A novel recycling process of spent LiNi0.6Co0.2Mn0.2O2 cathode materials has been developed. The process comprises acid leaching followed by regeneration of LiNi0.6Co0.2Mn0.2O2 materials with carbonate co-precipitation. Spent LiNi0.6Co0.2Mn0.2O2 materials were effectively leached in sulfuric acid and hydrogen peroxide solution. The leaching efficiencies were 97.8% for Li, 98.1% for Ni, 96.5% for Co, and 97.0% for Mn under the optimized conditions of H2O2 concentration of 3 vol.%, sulfuric acid concentration of 3.0 mol/L, solid–liquid ratio of 20 g/L, leaching temperature of 80°C, and reaction time of 60 min. Subsequently, LiNi0.6Co0.2Mn0.2O2 cathode materials were regenerated from the leaching solution. A regenerated LiNi0.6Co0.2Mn0.2O2 cathode produced a great initial discharge capacity of 173.4 mAh g−1 at 0.1 C under a calcination temperature of 850°C. The capacity retention reached 93.6% after 100 cycles at 1 C. The novel process here would be applied in actual industrial production.

中文翻译：

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一种浸出和共沉淀回收废 Lini0.6Co0.2Mn0.2O2 阴极材料的组合方法：工艺优化和性能方面

开发了一种新的废 LiNi0.6Co0.2Mn0.2O2 正极材料回收工艺。该工艺包括酸浸，然后用碳酸盐共沉淀再生 LiNi0.6Co0.2Mn0.2O2 材料。废 LiNi0.6Co0.2Mn0.2O2 材料在硫酸和过氧化氢溶液中被有效浸出。在H2O2浓度3vol.%、硫酸浓度3.0mol/L、固液比优化条件下，Li浸出率为97.8%、Ni浸出率为98.1%、Co浸出率为96.5%、Mn浸出率为97.0% 20 g/L，浸出温度为 80°C，反应时间为 60 分钟。随后，从浸出液中再生出 LiNi0.6Co0.2Mn0.2O2 正极材料。再生的 LiNi0.6Co0.2Mn0.2O2 正极在 0.5 倍时产生了 173.4 mAh g-1 的初始放电容量。在850°C的煅烧温度下1°C。在 1 C 下循环 100 次后容量保持率达到 93.6%。这里的新工艺将应用于实际工业生产。