METHOD FOR EFFICIENTLY RECOVERING POSITIVE ELECTRODE MATERIAL PRECURSOR AND LITHIUM CARBONATE FROM POSITIVE ELECTRODE WASTE MATERIAL OF LITHIUM ION BATTERY

摘要

A method for recovering a positive electrode material precursor and lithium carbonate from a positive electrode waste material of a lithium ion battery. The waste material is a positive electrode powder material containing impurities which is generated during battery production or obtained from waste batteries by means of mechanical crushing and sorting. The method comprises: carrying out leaching by using a volatile leaching agent containing a reducing agent to obtain a leachate; carrying out concentration rectification, and regenerating the volatile leaching agent; adjusting ingredients of the raffinate containing Co, Ni, Mn and Li, and carrying out coprecipitation on Co, Ni and Mn components; carrying out solid-liquid separation; and further treating the Li-rich solution to obtain high-purity lithium carbonate, and carrying out a high-temperature solid-phase reaction on the mixed material used for preparing Co, Ni and Mn precursors to obtain a positive electrode active material. The method has a simple flow and does not need a complicated impurity removal step and an extraction and enrichment process. In addition, the leaching agent may come from a wide range of sources, has high leaching selectivity and high leaching rate, and can be recycled after a leaching reaction by means of concentration rectification. Thus, the cost is reduced, and high-quality Co, Ni and Mn precursors and high-purity lithium carbonate can be obtained. The method has a good application prospect.