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Structural evolution of layered oxide cathodes for spent Li-ion batteries:Degradation mechanism and repair strategy

SusMat 2023年第3期3卷 362-378页

作者： Shan Jin Jianquan Liang Deying Mu Tianning Lin Yuyang Tian Jian Zhang YueWang Meng Chen Qingmo Shi Changsong Dai MIIT Key Laboratory of CriticalMaterials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbinChina State Grid Heilongjiang Electric Power Co. Ltd.Electric Power Research InstituteHarbinChina Dongying Cospower Technology Co. Ltd.DongyingChina

Sustainable development has long been recognized as one of the most critical issues in today’s energy and environment-conscious *** has never been more urgent to recycle and reuse the end-of-life cathode ***,this work systematically investigates the structure-critical degradation mechanism of polycrystalline LiNi_(x)Co_(y)Mn_(1−x−y)O_(2)(NCM),combining experimental characterization and DFT *** the key degradation factors,a synergistic repair strategy based on deep mechanochemical activation and heat treatment was successfully proposed to direct regenerate the *** indicate the induction and promotion of synergistic repair technique on the reconstruction of particlemorphology,the recovery of the chemical composition and crystal structure,and the favorable transformation of the impurities phase in the failed *** particular,the synergistic repair process induces a gradient distribution of LiF and further enables partial fluorine doping into the NCM surface,forming abundant oxygen vacancies and increasing the content of highly reactive Ni2+.Benefiting from the comprehensive treatment for the multi-scale and multi-form degradation behaviors,the repaired material exhibits a capacity of 176.8 mA h g^(-1)at 0.1 C,which is comparable to the corresponding commercial material(172.8 mA h g^(-1)).The satisfactory capacity of the recovered cathode proves that it is an effective direct renovating strategy.

关键词： cathode material degradation mechanism impurity phase transformation spent lithium-ion batteries synergistic repair strategy

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