With the goal of Carbon Peak and Carbon Neutrality proposed,new environmentally friendly energy storage de-vices have ushered in great development.Especially,lithium-ion batteries(LiB)stand out among many energy storage de-vices due to their high energy density and long service life.Lithium iron phosphate(LiFePO4)material has become the main-stream of cathode materials for electric vehicle power batteries due to its advantages of good thermal stability,high cycle times,long service time,and no memory effect.With the advent of the wave of large-scale LiFePO4 battery retirement,how to dispose of and utilize these spent batteries has become a hot issue that needs to be solved urgently at home and abroad.Based on the failure mechanism of LiFePO4 batteries,the changes of spent LiFePO4 materials before and after regeneration from both macro and micro perspectives were analyzed,and the research progress of direct recycling technology of spent LiFePO4 materials from the dimensions of lithium compensation and construction of reducing environment was reviewed.It was clearly proposed that spent LiFePO4 cathode materials were more suitable for direct regeneration,in order to realize the scientific recycling of spent LiFePO4 materials.
retired LiFePO4 batterydirect regenerationlithium repairconstruction of reducing environment
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