Synthesis of nanospherical Fe3BO6 anode material for lithium-ion battery by the rheological phase reaction method

摘要

This paper developed a novel method, the theological phase reaction method, to synthesize nanospherical Fe3BO6. The sizes and morphologies of products vary with the calcination temperatures. Spherical particles with a uniform size about 40 nm in a monodisperse state were obtained at 800 degrees C, while the spherical particles with a larger size of 100-500nm were obtained at 900 degrees C. The electrochemical properties of these Fe3BO6 nanospheres were investigated. Sample synthesized at 800 degrees C delivers a high reversible capacity above 500 mAh g(-1). Sample synthesized at 900 degrees C possesses relatively good cycleability with a capacity retaining of 376 mAhg(-1) after 10 cycles. The measurement of electrochemical impedance spectra for the first time indicated that smaller Fe3BO6 nanoparticles intend to give higher impedance of solid-electrolyte interface layer and lower charge-transfer impedance after the first discharge. Additionally, it can be speculated that the increase of resistance charge-transfer is the possible reason for the capacity fading during cycling. (C) 2008 Elsevier Inc. All rights reserved.