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Manufacturing and electrochemical characterization of freestanding TiO2 nanotube electrodes for lithium-ion batteries
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Inorganic Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Inorganic Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Inorganic Chemistry.
2016 (English)Conference paper, Poster (with or without abstract) (Other academic)
Abstract [en]

Microelectronic systems are continuously developed towards smaller and smaller devices which increase the demands on the energy and power densities of the batteries that are used to power the devices. As the size of the electronic components decreases the foot print area available for the surface mounted batteries becomes a limiting factor. These high demands on the energy and power densities make three-dimensional (3D) lithium-ion microbatteries a promising alternative while traditional thin film lithium-ion batteries are less suitable [1, 2] as it is difficult to obtain both high energy and power densities for this type of batteries. The 3D microbatteries can, on the other hand, provide high energy densities per footprint area as well as high power densities thanks to the short diffusion paths and increased mass loading when compared to thin film batteries [1, 3, 4].

It is well-known that self-assembled freestanding TiO2 nanotubes with a hexagonal structure can be synthesized through an anodization of titanium foil in a fluoride containing electrolyte [5]. This 3D structure can then be annealed to convert the as-formed amorphous TiO2 to anatase. Such annealed nanotubes can readily be used as binder-free anode material for lithium-ion batteries. The high capacity per footprint area and good cycling stability of the TiO2 nanotubes make them suitable for applications in 3D microbatteries [3].

In this work TiO2 nanotubes of different lengths from 4.5 to 40 µm have been synthesized through a two-step anodization process. The material properties of the nanotubes have been analysed with scanning electron microscopy and X-ray diffraction and the electrochemical performances of nanotubes of different lengths have been evaluated, using galvanostatic cycling and cyclic voltammetry in cells containing lithium-foil counter electrodes. The rate limiting factors during the lithiation and delithiation at high cycling rates have been studied for different tube lengths in addition to the cycling stability of nanotubes with different lengths.

 

References

  1. Roberts M., Johns P., Owen J., Brandell D., Edström K., Enany G. E., Guery C., Golodonitsky D., Lacey M., Lecoeur C., Mazor H., Peled E., Perre E., Shaijumon M. M., Simon P., Taberna P. -L., 3D lithium ion batteries—from fundamentals to fabrication. J. Mater. Chem. 2011, 21, 9876–9890.
  2. Edström K., Brandell D., Gustafsson T., Nyholm L., Electrodeposition as a tool for 3D microbattery fabrication. Electrochem. Soc. Interface. 2011, 20, 41–46.
  3. Wei W., Oltean G., Tai C. –W., Edström K., Björefors F., Nyholm L., High energy and power density TiO2 nanotube electrodes for 3D Li-ion microbatteries. J. Mater. Chem. A. 2013, 1, 8160-8169.
  4. Yiping T., Xiaoxu T., Guangya H., Guoqu Z., Nanocrystalline Li4Ti5O12-coated TiO2 nanotube arrays as three-dimensional anodes for lithium-ion batteries. Electrochimica Acta. 2014, 117, 172–178.
  5. Roy P., Berger S., Schmuki P., TiO2 Nanotubes: Synthesis and Applications. Angew. Chem. Int. Ed. 2011, 50, 2904–2939.
Place, publisher, year, edition, pages
2016.
Keywords [en]
TiO2, nanotubes, lithium, electrodes, free-standing, manufacturing
National Category
Inorganic Chemistry
Research subject
Chemistry with specialization in Inorganic Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-337028OAI: oai:DiVA.org:uu-337028DiVA, id: diva2:1168025
Conference
The 67th ISE Meeting
Available from: 2017-12-19 Created: 2017-12-19 Last updated: 2017-12-19

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