Presented work deals with the problem of separating lithium and magnesium from brines. A similar size of ionic radius characterizes the Li⁺ and Mg²⁺; hence, separating these elements could be problematic. The hybrid capacitive deionization (HCDI) with lithium‑manganese‑titanium oxides was employed as a potential process for separating lithium and magnesium ions from aqueous solutions. During the investigation, the thermodynamics factors were determined. The enthalpy of activation, the entropy of activation and the Gibbs energy of activation for accumulation Li⁺ and Mg²⁺ by Eyring-Polanyi and energy activation by Arrhenius equations were calculated for explanation the separation phenomenon. Next, the HCDI for binary and multicomponent solutions were conducted. The critical role in achieving high β_Li/Mg plays the activity coefficient of the initial feed, and the value of a voltage applied in constant voltage electric mode. With the increasing value of brines' activity coefficient, the separation factor β_Li/Mg lift when the concentration of lithium ions decreases. HCDI with LMTO material adsorbed lithium ions with β_Li/Mg at 2.14 and released Li⁺ with over 70% efficiency. The proposed HCDI process employed LMTO sorptive material could be considered a potential method for separating lithium and magnesium from lithium sources.

提出的工作涉及从盐水中分离锂和镁的问题。^{Li +}和 Mg ²⁺的离子半径大小相似；因此，分离这些元素可能是有问题的。锂锰钛氧化物的混合电容去离子（HCDI）被用作从水溶液中分离锂和镁离子的潜在工艺。在调查期间，确定了热力学因素。^{Li +}和 Mg ²⁺积累的活化焓、活化熵和吉布斯活化能通过 Eyring-Polanyi 和 Arrhenius 方程的能量激活计算来解释分离现象。接下来，进行了二元和多组分溶液的 HCDI。实现高 β _Li/Mg的关键作用在于初始进料的活性系数，以及在恒压电动模式下施加的电压值。随着卤水活度系数值的增大，锂离子浓度降低时，分离因子β _Li/Mg升高。具有 LMTO 材料的 HCDI在 2.14 时以 β _Li/Mg吸附锂离子并释放 Li ⁺效率超过 70%。所提出的采用 LMTO 吸附材料的 HCDI 工艺可被认为是从锂源中分离锂和镁的潜在方法。