A New Method Of Recalmation Of Element Co From Discarded Lithium Batteries

Due to high energy density, low gravity and good performance, Li ion battery has received much attention in recent years and occupies about80%percent in the market of electronic portable devices. However, it should be pointed out that the abandoned battery wastes have become serious problems for the environment, which is poisonous for human being’s health. Even worse, China is lack of Cobalt element, which is indispensable raw material for Li battery. It is important and significant to realize the recycle use of Li battery, which could not only ease the pollution to the environment but also mean much for the sustainable development for a country.Most waste of abandoned Li battery are A1、 LiCoO2, and few are C and Fe elements, among which Ni elements occupies3%o. In the process of solubilization, few purities such as Ca and Mg elements were unexpectedly introduced to the solution. Although the contents of Ni elements lower than5‰has little effect on the performance of Li battery, the existence of Ca, Mg and Al do influence the charge capacity of batteries and structure of crystals. In this paper, we concentrated on the elimination of Al, Ca, Ma and Fe elements and preparation of Cobalt carbonate and Co3O4.The waste elements Fe, Al and Ca, Mg were eliminated from discarded lithium batteries by fractional and adsorption precipitation method respectively. Element analysis results demonstrated that theproducts met with the requirements of electronic standards. Then Powder CoC03was obtained by homogeneous precipitation. Final product Co3O4was then achieved by calcinations. Scanning electron microscopy images and granularity analysis demonstrate particle size of Co3O4ranges from7to10μm at600℃. Our results show that temperature plays predominant role in the shape and size of CoCO3and Co3O4.