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Redox-Active Separators for Lithium-Ion Batteries
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, Chemistry, Department of Chemistry - Ångström, Inorganic Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Nanotechnology and Functional Materials.
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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2018 (English)In: ADVANCED SCIENCE, ISSN 2198-3844, Vol. 5, no 3, article id 1700663Article in journal (Refereed) Published
Abstract [en]

A bilayered cellulose-based separator design is presented that can enhance the electrochemical performance of lithium-ion batteries (LIBs) via the inclusion of a porous redox-active layer. The proposed flexible redox-active separator consists of a mesoporous, insulating nanocellulose fiber layer that provides the necessary insulation between the electrodes and a porous, conductive, and redox-active polypyrrole-nanocellulose layer. The latter layer provides mechanical support to the nanocellulose layer and adds extra capacity to the LIBs. The redox-active separator is mechanically flexible, and no internal short circuits are observed during the operation of the LIBs, even when the redox-active layer is in direct contact with both electrodes in a symmetric lithium-lithium cell. By replacing a conventional polyethylene separator with a redox-active separator, the capacity of the proof-of-concept LIB battery containing a LiFePO4 cathode and a Li metal anode can be increased from 0.16 to 0.276 mA h due to the capacity contribution from the redox-active separator. As the presented redox-active separator concept can be used to increase the capacities of electrochemical energy storage systems, this approach may pave the way for new types of functional separators.

Place, publisher, year, edition, pages
WILEY , 2018. Vol. 5, no 3, article id 1700663
Keywords [en]
capacity, cellulose, conducting polymers, lithium-ion batteries, redox-active separators
National Category
Materials Chemistry Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-354519DOI: 10.1002/advs.201700663ISI: 000428310500012PubMedID: 29593967OAI: oai:DiVA.org:uu-354519DiVA, id: diva2:1233979
Funder
Swedish Foundation for Strategic Research , RMA-110012]Swedish Energy AgencyStandUpCarl Tryggers foundation Available from: 2018-07-20 Created: 2018-07-20 Last updated: 2018-07-25Bibliographically approved

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