The widespread application of Lithium-ion Batteries (LIBs) has led to a significant increase in the number of spent LIBs. Consequently, the recycling and utilization of spent LIBs have become an inevitable choice for recovering valuable resources and protecting the environment, aligning with the principles of sustainable development. This study reports an iron air battery recycling system that is capable of recovering both Li/Co and energy from spent LiCoO2 cathode materials and the separation reaction is completely spontaneous. Meanwhile, lithium and cobalt were successfully recovered from the powdered leach solution of spent LiCoO2 cathode material, and it was preliminarily demonstrated that spent iron could be used as a sacrificial anode for the system. Several key parameters affecting recovery are optimized, including anode solution pH, discharge current density, and concentration of the solution to be recovered. Under the conditions of anode solution pH of 1.8, discharge current density of 0.1 mA cm−2, and concentration of recovery solution of 0.15 mol/L, the system can be operated stably for more than 24 h, and the recoveries of Li+ and Co2+ can be up to 1.49 mg h−1 and 18.75 mg h−1 respectively, and the output energy can reach 75.15 kJ/mol. This research not only provides a sustainable and cost-effective method of disposing of used lithium-ion batteries, but also offers up new possibilities for the disposal of scrap iron.

中文翻译：

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通过铁空气电池回收废旧锂离子电池中的 Li/Co


锂离子电池 （LIB） 的广泛应用导致废旧锂离子电池的数量显着增加。因此，废锂离子电池的回收利用已成为回收宝贵资源和保护环境的必然选择，符合可持续发展的原则。本研究报道了一种铁空气电池回收系统，该系统能够从废的 LiCoO2 正极材料中回收 Li/Co 和能量，并且分离反应是完全自发的。同时，从废 LiCoO2 正极材料的粉末浸出液中成功回收锂和钴，初步证明废铁可以用作系统的牺牲阳极。优化了影响回收率的几个关键参数，包括阳极溶液 pH 值、放电电流密度和待回收溶液的浓度。在负极溶液 pH 为 1.8、放电电流密度为 0.1 mA cm−2、回收液浓度为 0.15 mol/L 的条件下，系统可稳定运行超过 24 h，Li+ 和 Co2+ 的回收率分别可达 1.49 mg h−1 和 18.75 mg h−1，输出能量可达 75.15 kJ/mol。这项研究不仅提供了一种可持续且具有成本效益的废旧锂离子电池处理方法，还为废铁的处理提供了新的可能性。