Cadmium-incorporated Li2FeSiO4/C composites have been successfully synthesized by a solid-state reaction assisted with refluxing. The effect and mechanism of Cd-modification on the electrochemical performance of Li2FeSiO4/C were investigated in detail by X-ray powder diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, Raman spectra, transmission electron microscopy, pos...

Nanostructured lithium metal orthosilicate materials hold a lot of promise as next generation cathodes but their full potential realization is hampered by complex crystal and electrochemical behavior. In this work Li2FeSiO4 crystals are synthesized using organic-assisted precipitation method. By varying the annealing temperature different structures are obtained, namely the monoclinic phase at ...

The high-pressure optical floating-zone method enables single crystal growth of the Pmnb high-temperature phase Li2FeSiO4. influence conditions on quality, homogeneity, and impurity formation in Li2FeSiO4 is studied. use different starting materials, i.e., either P121/n1 or Pmn21 polymorph, as well optimization various investigated. Several mm3-sized high-quality crystals are obtained by choice...

Olivine-structured lithium iron silicate is one of the promising cathodes for development high energy ion batteries. This article describes synthesis phase-pure mesoporous Li2FeSiO4/C nanocomposite particles by a modified sol–gel processing via alkoxide route. Controlled polymerization Si mediated partial hydrolysis in conjunction with copolymerization Fe precursors chelated citric acid minimiz...

The reaction between an uncharged Li2FeSiO4 (LFS) cathode and a LiPF6-EC/DMC electrolyte is revealed by in situ XANES in coin cells. This study shows clear evidence of delithiation and iron oxidation in LFS prior to cycling. Subsequent cycling appears to partially restore the original lithiation level, an observation that needs to be taken into consideration in future LFS development work.

The polyanion cathodes for Li-ion batteries, namely LiFePO4, Li2FeP2O7 and Li2FeSiO4, were synthesized by very short high-temperature treatment (approximately several minutes) subsequent quenching. Methylcellulose—a polymer with thermally driven water solubility—was used as the medium in which precursor solutions dispersed prior to high temperature treatment. methylcellulose pyrolytically decom...

The structure with Pmn21 space group suggested by Nytén et al. [24] for Li2FeSiO4 was used as the initial structure for all DFT calculations. In order to perform the Li2M0.5N0.5SiO4 assessment, one unit cell of Pmn21 structure with one atom of M and one atom of N was assumed. Fig. S1 illustrates considered Li2Mn0.5Ni0.5SiO4 structure as an example. In order to obtain total energies, magnetic st...

Lithium iron orthosilicate (Li2FeSiO4) with Pmn21 space group is theoritically investigated as a chathode material of Li-ion batteries using density functional theory (DFT) calculations. PBE-GGA (+USIC), WC-GGA, L(S)DA (+USIC) and mBJ+LDA(GGA) methods under spin-polarization ferromagnetic (FM) and anti-ferromagnetic (AFM) procedure are used to investigate the material properties, includin...