材料科学
格子(音乐)
离子
化学工程
同种类的
动能
阴极
石墨
扩散
纳米技术
工艺工程
热力学
复合材料
物理化学
化学
有机化学
物理
量子力学
声学
工程类
作者
Zihao Zeng,Panpan Xu,Jiexiang Li,Chenxing Yi,Wenqing Zhao,Wei Sun,Xiaobo Ji,Yue Yang,Peng Ge
标识
DOI:10.1002/adfm.202308671
摘要
Abstract Captured by the remarkable environmental/economic value, recycling spent LiFePO 4 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.
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