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Binder-free oxide nanotube array electrodes for high energy density and power density Li-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, Structural Chemistry.ORCID iD: 0000-0003-4440-2952
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2015 (English)Conference paper, Poster (with or without abstract) (Other academic)
Abstract [en]

Over the past few years, with the increasing power demanding for critical applications from portable devices to electric vehicles, more and more emphasis are focused on achieving high energy and power density Li-ion batteries, i.e., to maximize energy density while retaining a high rate capability. So far, the studies have been mainly dedicated to the development of powder type electrode materials and relatively little attention has been paid to studies of other electrode architectures. Composite electrodes containing a mixture of the active material in the form of a powder (60 wt. %-80 wt. %), binders and conductive additives are still commonly used, which however yield poor material utilization, porous electrode arrangements (i.e. porosities of ~50%) and a lot of complex interfaces.

  In the present work, we demonstrate that highly ordered, binder-free anodic oxide nanotube array electrodes can be used for high energy density and power density Li-ion battery applications. By using 9 mm long anatase TiO2 nanotube electrodes, an areal capacity of 0.19 mAh cm-2 (i.e., 76 mAh g-1) at a charge /discharge current density of 3.5 mA cm-2 (10C rate), and 0.37 mAh cm-2 (i.e., 150 mAh g-1) at 0.07 mA cm-2, can be achieved.[1]  The influence of the nanotube geometry, e.g., length and diameter, on the battery performance was investigated. It is also demonstrated that the rate capability of the nanotube electrode depends mainly on the rate of the electron transfer associated with the lithiation /delithiation reaction with the nanotube length up to 14 mm. With further increased nanotube length, the rate capability of nanotube electrode gradually decays but the areal capacity of nanotube electrodes can still be increased up to 1 mAh cm-2 with the tube length of 40 mm. [2] On the other side, well-defined TiO2 nanotube size gradient thin films can be manufactured using a bipolar electrochemistry approach, which contains well controlled nanotube size distribution and can be readily be used as versatile monolithic hybrid electrodes for energy storage devices.[3] Such free-standing anatase TiO2 nanotube size gradient electrodes provide unprecedented areal capacities at cycling rates from C/5 (i.e. 175 mAh cm-2) to 50C (i.e. 40 mAh cm-2).

 

References

  1. W. Wei, G. Oltean, C. -W. Tai, K. Edström, F. Björefors, L. Nyholm, J. Mater. Chem. A 2013, 1,8160
  2. W. Wei, C. Ihrfors, F. Björefors, L. Nyholm, J. Mater. Chem. A,  in manuscript
  3. W. Wei, F. Björefors, L. Nyholm, J. Mater. Chem. A,  under review

 

Place, publisher, year, edition, pages
2015.
Keyword [en]
TiO2, nanotubes, electrodes, lithium, batteries, free-standing
National Category
Inorganic Chemistry
Research subject
Chemistry with specialization in Inorganic Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-337038OAI: oai:DiVA.org:uu-337038DiVA, id: diva2:1168044
Conference
Oorgandagarna 2015
Funder
StandUp
Available from: 2017-12-19 Created: 2017-12-19 Last updated: 2017-12-30

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