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Lithium titanium oxide materials for hybrid supercapacitor applications
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kemi - Ångström, Strukturkemi.
2016 (Engelska)Självständigt arbete på avancerad nivå (yrkesexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
Abstract [en]

The objective of this thesis was to investigate the suitability of some different Li4Ti5O12 materials as a negative electrode in hybrid supercapacitors. A hybrid supercapacitor is a combination of a battery and an electric double-layer capacitor that uses both a battery material and a capacitor material in the same device. The target for these combination devices is to bridge the performance gap between batteries and capacitors and enable both high energy and power density. To achieve this, materials with high capacity as well as high rate capability are needed. To improve the rate of the commonly slow battery materials nanosizing has been found to be an effective solution.

This study shows that Li4Ti5O12 has a significantly higher experimental capacity than the most common capacitor material, activated carbon. The capacity remained high even at high discharge rates due to a successful nanostructuring that increased the accessibility of the material and shortened the diffusion distance for the ions, leading to a much improved power performance compared with the bulk material. The use of a nanostructured Li4Ti5O12 material in a hybrid device together with activated carbon was estimated to double the energy density compared to an electric double-layer capacitor and maintain the same good power performance. To further increase the energy density also improved materials for the positive electrode should be investigated.

Ort, förlag, år, upplaga, sidor
2016. , s. 59
Serie
UPTEC Q, ISSN 1401-5773 ; 16017
Nyckelord [en]
Nanomaterials, LTO, energy storage, supercapacitors
Nationell ämneskategori
Materialkemi Kompositmaterial och -teknik
Identifikatorer
URN: urn:nbn:se:uu:diva-301977OAI: oai:DiVA.org:uu-301977DiVA, id: diva2:955939
Externt samarbete
Tokyo University of Agriculture and Technology
Utbildningsprogram
Civilingenjörsprogrammet i teknisk fysik med materialvetenskap
Handledare
Examinatorer
Tillgänglig från: 2016-09-07 Skapad: 2016-08-26 Senast uppdaterad: 2016-09-26Bibliografiskt granskad

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