Synthesis, characterization and electrochemical performance of $$\hbox {Li}_{2}\hbox {Ni}_{x}\hbox {Fe}_{1-x}\hbox {SiO}_{4}$$ Li 2 Ni x Fe 1 - x SiO 4 cathode materials for lithium ion batteries

Abstract

Li 2 Ni x Fe 1−x SiO 4 (x = 0, 0.2, 0.4, 0.6, 0.8 and 1) samples were prepared by a sol-gel process. The crystal structure of prepared samples of Li 2 Ni x Fe 1−x SiO 4 was characterized using an X-ray diffractometer. Different crystallographic parameters such as crystallite size and lattice cell parameters have been calculated. Scanning electron microscopy and Fourier transform infrared spectroscopy investigations were carried out, which reveal the morphology and function groups of the synthesized samples. Furthermore, electrochemical impedance spectra measurements are performed. The obtained results indicated that the highest conductivity is achieved for the Li 2 Ni 0.4 Fe 0.6 SiO 4 electrode compound. It was observed that Li-Li 2 Ni 0.4 Fe 0.6 SiO 4 battery has initial discharge capacity of 164 mAh g −1 at 0.1C rate. The cycle life performance of all Li 2 Ni x Fe 1−x SiO 4 batteries ranged between 100 and 156 mAh g −1 with coulombic efficiency range between 70.9 and 93.9%.

Fast 3D-lithium-ion diffusion and high electronic conductivity of Li2MnSiO4 surfaces for rechargeable lithium-ion batteries

“…According to the literature, ve different structures were observed with Li 2 FeSiO 4 , [16][17][18][19] three assynthesized (two are orthorhombic, Pmnb and Pmn2 1 ; one is monoclinic, P2 1 /n) and two cycled phases (Pmn2 1 cycled and P2 1 /n cycled). Similarly, multiple phases have been reported for Li 2 MnSiO 4 2,13,20,21 with two orthorhombic (Pmn2 1 and Pmnb) and one monoclinic (P2 1 /n) symmetries; Li 2 CoSiO 4 [22][23][24] has two orthorhombic (Pnb2 1 and Pmn2 1 ) and one monoclinic (P2 1 /n) symmetries, while Li 2 NiSiO 4 3,25,26 has one crystal symmetry. The structural, electronic and electrochemical properties of Li 2 MSiO 4 depend on the distributions of M. The density functional theory (DFT) predicted some parameter variations, for instance, cell, volume and voltage intercalations between intermediate phases (Li 2 MSiO 4 , LiMSiO 4 and MSiO 4 ) based on their crystal symmetry.…”

Phase transformation and photoelectrochemical characterization of Cu/Bi and Cu/Sb based selenide alloys as promising photoactive electrodes

“…scitation.org/journal/adv charge transfer, mass transport, phase transitions. 37,38 Therefore, Fig. 6(a) shows the Nyquist plots of the fabricated CBSe and CASe dye-sensitized photoelectrochemical cells (PECs) in the dark.…”

Novel mixed heterovalent (Mo/Co)Ox-zerovalent Cu system as bi-functional electrocatalyst for overall water splitting

“…Therefore, utilizing low-cost, clean, and efficient energy technologies are one of the targets to achieve sustainable developments for future generations 2 , 3 . Electrochemical energy storage and conversion systems such as fuel cells, batteries, and water electrolyzers are currently promising alternatives for the aforementioned world crisis 4 – 9 . Actually, all these systems principally depend on renewable resources such as solar energy.…”