A green chemistry process has been developed to recycle cathode material from end-of-life lithium ion batteries. NCM111 (LiNi1/3Co1/3Mn1/3O2) was completely leached with 13 M formic acid to produce two groups of salts with different solubilities: sparingly soluble cobalt, manganese, and nickel (CMN) formates and highly soluble lithium formate. During leaching, CMN formate salts exceeded their solubility limit in the pregnant leach solution (PLS) and crystallized. Mixed CMN formate salts were recovered by filtering the PLS. Lithium was completely recovered by evaporating the filtered PLS then thermally decomposing the lithium formate obtained in air to lithium carbonate. The purity of the lithium carbonate was 98.1 wt%.

中文翻译：

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一种零液体放电工艺，用于从报废锂离子电池的废 NCM111 正极材料中回收所有关键金属：使用甲酸和原位结晶进行统计优化的浸出


已经开发了一种绿色化学工艺，用于从报废锂离子电池中回收阴极材料。NCM111 （LiNi1/3Co1/3Mn1/3O2） 用 13 M 甲酸完全浸出，生成两组溶解度不同的盐：微溶性钴、锰和镍 （CMN） 甲酸盐和高溶性甲酸锂。在浸出过程中，CMN 甲酸盐在妊娠浸出液 （PLS） 中超过其溶解度极限并结晶。通过过滤 PLS 回收混合的 CMN 甲酸盐。通过蒸发过滤后的 PLS，然后将在空气中获得的甲酸锂热分解为碳酸锂来完全回收锂。碳酸锂的纯度为 98.1 wt%。