A layer-built rechargeable lithium ribbon-type battery for high energy density textile battery applications

Abstract

We designed a novel layer-built rechargeable lithium ribbon-type battery intended for textile or cloth based applications. The ribbon-type battery, 2.4 mm (or 1 mm) wide and 10 cm long, is composed of a double layer LiFePO₄ cathode and an amorphous silicon nanofilm. The double layer LiFePO₄ and amorphous silicon electrodes were prepared using the doctor blade method and a vertical deposition technique, respectively. The structure and morphology of the LiFePO₄ and the silicon thin film were characterized by Rietveld refinement, SEM and TEM. At room temperature the ribbon-type battery exhibited an initial discharge capacity of 166.4 and 132.7 mA h g⁻¹ at 0.5 and 1 C-rate, respectively. A reasonably good cycling performance and high coulombic efficiency under the high current density of 1 C-rate could be obtained with the Si/LiFePO₄ ribbon-type battery. Also, a high volumetric capacity of 336 mA h cm⁻³ at 0.5 C-rate was achieved, which makes the ribbon-type battery suitable for practical use.