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Room-Temperature Micropillar Growth of Lithium-Titanate-Carbon Composite Structures by Self-Biased Direct Current Magnetron Sputtering for Lithium Ion Microbatteries
Aalto Univ, Finland.
Aalto Univ, Finland.
Aalto Univ, Finland.
Aalto Univ, Finland.
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2019 (English)In: Advanced Functional Materials, ISSN 1616-301X, E-ISSN 1616-3028, article id 1904306Article in journal (Refereed) Epub ahead of print
Abstract [en]

Here, an unidentified type of micropillar growth is described at room temperature during conventional direct-current magnetron sputtering (DC-MS) deposition from a Li4Ti5O12+graphite sputter target under negative substrate bias and high operating pressure. These fabricated carbon-Li2O-TiO2 microstructures consisting of various Li4Ti5O12/Li2TiO3/LixTiO2 crystalline phases are demonstrated as an anode material in Li-ion microbatteries. The described micropillar fabrication method is a low-cost, substrate independent, single-step, room-temperature vacuum process utilizing a mature industrial complementary metal-oxide-semiconductor (CMOS)-compatible technology. Furthermore, tentative consideration is given to the effects of selected deposition parameters and the growth process, as based on extensive physical and chemical characterization. Additional studies are, however, required to understand the exact processes and interactions that form the micropillars. If this facile method is further extended to other similar metal oxide-carbon systems, it could offer alternative low-cost fabrication routes for microporous high-surface area materials in electrochemistry and microelectronics.

Place, publisher, year, edition, pages
WILEY-V C H VERLAG GMBH , 2019. article id 1904306
Keywords [en]
amorphous carbons; batteries; lithium titanates; microstructures; porous materials
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:liu:diva-159859DOI: 10.1002/adfm.201904306ISI: 000480444500001OAI: oai:DiVA.org:liu-159859DiVA, id: diva2:1346287
Note

Funding Agencies|Academy of Finland CloseLoop project [13303452]

Available from: 2019-08-27 Created: 2019-08-27 Last updated: 2019-08-27

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Helmersson, Ulf
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Plasma and Coating PhysicsFaculty of Science & Engineering
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