Structural, Electrical and Electrochemical Properties of Fe Doped Orthosilicate Cathode Materials

Abstract

We report the paper related to the effect of Fe doping on the Li 2 Fe x Mn 1−x SiO 4 (x = 0, 0.1, 0.2, 0.3, 0.4, 0.5) cathode materials synthesized by Sol-Gel technique. X-Ray Diffraction evidences the monoclinic structure with space group Pn( 7) and crystal size decreases from 43 to 35 nm on doping Fe in Li 2 MnSiO 4 . Field emission scanning electron microscopy (FESEM) confirms that particle size reduces from 60 to 21 nm with increase of Fe concentration. The impedance analysis shows that highest electrical conductivity was 4.5 × 10 -5 Scm −1 for Li 2 Fe 0.4 Mn 0.6 SiO 4 cathode material. The initial specific capacity was 152 mAhg −1 at the rate of 0.1 C and 131 mAhg −1 after the 50th cycle with 86% capacity retention. The doping of Fe enhanced the conductivity by reducing its charge transfer resistance and increasing Li-ion diffusion coefficient than the pure Li 2 MnSiO 4 cathode material.

Sustainable carbon coated ZrO2 electrodes with high capacitance retention for energy storage devices

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