title: Bio-solid-State processes for synthesis of Li-Fe-phosphate.
abstract: Lithium-Fe-phosphates have become of great interest as storage cathodes for rechargeable Li-batteries because of their high density, environmental friendliness, and safety. The objective of this study was to examine bio-solid-state synthesis of LiFePO4 by microbial processes at room temperature. The microbial reduction of Fe(III)-citrate using an organic carbon, glucose, as an electron donor in the presence of NaHPO4 and lithium that resulted in the formation of Li-substituted iron phosphate. Our studies showed that bacteria enriched from inter-tidal flat sediments, designated as Haejae-1, synthesized Li-substituted iron phosphate. Characterization by X-ray diffraction showed the reduction of Fe(III)-citrate in the presence of NaHPO4 and LiCl2 resulted in the precipitation of Li-substituted vivianite [Li(x)Fe(3-x)(PO4)2 x 8H2O]. SEM-EDX, FTIR, and ESCA analyses showed the chemical composition of the synthesized phases was Li, Fe, P, C, and O. Based on the chemical and physical structure of the mineral, the novel bio-nano-material may be potentially useful to the development of energy storage materials.
authors.affiliation: School of Earth and Environmental Sciences, Seoul National University, Seoul 151-742, Korea.
authors.forename: Hyoung-Bum
authors.initials: HB
authors.lastname: Kim
authors.forename: Byungno
authors.initials: B
authors.lastname: Park
authors.forename: Insung
authors.initials: I
authors.lastname: Lee
authors.forename: Yul
authors.initials: Y
authors.lastname: Roh
mesh_terms: D007501:Iron / Q000737:chemistry*; D008094:Lithium / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D010710:Phosphates / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D014961:X-Ray Diffraction
chemical_list: D010710:Phosphates; D008094:Lithium; D007501:Iron