Effect of Na+ on Li extraction from brine using LiFePO4/FePO4 electrodes

Highly Selective and Pollution‐Free Electrochemical Extraction of Lithium by a Polyaniline/LixMn2O4 Cell

“…first reported a selective electrochemical extraction of Li + ions from a Pt/λ‐MnO 2 cell, in which Li + ions can selectively insert into a spinel λ‐MnO 2 electrode with oxygen and hydrogen on a Pt electrode . In recent years, a number of studies have been conducted on the selective extraction of Li + ions from a Li x FePO 4 electrode; however, the co‐insertion of Na + and Mg 2+ ions into the FePO 4 lattice remains a problem for its practical application. Very recently, several research groups reported highly efficient electrochemical recovery of Li + ions through the use of a λ‐MnO 2 positive electrode and a chloride‐capturing negative electrode (such as Ag and Zn) .…”

“…In addition to thesem ethods, electrochemical recovery of Li + ions from aqueous solution has also attracted considerable attention.I nt he early 1990s, Kanoh et al first reported as elective electrochemical extraction of Li + ions from aP t/l-MnO 2 cell, in which Li + ions can selectively insert into as pinel l-MnO 2 electrode with oxygen and hydrogen on aP te lectrode. [12] In recent years, an umber of studies have been conductedo nt he selective extraction of Li + ions from aL i x FePO 4 electrode; [13][14][15][16][17] however,t he co-insertion of Na + and Mg 2 + ions into the FePO 4 lattice remains ap roblem for its practical application.V ery recently,s everal research groups reported highly efficient electrochemical recovery of Li + ions through the use of a l-MnO 2 positivee lectrode and ac hloride-capturing negative electrode (such as Ag and Zn). [18][19][20][21] Although these electrochemical cells can avoid the co-insertion of interfering Na + ,M g 2 + ,K + ,C a 2 + ,a nd other cations,t hey suffer from rapid capacity decay owing to the poor reversibility of the chloride-capturing negative electrodes upon use for the electrochemical uptake of chloride ions.…”

Research status in preparation of FePO4: a review

“…The iron sources for preparation of lithium iron phosphate can be divided into trivalent iron sources [18][19][20][21][22][23][24] and divalent iron sources [25,26]. Divalent iron sources are expensive and easily oxidized.…”

Electrochemical Methods for Lithium Recovery: A Comprehensive and Critical Review

“…Further studies on the cell voltage showed that the optimal voltage is 0.25 V and repeated recovery cycling could bring the final concentration of Li in the recovery solution to 62.2 × 10 −3 m . [ 77 ]…”