Large‐Scale and Homogenized Strategies of Spent LiFePO₄ Recycling: Reconstruction of Targeted Lattice

Abstract

Captured by the remarkable environmental/economic value, recycling spent LiFePO4 has attracted numerous attention. However, restricted by diverse failure mechanisms and different particle‐sizes/active‐sites, recycling strategies still suffer from uneven repairing results and poor accessibility. For promoting their application in commercial systems, the uniform physical‐chemical properties are urgent for regenerated samples. Herein, by tailoring oxidation‐reduction manners, the homogeneous cathode materials can be prepared, displaying uniform particle size and restored lattice. The capacity of as‐optimized samples can be kept ≈141.5 mAh g−1 at 1.0 C, and 137 mAh g−1 with a retention of 92% after 300 cycles at 2.0 C. After Kg‐scale experiments, the pouch full‐cell (LFP‐500 vs recovered graphite) delivers ≈4200 mAh capacity, with considerable cycling stability (retention 96.83%, after 500 loops). Importantly, the detailed mechanism of oxidation/reduction‐conditions is investigated, especially their lattice reconstitution and ions‐ diffusion behaviors. Supported by kinetic analysis and DFT calculations, the fascinating stability of LFP‐500 is further proved, mainly derived from the accelerated Li‐diffusion behaviors. Compared to traditional recovering manners, oxidation/reduction process displays low cost, energy‐consumption, and pollution, accompanied with considerable large‐scale application potential. Given this, this work is anticipated to illustrate the in‐depth mechanism of lattice‐reconstruction, while offering significant strategies for large‐scale and homogenized regeneration.

High performance of regenerated LiFePO4 from spent cathodes via an in situ coating and heteroatom-doping strategy using amino acids

“…S5 †), signaling the structural evolution and phase separation of S-LFP. 27 In addition, transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM) were utilized to further reveal the microstructural disparities between S-LFP and regenerated LFP. As shown in Fig.…”

Comprehensive Technology for Recycling and Regenerating Materials from Spent Lithium Iron Phosphate Battery

“…Modification is an effective repair method to improve the interface properties and structural stability of spent LFP material. ,, It usually enhances the electrochemical performances by carbon coating or ion doping. LFP material has low electrical conductivity (10 –9 –10 –10 cm 2 /s), so commercial LFP material is modified by carbon coating.…”

A Highly Efficient Additive for Direct Reactivation of Waste LiFePO4 with Practical Electrochemical Performance

“…Direct recycling is a more comprehensive recycling method to recycle waste LiFePO 4 batteries. Through the treatment and repair of the waste LiFePO 4 , it is restored to the usable state and then put into use again . This method can maximize the service life of the batteries and reduce the demand for new batteries.…”

“…Through the treatment and repair of the waste LiFePO 4 , it is restored to the usable state and then put into use again. 11 This method can maximize the service life of the batteries and reduce the demand for new batteries. Smelting recovery and wet recovery are all by recycling the important metals in waste lithium iron phosphate separately, which greatly hinders the effective recovery of waste LiFePO 4 batteries.…”