本研究以處理廢棄軟包鋰三元電池正極材料為目標，建立一套可回收並再生鋰/鈉三元正極材料之整合流程，本研究主要分為四個部分，以下詳細敘述之。
第一部分為廢棄鋰電池之前處理與正極材料之特性分析，本研究先對廢電池進行放電最適化，結果顯示於1 mol/L 之氯化鈉水溶液中放電240分鐘並搭配超音波震盪處理，可達最適化放電條件。完成放電後，透過剪切開封、極片分離、機械破碎與過篩，取得金屬材料正極粉末，材料分析顯示其金屬組成含鈷約16.38%、鎳約29.15%、錳約14.95%，其主要晶相以LiNi1/3Co1/3Mn1/3O2層狀結構為主，繞射峰可歸屬於六方晶格α-NaFeO2型結構。
第二部分為金屬溶出階段，由於單純以無機酸進行金屬浸漬之效率較不理想，故本研究透過加入雙氧水作為還原劑，使溶出效果顯著提升。於最佳化條件1 mol/L HCl、10 vol.% H2O2、液固比50 ml/g、反應溫度55℃及反應時間120分鐘下，鋰、鈷、鎳、錳之浸漬效率皆可提升至95%以上。
由於酸浸過程後會有雜質金屬溶出，因此以溶媒萃取程序進行溶液分離純化。以Ionquest 801搭配LIX984N混合系統去除銅、鋁離子，於平衡pH值5、3 vol.% LIX984N、3 vol.% Ionquest 801、油水比0.5及萃取時間10分鐘下，雜質金屬去除率分別為銅100%、鋁99.99%。
接著，第四部份為再生階段，去除雜質之過渡金屬溶液於本研究中透過共沉澱法結合固相燒結成功製備為鋰/鈉三元正極材料。為確保資源循環過程後之正極材料具有應用價值，故將再生三元系統電池進行電化學驗證。結果顯示:再生鋰三元電池在1C/1C條件下，其首圈放電容量為137.48 mAh/g，100次後為94.22 mAh/g，容量保持率約68.5%。另一方面，再生鈉三元電池於1C/1C條件下首圈放電容量約111 mAh/g，100次後約95 mAh/g，容量保持率約86%。
整體而言，本研究結果證實：可將高效率金屬回收、選擇性雜質去除與正極材料再合成加以整合，並可進一步實現跨化學體系的再利用途徑，將廢棄鋰系正極材料導向再製成鋰/鈉系三元正極材料。

The primary feedstock in this study was spent Li-based ternary cathode material (NMC111). After dismantling and calcination to remove conductive carbon and polymeric binders, acid leaching was carried out using hydrochloric acid in the presence of hydrogen peroxide, yielding a mixed leachate containing dissolved metal ions including Cu, Al, Mn, Ni, Co, and Li. Subsequently, a synergistic solvent-extraction process using a mixed extractant system of LIX984N and Ionquest 801 was applied to remove Al and Cu from the metal-rich solution, and the loaded organic phase was stripped with 3 mol/L HCl to recover Cu and Al. The purified raffinate was then subjected to co-precipitation using sodium hydroxide and ammonium hydroxide to simultaneously precipitate Ni, Co, and Mn, forming a Ni–Co–Mn hydroxide precursor. Lithium was recovered from the co-precipitation filtrate via carbonate precipitation by adding sodium carbonate, producing lithium carbonate. The obtained precursor was mixed with the recovered lithium source and subsequently calcined at high temperature to synthesize regenerated Li-based ternary cathode materials. In parallel, part of the recovered metal products was also utilized for the fabrication of Na-ion battery cathodes; by regulating the Na-to-transition-metal ratio, Na-based ternary cathode materials were successfully obtained.

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