Abstract
Highlighted by the safe operation and stable performances, titanium oxides (TiO2) are deemed as promising candidates for next generation lithium-ion batteries (LIBs). However, the pervasively low capacity is casting shadow on desirable electrochemical behaviors and obscuring their practical applications. In this work, we reported a unique template-assisted and two-step atomic layer deposition (ALD) method to achieve TiO2@Fe2O3 core-shell nanotube arrays with hollow interior and double-wall coating. The as-prepared architecture combines both merits of the high specific capacity of Fe2O3 and structural stability of TiO2 backbone. Owing to the nanotubular structural advantages integrating facile strain relaxation as well as rapid ion and electron transport, the TiO2@Fe2O3 nanotube arrays with a high mass loading of Fe2O3 attained desirable capacity of ~520 mA h g−1, exhibiting both good rate capability under uprated current density of 10 A g−1 and especially enhanced cycle stability (~450 mA h g−1 after 600 cycles), outclassing most reported TiO2@metal oxide composites. The results not only provide a new avenue for hybrid core-shell nanotube formation, but also offer an insight for rational design of advanced electrode materials for LIBs.
Highlights
Highlighted by the safe operation and stable performances, titanium oxides (TiO2) are deemed as promising candidates for generation lithium-ion batteries (LIBs)
The sacrificial template of Co2(OH)2CO3 nanowire arrays were firstly synthesized on Ti foils through a hydrothermal reaction
An outmost layer of Fe2O3 was uniformly grown intimately onto the double-side of TiO2 nanotube architectures with thickness controllable synthesis precisely regulated by atomic layer deposition (ALD) cycles
Summary
Highlighted by the safe operation and stable performances, titanium oxides (TiO2) are deemed as promising candidates for generation lithium-ion batteries (LIBs). We present a binder-additive-free TiO2/Fe2O3 core-shell nanotubular arrays as high performance electrode through a unique method combining hydrothermal and stepwise atomic layer deposition (ALD) First of all, this 3D nanotubular architecture leads to a much larger surface area with adequate electrolyte penetration and direct 1D pathway for electron transport with neighboring space to accommodate volumetric change of electrode materials[3,26,27]. With the optimal effect of Fe2O3 coating, hybrid electrode exhibits outstanding electrochemical performance with especially outstanding cycle stability (~450 mA h g−1 after 600 cycles) and superb rate capability (up to 10 A g−1 charging), demonstrating great potential as excellent anode alternative for high performance LIBs
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