提出了一种利用固有Al杂质掺杂修复和升级废LFP正极材料的新方法

IF 11.2 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Resources Conservation and Recycling Pub Date : 2025-07-23 DOI:10.1016/j.resconrec.2025.108523

Haoxuan Yu , Derun Zhao , Kechun Chen , Meiting Huang , Haitao Yang , Liming Yang , Zhihao Wang , Liang Chen , Xuan Ding , Hui Lv , Xubiao Luo

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引用次数: 0

摘要

越来越多的LiFePO4 （LFP）电池退役为推进废锂离子电池（LIBs）的直接再生提供了一个独特的机会。然而，在回收的预处理过程中，集流器中存在的铝杂质给回收带来了挑战。在本研究中，我们通过利用Al杂质取代橄榄石结构中的一些阳离子位点来增强废LFP材料的直接再生过程。该方法同时实现了元素补偿和价态恢复，促进了LFP的再生，结构稳定，Li+扩散速率提高。Al掺杂后的再生LFP具有153.9 mAh g-1的初始放电容量，5℃（1℃= 170 mAh g-1）下112.1 mAh g-1的倍率性能，以及良好的循环稳定性（200次循环后的容量保持率为96.4%）。该策略引入了Al杂质的阈值，并为指导LFP材料的未来直接再生提供了机会。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

A novel method to repair and upgrade spent LFP cathode material by inherent Al impurity doping

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A novel method to repair and upgrade spent LFP cathode material by inherent Al impurity doping

The increasing retirement of LiFePO₄ (LFP) batteries provides a unique chance for advancing the direct regeneration of spent lithium-ion batteries (LIBs). However, the existence of Al impurities from current collectors during the pretreatment of recycling poses a challenge. In this study, we enhance the direct regeneration process of spent LFP material by utilizing Al impurities to replace some cationic sites in the olivine structure. This approach achieves simultaneous elemental compensation and valence restoration, promoting the regeneration of LFP with stable structure and enhanced Li⁺ diffusion rate. The regenerated LFP with Al doping exhibits an initial discharge capacity of 153.9 mAh g^-1, good rate performance with capacity of 112.1 mAh g^-1 at 5 C (1 C = 170 mAh g^-1), and excellent cycling stability (96.4 % capacity retention after 200 cycles). This strategy introduces a threshold for Al impurities and offers a chance to guide the future direct regeneration of LFP materials.

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来源期刊

Resources Conservation and Recycling 环境科学-工程：环境

CiteScore

22.90

自引率

6.10%

发文量

625

审稿时长

23 days

期刊介绍： The journal Resources, Conservation & Recycling welcomes contributions from research, which consider sustainable management and conservation of resources. The journal prioritizes understanding the transformation processes crucial for transitioning toward more sustainable production and consumption systems. It highlights technological, economic, institutional, and policy aspects related to specific resource management practices such as conservation, recycling, and resource substitution, as well as broader strategies like improving resource productivity and restructuring production and consumption patterns. Contributions may address regional, national, or international scales and can range from individual resources or technologies to entire sectors or systems. Authors are encouraged to explore scientific and methodological issues alongside practical, environmental, and economic implications. However, manuscripts focusing solely on laboratory experiments without discussing their broader implications will not be considered for publication in the journal.