Lithium is a critical element due to its use in lithium-ion batteries, required for electric vehicles and stationary energy storage devices. Various approaches have been applied to extract it from the available resources. One of the developed lithium-capturing methods is hybrid capacitive deionization (HCDI), where the cathode is made of spinel-type material. This paper presents our study on the most effective Li, Mn, and Ti spinel-type materials, for which we analysed their structure, efficiency for lithium capturing, and energy consumption in the HCDI system. We found spinel with Li:Mn:Ti ratio of 1:3:0.15 to be the best material for lithium recovery. The natural geothermal water was applied for testing lithium recovery by HCDI equipped with the investigated material. By applying the asymmetrical electric mode, the lithium capturing efficiency reached near 80% with 8 min. The separation factors for other cations such as sodium, potassium, calcium, magnesium, and strontium were over three-times smaller.

锂是一种关键元素，因为它用于电动汽车和固定储能设备所需的锂离子电池。已经应用了各种方法来从可用资源中提取它。一种开发的锂捕获方法是混合电容去离子（HCDI），其中阴极由尖晶石型材料制成。本文介绍了我们对最有效的锂、锰和钛尖晶石型材料的研究，为此我们分析了它们的结构、锂捕获效率和 HCDI 系统中的能量消耗。我们发现 Li:Mn:Ti 比率为 1:3:0.15 的尖晶石是回收锂的最佳材料。通过配备所研究材料的 HCDI，将天然地热水用于测试锂回收。通过应用非对称电模式，锂捕获效率在 8 分钟内达到接近 80%。其他阳离子如钠、钾、钙、镁和锶的分离因子要小三倍以上。