Regeneration of degraded lithium iron phosphate by utilizing residual lithium from spent graphite anode

With the fast development of lithium-ion batteries, there will be a lot of spent lithium iron phosphate (LFP) batteries in the near future. The loss of lithium in LFP leads to the capacity attenuation, while the lost lithium is mainly trapped in spent graphite anode. Herein, we proposed a closed-loop recycling method for spent LFP batteries, which utilizes the lithium from spent graphite to directly regenerate spent LFP through hydrothermal method. Compared with spent LFP, the repaired LFP displays enhanced electrochemical performance. This strategy tightly integrates the recycling of cathode and anode, which simplifies the recovery process and decreases the recovery cost.