Obtaining and Characterization of Highly Crystalline Recycled Graphites from Different Types of Spent Batteries

Spent batteries recycling is an important way to obtain low-cost graphite. Nevertheless, the obtaining of crystalline graphite with a rather low density of defects is required for many applications. In the present work, high-quality graphites have been obtained from different kinds of spent batteries. Black masses from spent alkaline batteries (batteries black masses, BBM), and lithium-ion batteries from smartphones (smartphone black masses, SBM) and electric and/or hybrid vehicles (lithium-ion black masses, LBM) were used as starting materials. A hydrometallurgical process was then used to obtain recycled graphites by acidic leaching. Different leaching conditions were used depending on the type of the initial black mass. The final solids were characterized by a wide set of complementary techniques. The performance as Li ion batteries anode of the sample with better structural quality was assessed.This work has been funded by the European Union′s Horizon 2020 research and innovation program under grant agreement No 776851 (CarE Service), the Spanish Ministry of Economy and Competitiveness (MINECO) under project MAT2017-84118-C2-2-R and by Banco Santander-UCM through project PR87/19-22613