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Polydopamine-based redox-active separators 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.ORCID iD: 0000-0001-6118-0226
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Nanotechnology and Functional Materials. (Nanoteknologi och funktionella material)
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Nanotechnology and Functional Materials. (Nanotechnology and Functional Materials)ORCID iD: 0000-0001-5196-4115
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2019 (English)In: Journal of Materiomics, ISSN 2352-8478, p. 204-213Article in journal (Refereed) Published
Abstract [en]

The performance of lithium-ion batteries (LIBs) can be effectively increased with functionalized separators. Herein, it is demonstrated that polydopamine-based redox-active (PRA) separators can provide additional capacity to that of typical anode materials, increase the volumetric capacity of the cell, as well as, decrease the cell resistance to yield an improved performance at higher cycling rates. The PRA separators, which are composed of a 2 μm thick electrically insulating nanocellulose fiber (NCF) layer and an 18 μm thick polydopamine (PDA) and carbon nanotube (CNT) containing redox-active layer, are readily produced using a facile paper-making process. The PRA separators are also easily wettable by commonly employed electrolytes (e.g. LP40) and exhibit a high dimensional stability. In addition, the pore structure endows the PRA separator with a high ionic conductivity (i.e. 1.06 mS cm−1) that increases the rate performance of the cells. Due to the presence of the redox-active layer, Li4Ti5O12 (LTO) half-cells containing PRA separator were found to exhibit significantly higher capacities than the corresponding cells containing commercial separators. These results clearly show that the implementation of this type of redox-active separators constitutes a straightforward and effective way to increase the energy and power densities of LIBs.

Place, publisher, year, edition, pages
Elsevier, 2019. p. 204-213
Keywords [en]
Lithium-ion battery, Separator, Cellulose, Polydopamine, Redox-active
National Category
Nano Technology
Research subject
Engineering Science with specialization in Nanotechnology and Functional Materials
Identifiers
URN: urn:nbn:se:uu:diva-370069DOI: 10.1016/j.jmat.2018.12.007ISI: 000470660000008OAI: oai:DiVA.org:uu-370069DiVA, id: diva2:1272288
Funder
Swedish Energy Agency, 2017-013543Available from: 2018-12-18 Created: 2018-12-18 Last updated: 2019-06-26Bibliographically approved

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Pan, RuijunWang, ZhaohuiSun, RuiLindh, JonasEdström, KristinaStrömme, MariaNyholm, Leif

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