Direct Regeneration of LiFePO₄Cathode Material of Retired Power Battery Using Lithium Compensation Reagent Li₅AlO₄ AITranslate

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Chinese Library Classification Number:TM912[电气工程]

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In order to reduce the formation of by-products during direct lithium compensation to regenerate the retired lithium iron phosphate(LiFePO₄)cathode material and improve the controllability and application value of the process,the regeneration effect of Li₅AlO₄(LAO)as lithium compensation reagent on the retired lithium iron phosphate cathode material was discussed.The phase structure and morphology of LAO were characterized using X-ray diffractometer(XRD)and scanning electron microscope(SEM),and its electrochemical performance was evaluated.The performance of LiFePO₄regenerated with LAO was also investigated in both half-cells and full-cells.The results indicate that LAO can effectively release lithium ions,and compensate the depleted lithium in the degraded cathode material,thereby significantly enhancing its specific capacity and cycling stability.Half-cell testing shows that for degraded LiFePO₄batteries with state of health(SOH)of 90%,80%and 70%,the first-cycle charge specific capacities after lithium compensation with LAO increase to 301.5 mA·h/g,272.4 mA·h/g and 358.7 mA·h/g,respectively,indicating a significant improvement compared to the samples without LAO.After 500 charge-discharge cycles,the capacity retention rates of the above batteries after lithium compensation with LAO are 94.0%,90.1%and 95.9%,respectively,which fully proves that the lithium compensation strategy has minimal impact on the cycling stability of the batteries.Furthermore,full-cell testing further validates the direct regeneration effect of LAO as a lithium compensation reagent for retired battery cathode materials.In particular,for the batteries with a SOH of 80%,the addition of LAO increases the first-cycle charge specific capacity by 46.1 mA·h/g,demonstrating its effectiveness in lithium compensation.These findings further confirm the potential of LAO in the regeneration of LiFePO₄batteries.The efficient lithium compensation strategy with LAO proposed in this study provides crucial theoretical support and technical reference for the regeneration and recycling of LiFePO₄batteries.