Li Hui, Fu Yutian, Liang Jinglong, Li Chenxiao, Wang Jing, Yan Hongyan, Cai Zongying
College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, China.
Materials (Basel). 2021 Nov 15;14(22):6875. doi: 10.3390/ma14226875.
With the widespread use of lithium-ion batteries, the cumulative amount of used lithium-ion batteries is also increasing year by year. Since waste lithium-ion batteries contain a large amount of valuable metals, the recovery of valuable metals has become one of the current research hotspots. The research uses electrometallurgical technology, and the main methods used are cyclic voltammetry, square wave voltammetry, chronoamperometry and open circuit potential. The electrochemical reduction behavior of Ni in NaCl-CaCl molten salt was studied, and the electrochemical reduction behavior was further verified by using a Mo cavity electrode. It is determined that the reduction process of Ni in LiNiO is mainly divided into two steps: LiNiO → NiO → Ni. Through the analysis of electrolysis products under different conditions, when the current value of LiNiO is not less than 0.03 A, the electrolysis product after 10 h is metallic Ni. When the current reaches 0.07 A, the current efficiency is 77.9%, while the Li in LiNiO is enriched in NaCl-CaCl molten salt. The method realizes the separation and extraction of the valuable metal Ni in the waste lithium-ion battery.
随着锂离子电池的广泛使用，废旧锂离子电池的累积量也逐年增加。由于废旧锂离子电池含有大量的有价金属，有价金属的回收已成为当前的研究热点之一。该研究采用电冶金技术，主要使用的方法有循环伏安法、方波伏安法、计时电流法和开路电位法。研究了NaCl-CaCl熔盐中Ni的电化学还原行为，并采用Mo腔电极进一步验证了该电化学还原行为。确定LiNiO中Ni的还原过程主要分为两步：LiNiO→NiO→Ni。通过对不同条件下电解产物的分析，当LiNiO的电流值不小于0.03 A时，10 h后的电解产物为金属Ni。当电流达到0.07 A时，电流效率为77.9%，而LiNiO中的Li富集在NaCl-CaCl熔盐中。该方法实现了废旧锂离子电池中有价金属Ni的分离和提取。
