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Recycling of Lithium Iron Phosphate Batteries: Future Prospects and Research Needs

Since the first synthesis of lithium iron phosphate (LFP) as active cathode material for lithium-ion batteries (LIB) in 1996, it has gained a considerable market share and further growth is expected. Main applications are the fast-growing sectors electromobility and to a lesser extend stationary energy storage. Despite increasing return flows, so far, little emphasis has been put on the recycling of LFP batteries due to the low content of high-value metals. In this study, current developments in the LFP battery market are presented. Furthermore, recycling processes for LIBs are reviewed and their applicability for LFP batteries is assessed. Currently, China is the main market for LFP batteries and rapidly increasing return flows are observed. In Europe and the USA, other battery chemistries are predominant. For LFP battery recycling, individually adaptable processes based on mechanical treatment of the cells followed by hydrometallurgical processing of the active cathode material seem to be the most promising approach. However, at present, these processes are only available at pilot scale, the profitability and their environmental performance are questionable. Therefore, further research addressing these challenges is urgently needed.