par Mahanta, Vivekananda 
;Kwok, Wing Ching ;Ramasamy, Deepika Lakshmi ;Venkatesan, Prakash
Référence Desalination, 621, page (119721)
Publication Publié, 2026-01-01
;Kwok, Wing Ching ;Ramasamy, Deepika Lakshmi ;Venkatesan, Prakash Référence Desalination, 621, page (119721)
Publication Publié, 2026-01-01
Article révisé par les pairs
| Résumé : | Electrochemical lithium-ion pumping (ELIP) systems have emerged as a promising alternative for selective lithium extraction, offering advantages such as high purity, low energy consumption, and minimal environmental impact. In this study, we optimized the LiFePO4/FePO4 (LFP/FP)-based symmetrical ELIP system to enhance lithium extraction performance from aqueous solutions. A major limitation in traditional LFP/FP electrodes is their hydrophobic nature, which leads to poor electrolyte-electrode interaction, prone to oxygen reduction reaction and chemical oxidation, resulting rapid capacity degradation. To address these issues, we developed hydrophilic LFP/FP electrodes using a chitosan binder, which significantly improved wettability and interfacial stability, supressing the parasitic reactions. With the hydrophilic LFP/FP electrodes, excellent cycling stability (∼100 % capacity retention after 50 cycles) was achieved. Further, with 30 % conductive carbon content, the system achieved nearly a high capacity-utilization of ∼108 mAh g−1 (∼28 mg of Li+ g−1 of LFP) at a high current density of 10 mA g−1. The optimized ELIP system demonstrated an energy consumption of ∼4.14 Wh mol−1, the lowest reported among symmetric lithium extraction cells. These findings underscore the potential of hydrophilic electrode design and operating parameter optimization in advancing electrochemical lithium extraction technologies. |
