High cyclability of ionic liquid-produced TiO 2 nanotube arrays as an anode material for lithium-ion batteries
Journal of Power Sources, ISSN: 0378-7753, Vol: 218, Page: 88-92
2012
- 55Citations
- 47Captures
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Article Description
TiO 2 nanotubes (NTs) are considered as a potential SEI-free anode material for Li-ion batteries to offer enhanced safety. Organic solutions, dominatingly ethylene glycol (EG)-based, have widely been used for synthesizing TiO 2 NTs via anodization because of their ability to generate long tubes and well-aligned structures. However, it has been revealed that the EG-produced NTs are composited with carbonaceous decomposition products of EG, release of which during the tube crystallization process inevitably causes nano-scale porosity and cracks. These microstructural defects significantly deteriorate the NTs' charge transport efficiency and mechanical strength/toughness. Here we report using ionic liquids (ILs) to anodize titanium to grow low-defect TiO 2 NTs by reducing the electrolyte decomposition rate (less IR drop due to higher electrical conductivity) as well as the chance of the decomposition products mixing into the TiO 2 matrix (organic cations repelled away). Promising electrochemical results have been achieved when using the IL-produced TiO 2 NTs as an anode for Li-ion batteries. The ILNTs demonstrated excellent capacity retention without microstructural damage for nearly 1200 cycles of charge–discharge, while the NTs grown in a conventional EG solution totally pulverized in cycling, resulting in significant capacity fade.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S0378775312011068; http://dx.doi.org/10.1016/j.jpowsour.2012.06.096; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84864819734&origin=inward; https://linkinghub.elsevier.com/retrieve/pii/S0378775312011068; https://dx.doi.org/10.1016/j.jpowsour.2012.06.096
Elsevier BV
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