Electrochemical behaviour of tin borophosphate negative electrodes for energy storage systems

Authors

Atef Y. Shenouda, Central Metallurgical Research and Development Institute, EgyptFollow
Hua-Kun Liu, University of WollongongFollow

RIS ID

24930

Publication Details

Shenouda, AY & Liu, HK (2008), Electrochemical behaviour of tin borophosphate negative electrodes for energy storage systems, Journal of Power Sources, 185(2), pp. 1386-1391.

Abstract

Tin borophosphate compounds doped with antimony, Sn₂BP_1−xSb_xO₆ (x = 0–0.3), have been prepared and studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transmission infrared spectroscopy (FTIR), electrochemical impedance spectroscopy (EIS), and cyclic voltammetry (CV) and galvanostatic measurements. XRD patterns of all the samples were indexed to the tetragonal system. The EIS showed that the conductivities are enhanced by antimony doping. It was observed that the Warburg impedance coefficient (σ_w) was 1163.265 Ω cm² s^−0.5 for the Sn₂BP_0.9Sb_0.1O₆ (x = 0.1) sample, and this was the lowest value compared to those of the other samples. Sn₂BP_0.9Sb_0.1O₆ (x = 0.1) showed the highest specific discharge capacity of 1050 mAh g⁻¹ among all the samples and a reversible capacity of 540 mAh g⁻¹ at the 150th cycle.