Electrochemical recovery of lithium from brine by highly stable truncated octahedral LiNi0.05Mn1.95O4

Lithium extraction from salt lakes has become a hot research issue in recent years, and LiMn 2 O 4 -based electrochemical lithium extraction is considered to be one of the most promising technologies for application. However, LiMn 2 O 4 limits its further application due to the dissolution of Mn and the Jahn-Teller effect. In this study, a LiNi 0.05 Mn 1.95 O 4 (LNMO-0.05) lithium-extraction electrode material with truncated octahedral characteristics was prepared. The special crystal surface structure enhanced the diffusion and adsorption rates of Li + , whereas Ni doping effectively suppressed the Jahn-Teller effect, and the two mechanisms synergistically enhanced the lithium extraction performance of LMO. In lithium extraction from East Taijiner brine with an Mg/Li ratio of 46, LNMO-0.05 showed excellent ion selectivity (α Mg-Li  = 214.08), high lithium extraction capacity (20.99 mg/g) and no significant capacity decay occurred after 10 cycles. These excellent properties make the LNMO-0.05 electrode suitable for industrial electrochemical lithium extraction.