Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, PR China.
J Hazard Mater. 2013 Feb 15;246-247:163-72. doi: 10.1016/j.jhazmat.2012.12.028. Epub 2012 Dec 22.
To reduce cost and secondary pollution of spent lithium ion battery (LIB) recycling caused by complicated separation and purification, a novel simplified recycling process is investigated in this paper. Removal of magnesium is a common issue in hydrometallurgy process. Considering magnesium as an important additive in LIB modification, tolerant level of magnesium in leachate is explored as well. Based on the novel recycling technology, Li[(Ni(1/3)Co(1/3)Mn(1/3))(1-x)Mg(x)]O(2) (0 ≤ x ≤ 0.05) cathode materials are achieved from spent LIB. Tests of XRD, SEM, TG-DTA and so on are carried out to evaluate material properties. Electrochemical test shows an initial charge and discharge capacity of the regenerated LiNi(1/3)Co(1/3)Mn(1/3)O(2) to be 175.4 mAh g(-1) and 152.7 mAh g(-1) (2.7-4.3 V, 0.2C), respectively. The capacity remains 94% of the original value after 50 cycles (2.7-4.3 V, 1C). Results indicate that presence of magnesium up to x=0.01 has no significant impact on overall performance of Li[(Ni(1/3)Co(1/3)Mn(1/3))(1-x)Mg(x)]O(2). As a result, magnesium level as high as 360 mg L(-1) in leachate remains tolerable. Compared with conventional limitation of magnesium content, the elimination level of magnesium exceeded general impurity-removal requirement.
为降低废旧锂离子电池（LIB）回收过程中复杂的分离和纯化带来的成本和二次污染，本文研究了一种简化的回收工艺。在湿法冶金过程中，去除镁是一个常见的问题。考虑到镁是 LIB 改性的重要添加剂，本文还探索了浸出液中镁的容忍水平。基于新型回收技术，从废旧 LIB 中制备出 Li[(Ni(1/3)Co(1/3)Mn(1/3))(1-x)Mg(x)]O(2)（0 ≤ x ≤ 0.05）正极材料。通过 XRD、SEM、TG-DTA 等测试对材料性能进行评估。电化学测试表明，再生 LiNi(1/3)Co(1/3)Mn(1/3)O(2)的初始充放电容量分别为 175.4 mAh g(-1)和 152.7 mAh g(-1)（2.7-4.3 V，0.2C）。在 1C（2.7-4.3 V）下循环 50 次后，容量保持为原始值的 94%。结果表明，镁的存在量高达 x=0.01 时，对 Li[(Ni(1/3)Co(1/3)Mn(1/3))(1-x)Mg(x)]O(2)的整体性能没有显著影响。因此，浸出液中高达 360 mg L(-1)的镁含量仍可容忍。与传统的镁含量限制相比，该方法的除镁水平超过了一般杂质去除要求。
