Improved electrochemical performance of natural honeycomb templated LiSbO3 as an anode in lithium-ion battery

LiSbO3 has been synthesized by wet-chemical route using natural honeycomb as template, followed by thermal treatment at 850 degrees C. X-ray powder diffraction (XRD) confirms a single phase material having an orthorhombic crystal structure with lattice parameters of a = 4.912 angstrom, b = 8.679 angstrom and c = 5.089 angstrom. Field emission scanning electron microscopy (FESEM) revealed that while conventional LiSbO3 synthesized without using any template (C-LiSbO3) consists of softly agglomerated clusters of bar-shaped multifaceted micrometer-sized grains (0.5-4.0 mu m long and 0.5-1.0 mu m wide). templated LiSbO3 (T-LiSbO3) consists of an agglomeration-free morphology with discrete cubic shaped particles of sizes 40-80 nm. Electrochemical investigation in 2032 type coin cells vs Li/Li+ shows that Li insertion in LiSbO3 takes place at 0.78 V while Li extraction occurs in two stages at 1.1 and 1.4V with initial capacities of 178 and 196 mAh g(-1) for C-LiSbO3 and T-LiSbO3 respectively. While C-LiSbO3 shows a drastic capacity fading retaining only 28% of initial capacity after 100 cycles, T-LiSbO3 retains similar to 48% of the initial capacity due to the faceted morphology of the nanoparticles. (C) 2011 Elsevier B.V. All rights reserved.