Research on Direct Regeneration of Retired Lithium Iron Phosphate Power Battery with Anti-fluorite Type Iron-Based Lithium-Rich Lithium Compensation Agent AITranslate

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Chinese Library Classification Number:TM912[电气工程]

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With the rapid development of the new energy vehicle industry,the resource and environmental challenges caused by large-scale retirement of power batteries have become increasingly severe.Developing green and efficient battery regeneration technologies has become an urgent industry demand.This study achieved electrochemical in-situ direct regeneration by introducing anti-fluorite type iron-based lithium-rich lithium compensation agent Li₅FeO₄(LFO)into retired lithium iron phosphate powders.The experimental results de-monstrate that in half-cell systems,LFO exhibits excellent lithium compensation effects on LiFePO₄ cathode materials with health states(SOH)of 90%,80%and 70%,increasing their charge spe-cific capacities by 63.2 mA·h/g,48.0 mA·h/g and 26.2 mA·h/g,respectively.Notably,the lithium compensation effect of LFO occurs exclusively during the first cycle stage,and its decomposition products exhibit high electrochemical stability,ensuring excellent cycling performance of regenerated batteries.Besides,full-cell tests further verify the lithium compensation capability of LFO.The discharge specific capacities of LFO-regenerated LiFePO₄ full batteries reach 141.0 mA·h/g(SOH 90%),140.6 mA·h/g(SOH 80%)and 141.1 mA·h/g(SOH 70%),respectively,comparable to that of the LiFePO₄ full battery with SOH of 100%.These results conclusively demonstrate the remarkable lithium compensation effect of LFO on LiFePO₄ cathode materials with varying SOH,providing a novel technical pathway for efficient recycling of retired power batteries.