Lithium embedded hierarchically porous aluminium phosphonate as anode material for lithium-polymer battery

Abstract

Crystalline porous nanomaterials having large surface area and exchangeable cation sites are very useful for high mobility of Li-ions, which is the key for developing an efficient energy storage material. Herein, we have reported a novel organic-inorganic hybrid hierarchically porous aluminium phosphonate (AlPIm) material through the polycondensation of Al(III) with an organophosphorus precursor iminodi(methylphosphonic acid) under hydrothermal reaction conditions without using any structure-directing agent. Lithium immobilization over aluminium phosphonate yields LiAlPIm, which showed excellent electrochemical property of a freestanding anode for the lithium polymer battery. AlPIm and LiAlPIm materials were characterized through several instrumental tools i.e. PXRD, N-2-sorption, FE-SEM, TEM, XPS, FT-IR spectroscopy and thermogravimetric analysis. Due to high BET surface area and nanoscale porosity, Li-ion transportation was facilitated and thus LiAlPIm anode material displayed high specific discharge capacity of 238 mA h g(-1) together with an outstanding retention stability in the lithium-polymer battery.