Regeneration cathode material mixture from spent lithium iron phosphate batteries
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Cathode materials mixture (LiFePO4/C and acetylene black) is recycled and regenerated by using a green and simple process from spent lithium iron phosphate batteries (noted as S-LFPBs). Recovery cathode materials mixture (noted as Recovery-LFP) and Al foil were separated according to their density by direct pulverization without acid/alkali leaching for the first time. Subsequently, Recovery-LFP is further directly regenerated with solid state reaction and reused for lithium ion battery without adding acetylene black at the first time. Compared with recovery material, regeneration cathode materials mixture (noted as regeneration-LFP) displays excellent electrochemical performances, which delivers a discharge capacity of 129.43 mAh g−1 in the first and maintains 120.32 mAh g−1 with a high capacity retention rate of 92.96% after 1000 cycles at 0.5C through 18,650 battery testing. It is concluded that the regeneration material can be reused as cathode materials for lithium batteries.
This work was supported by the Natural Science Foundation of China (Grant Number 51371198); and the Natural Science Foundation of Hunan provincial (Grant Number 2017JJ2168).
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Conflict of interest
The authors declare there is no conflicts of interest regarding the publication of this paper.