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Electrochemically nanostructured electrodes for Li-ion microbatteries
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Inorganic Chemistry.ORCID iD: 0000-0003-2394-287X
2013 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Electrodeposition is a promising technique for fabricating complex nanostructures and coating these with suitable thin films of active materials. The research presented in this thesis aims at the development of new electro- chemical methods for the synthesis of nanostructured electrodes suitable for Li-ion microbatteries. Electrodes based on nanostructured Cu and Al current collectors have been investigated to provide insight into the fabrication of both anodes and cathodes.

Coating 3D aluminium current collectors with a vanadium oxide thin film is generally accompanied by aluminium corrosion due to the oxidative environment employed in the electrodeposition. To circumvent this issue a protective intermediate MnOx coating was implemented which suppresses the Al corrosion thereby facilitating subsequent vanadium oxide deposition.

3D Cu electrodes with thin Cu2O coatings were fabricated to investigate their electrochemical properties and the mechanism of the Cu2O conversion reaction. Impressive high-rate cycling capabilities and capacity retention were observed with capacities corresponding to 130% of the theoretical capacity obtained after 390 cycles. This capacity gain was linked to electro- chemical milling of the Cu2O particles producing particles smaller than 5 nm. A distribution of particles with different sizes was also observed during the electrochemical analysis. This gave rise to a substantial redox potential distribution and a large electroactive potential window. 

Place, publisher, year, edition, pages
Kph Trycksaksbolaget: Kph , 2013. , 144 p.
Keyword [en]
Electrodeposition, 3D, Li-ion microbatteries, thin films
National Category
Inorganic Chemistry
URN: urn:nbn:se:uu:diva-213433OAI: oai:DiVA.org:uu-213433DiVA: diva2:682068
Available from: 2014-01-08 Created: 2013-12-22 Last updated: 2014-01-08Bibliographically approved
List of papers
1. Electrochemical elaboration of electrodes and electrolytes for 3D structured batteries
Open this publication in new window or tab >>Electrochemical elaboration of electrodes and electrolytes for 3D structured batteries
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2013 (English)In: JOURNAL OF MATERIALS CHEMISTRY A, ISSN 2050-7488, Vol. 1, no 32, 9281-9293 p.Article in journal (Refereed) Published
Abstract [en]

The challenges associated with the fabrication of three-dimensional (3D) electrode and electrolyte materials for Li-ion batteries are discussed. The basic issues for achieving a solid 3D cell foundation, which can simultaneously offer sufficient electronic conductivity to enable stable cycling, as well as enough compatibility with the incorporation of complementary components, have been addressed. Various electrochemical strategies for elaborating such systems are discussed and critically examined. Several current collector systems are presented including electrochemically prepared Cu and Al nanorods and commercial aperiodic carbon structures. Further electrochemical coating approaches then provide a direct method for the deposition of thin layers of active materials successfully demonstrated here as coatings on both 3D metal structures and commercially available 3D-structured carbon substrates. Enhanced capacities per foot print area are demonstrated for a number of 3D electrode materials, namely polyaniline on reticulated vitreous carbon, Cu2O on copper nanorods and TiO2 on Al nanorods. The crucial points for achieving a thin conformal coating of the corresponding 3D electrode structures with solid polymer electrolytes are also carefully analysed and discussed. In this context electro-polymerisation is proposed as a viable route to form thin electrolyte layers with promising characteristics. The high versatility of electro-polymerisation in combination with the various structures and methodologies adopted here represents a further step towards the development of cost-effective 3D microbattery devices.

National Category
Natural Sciences
urn:nbn:se:uu:diva-207063 (URN)10.1039/c3ta11921a (DOI)000322121300036 ()
Available from: 2013-09-09 Created: 2013-09-09 Last updated: 2014-12-15

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