The vast application base of lithium-ion batteries and subsequent production will inevitably lead to a large number of spent lithium-ion batteries after their useful life. Recycling of the spent lithium-ion batteries is an essential route to safeguard the environment and to have a sustainable supply of valuable metals contained by these batteries. This paper explores two routes of recycling process (acidic leaching and baking) and compares their environmental and economic impacts along with the extraction efficiency and purity of cobalt oxalate. The paper uses Box–Behnken method to optimize operating conditions of these two routes, and polynomial equation based on the experimental data of both the routes are developed for the extraction efficiency of cobalt oxalate. Various environmental indices given in GaBi software are studied for these routes. The environmental impact (GWP 100) of these two routes are found to be 4.38 and 6.37 kg CO₂ equivalent. The optimum extraction efficiency and purity of the cobalt oxalate using acidic leaching route are found as 85.40 and 89.80%, whereas for the baking route, these values stand at 93.87 and 99.20%, respectively. Acidic leaching is found to be a greener route with an economic advantage over the acidic baking route. The acidic baking route may be used if we desire to have high purity cobalt oxalate, irrespective of its weaker economics and harsher environmental impact.

锂离子电池的广泛应用基础和后续生产将不可避免地导致大量废锂离子电池在其使用寿命之后。回收废旧锂离子电池是保护环境和可持续供应这些电池所含贵重金属的重要途径。本文探讨了两种回收方法（酸性浸提和烘烤），并比较了它们对环境和经济的影响以及草酸钴的提取效率和纯度。本文使用Box–Behnken方法优化了这两条路线的运行条件，并基于两条路线的实验数据建立了多项式方程，以提高草酸钴的提取效率。针对这些路线，研究了GaBi软件中给出的各种环境指标。₂当量。发现使用酸性浸出路线的草酸钴的最佳提取效率和纯度为85.40％和89.80％，而对于烘焙路线，这些值分别为93.87％和99.20％。发现酸性浸提是较绿色的途径，与酸性烘烤途径相比具有经济优势。如果我们希望获得高纯度的草酸钴，则可以使用酸性烘烤路线，而不论其经济性较弱和对环境的影响如何。