废锂电池放电及正极片分离回收处理

Discharge of spent lithium ion battery and separation and recovery of cathode electrode

研究了废锂电池放电及正极片分离回收处理工艺。实验结果表明:经质量浓度30 g/L NaCl溶液浸泡9.0 h可实现电池放电,残余电压在0.5 V以下;在60℃恒温水浴振荡、NaOH质量浓度40 g/L、废锂电池质量与NaOH溶液体积的比为15 g/L的优化条件下,集流体完全与活性物质分离,回收得到的黑色粉末为LiCoO2活性材料,未见铝杂质的特征峰;通过硫酸中和的方法回收碱浸溶液中的铝,当体系pH为10.0时,可获得最大量的Al(OH)3沉淀,沉淀物颗粒表面光滑,粒径大小不一。

The processes for discharging of spent lithium battery and separation and recoveryof cathode electrode were studied.The results showthat:The battery dischargecan be rapidly realized by steeping in 30 g/L NaCl solution for 9.0 h,and keep the residual voltage under 0.5 V;Under the optimal conditions of shaking in 60℃water bath,NaOH mass concentration 40 g/L,ratio of mass of spentlithium battery to NaOH solution volume15 g/L,the current collectoris separated from active substances completely,and the recovered black powder is LiCoO2 without characteristic peak of Al impurity exist;Aluminum is recovered from the alkali leaching solution by sulfuric acid neutralization,and the maximum Al(OH)3 precipitation is obtained when the system pH is 10.0.The precipitation product had smooth surface and different particle size.