Short-process simultaneously recycling cobalt and manganese from environment-hazardous di-methyl-dithiocarbamate chelate slag as lithium-ion battery cathode material

An efficient and high recovery rate short-process environment-hazardous chelate recycling method is utilized to prepare nickel-cobalt-manganese layered oxide which simultaneously recovers cobalt and manganese and not includes solvent extraction. The recovery rate of cobalt and manganese can achieve 97.68% and 96.74% respectively. The X-ray diffraction spectrum of the recycling sample shows a well-ordered layered structure, and no impurity phase is observed. The sample uses chelate slag has the same purity level and approximate electrochemical performance as the sample prepared by analytical-grade reagents. The recycling sample exhibits a high discharge capacity at 10 C rate, average capacity excesses 105 mAh.g(-1)compared to 90 mAh.g(-1) of the sample prepared by analytical-grade reagents. The capacity retention rate at 0.5 C and 1 C of the recycling sample is 82.86% and 73.14%, compared to 86.71% and 88.95% of the sample prepared by analytical-grade reagents. The capacity at 0.2 C of the recycling sample is 169.58 mAh.g(-1)compared to 159.86 mAh.g(-1) of the sample prepared by analytical-grade reagents. This article first-time reports the recycling method of chelate slag which shows a high feasibility and utilization prospect that can efficiently recycle the valuable metal elements simultaneously prepare valuable production from environment-hazardous chelate slag and alleviate the shortage of cobalt resources.

Automated summary

This study presents an efficient and high recovery rate method for recycling environment-hazardous chelate slag, which can recover cobalt and manganese simultaneously and does not involve solvent extraction. The recovery rates of cobalt and manganese are 97.68% and 96.74%, respectively. The recycling sample exhibits a well-ordered layered structure without impurity phases. It also shows similar purity level and electrochemical performance as the sample prepared by analytical-grade reagents. The recycling sample demonstrates higher discharge capacity and capacity retention rates compared to the sample prepared by analytical-grade reagents.