Capacitive deionization (CDI) is proposed to be one of the most promising techniques for removal of charged species from brackish water. In this work, a robust CDI electrode is designed by synthesizing Li₃VO₄ on reduced graphene oxide (LVO/rGO) to extract Li⁺ with enhanced capacity. The LVO/rGO exhibits the orthorhombic-phase crystal structure. Further, as compared to pure LVO, the optimized LVO/rGO composite realizes the improved specific surface area (SSA) and electrochemical performance. It is suggested that the aggregation of rGO can be alleviated by coupling with LVO, resulting in high SSA. Meanwhile, the LVO provides a large number of active sites to intercalate Li⁺. Benefiting from this structure, the LVO/rGO ‖ Activated carbon (AC) device demonstrates high Li⁺ extraction capacity of ~39.53 mg/g in LiCl solution with an initial concentration of 610.42 mg/L under the cell voltage of 1.2 V, which is the highest among the reported data. Moreover, the Li⁺ extraction behavior of LVO/rGO ‖ AC in various electrolytes containing OH^– and Cl⁻ is explored, illustrating that the AC electrode has priority in Cl⁻ and thus leading to high Li⁺ removal capacity. Beyond that, the Li⁺ removal capacity of the LVO/rGO-20 electrode after 20 cycles is measured as ~30.84 mg/g, which is 78.02% of the initial value.

电容去离子（CDI）被认为是从微咸水中去除带电物质的最有前途的技术之一。在这项工作中，通过在还原的氧化石墨烯（LVO / rGO）上合成Li ₃ VO ₄来提取具有增强容量的Li ⁺，从而设计了一种坚固的CDI电极。LVO / rGO具有正交相晶体结构。此外，与纯LVO相比，优化的LVO / rGO复合材料可实现改善的比表面积（SSA）和电化学性能。建议通过与LVO偶联可以减轻rGO的聚集，从而导致较高的SSA。同时，LVO提供了大量的活性位点以嵌入Li ⁺。受益于这种结构，LVO / rGO‖活性炭（AC）装置在1.2 V电池电压下的LiCl溶液中具有约39.53 mg / g的高Li ⁺萃取容量，初始浓度为610.42 mg / L。报告的数据中最高的。此外，锂⁺在含有OH各种电解质LVO / RGO‖AC的萃取行为^-和Cl ^-进行了探讨，其示出了AC电极在CL具有优先权^-并且因此导致高的Li ⁺去除能力。除此之外，测量20个循环后LVO / rGO-20电极的Li ⁺去除能力为〜30.84 mg / g，这是初始值的78.02％。