Abstract
All-solid-state batteries were fabricated by assembling a layer of self-organized TiO2 nanotubes grown on as anode, a thin-film of polymer as an electrolyte and separator, and a layer of composite LiFePO4 as a cathode. The synthesis of self-organized TiO2 NTs from Ti-6Al-4V alloy was carried out via one-step electrochemical anodization in a fluoride ethylene glycol containing electrolytes. The electrodeposition of the polymer electrolyte onto anatase TiO2 NTs was performed by cyclic voltammetry. The anodized Ti-6Al-4V alloys were characterized by scanning electron microscopy and X-ray diffraction. The electrochemical properties of the anodized Ti-6Al-4V alloys were investigated by cyclic voltammetry and chronopotentiometry techniques. The full-cell shows a high first-cycle Coulombic efficiency of 96.8% with a capacity retention of 97.4% after 50 cycles and delivers a stable discharge capacity of 63 μAh cm−2 μm−1 (119 mAh g−1) at a kinetic rate of C/10.
Highlights
Lithium-ion batteries (LIBs) have attracted great interest as excellent reversible energy storage devices due to their high energy density, low self-discharge, long cycle life, and several other benefits [1,2]
Among the various nanostructured oxide materials, special attention has been directed to TiO2 nanotubes (TiO2 NTs) because they have been already explored for many applications such as solar cells [9,10,11], sensors [12,13], photocatalysis [14,15,16], and rechargeable batteries [17,18]
We report the fabrication of an all-solid-state battery consisting of TiO2 NTs synthesized from ternary titanium alloy (Ti-6Al-4V, with 6 wt% aluminum and 4 wt% vanadium) alloy as an anode, a thin layer of polymer electrolyte, and an LiFePO4 layer as a cathode
Summary
Lithium-ion batteries (LIBs) have attracted great interest as excellent reversible energy storage devices due to their high energy density, low self-discharge, long cycle life, and several other benefits [1,2]. Titanium dioxide (TiO2 ) has been considered as a good candidate as an anode material for LIBs due to its superior performances such as a low volume change of less than 4% during the reversible insertion of lithium ions, having a theoretical capacity of ca. One-dimensional (1D) TiO2 materials have been developed as anodes for LIBs such as nanotubes, nanowires, nanorods, etc. Among the various nanostructured oxide materials, special attention has been directed to TiO2 nanotubes (TiO2 NTs) because they have been already explored for many applications such as solar cells [9,10,11], sensors [12,13], photocatalysis [14,15,16], and rechargeable batteries [17,18]. The TiO2 NTs materials have been extensively studied as anode material, thanks to the high surface-to-volume ratio leading to the enhanced electrochemical properties [19]
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