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First Fung''s CMK-3 product debuted in Adv. Energy Mater., used for pre-lithiation
2022/4/29 11:03:08

On March 20, 2022, the team of Academician Wan Lijun from the Institute of Chemistry of the Chinese Academy of Sciences creatively proposed a recycling strategy for in-situ electrochemical regeneration using a functionalized lithium-supplemented separator (FPS). A regenerative battery was assembled with a chemical separator, a failed LFP pole piece and a new graphite anode. After the first cycle of activation, the electrochemical performance was remarkably recovered, realizing the direct reuse of the entire waste LFP cathode piece. The related work is entitled "In Situ Electrochemical Regeneration of Degraded LiFePO4 Electrode with Functionalized Prelithiation Separator" was published in the journal Advanced Energy Materials.

The team adopted a combination of liquid phase blending and recrystallization to reduce the particle size of lithium oxalate (Li2C2O4) while introducing ordered mesoporous carbon (CMK) with high specific surface area (greater than 800 m2 g-1) and good electrical conductivity -3), Li2C2O4/CMK-3 composites with reduced decomposition potential (4.3v) were successfully prepared, which reduced the decomposition voltage of Li2C2O4 to about 4.3V and obtained an irreversible capacity of over 500 mA h g-1. Then the Li2C2O4/CMK-3 homogeneous slurry was prepared, and the casting process was used to prepare the FPS. The functionalized prefabricated layer with a thickness of about 25 μm was uniformly coated on the commercial separator (19 μm), and finally based on the failed LFP, lithium oxalate separator and new graphite After the first cycle of activation, the regenerated battery of the negative electrode can exhibit considerable capacity recovery and good long-cycle stability. This novel, simple, and cost-effective strategy opens up a new avenue for direct regeneration of spent LFP batteries and broadens the horizons of overall Li-ion battery recycling.

The main material CMK-3 used in this paper is from XFNANO.

Literature link: https://doi.org/10.1002/aenm.202103630

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