸出液作为前驱体，通过典型的LFP喷雾干燥工艺再生LFP正极材料。Li、Fe、P的回收率均在95%以上。低浓度LiOH溶液预处理LFP可实现Al元素的有效分离，Al去除率可达89%。通过预铝去除再生的 LFP 材料表现出优异的电化学性能，放电容量为 123.3 mA hg –1在 5 C 的速率下。在 1 C 下循环 600 次后，发现其容量保持率高达 97.3%。此外，经济效益分析表明，进展是有回报的。这种新颖简单的方法突破了传统LFP-回收工艺的局限性，消除了复杂的化学沉淀工艺。同时实现了磷酸铁锂的直接回收，从源头杜绝了废水，有望在工业中得到广泛应用。
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