Titanium-doped Li3V2(PO4)3 with superhigh structural stability and intercalation rate for electrochemical extraction of lithium

With the rapid development of the new energy industry, the recovery or extraction of lithium from different resources is currently a global research hotspot. In this work, Li 3 V 2 (PO 4 ) 3 was used as the active component for electrochemical extraction of lithium from aqueous solutions. The results showed that although Li 3 V 2 (PO 4 ) 3 exhibited the reversible de-intercalation/intercalation of Li + , it suffered from severe irreversible dissolution loss in aqueous solutions. This problem was successfully solved by titanium doping. The experiments and DFT calculations showed that when the V(2)-site vanadium in Li 3 V 2 (PO 4 ) 3 was replaced by titanium, the resulting material exhibited superhigh cycle stability and lithium extraction rate. After ten cycles of de-intercalation/intercalation, the extraction capacity still reached 11.5 mg·g −1 , and the attenuation was within the error range. Particularly, because of the decrease of the band gap after doping, the electronic conductivity of the material was significantly improved, and the equilibrium time for lithium extraction was within only 5 min, which was more than 10 times faster than that of the conventional LiFePO 4 and Li 2 MnO 4 materials. This work provides a new solution for the green, efficient, and highly stable extraction of lithium from liquid lithium resources.