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Redox-active Separators for High-capacity 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.
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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2017 (English)In: Advanced SienceArticle in journal (Refereed) Published
Abstract [en]

High capacity lithium-ion batteries (LIBs) with good charge/discharge rate capabilities are profoundly needed to be able to meet next decade´s energy demand. Various new cathode materials and electrode engineering technologies that enhance battery performance have been developed, but less effort has been dedicated to improving capacity beyond optimizing the electrodes. We present an electrochemically active separator designed to enhance the capacity and charge/discharge rate capability of LIBs. The thin, mesoporous separator consists of an insulating nanocellulose layer in contact with an electrochemically active polypyrrole-nanocellulose supporting layer. Introducing polypyrrole into the separator i) minimizes the commonly observed “dead weight/volume”, ii) transforms the separator into a redox-active component with a conducting upper current-collecting layer, and iii) increases the pore size and porosity of the separator. In comparison with commercial batteries, our LIB with a LiFePO4 cathode and a redox-active separator shows an enhanced charge/discharge rate capability and a much greater capacity (320 mAh g-1) with respect to the weight of the cathode. Rendering the mesoporous separator redox-active could potentially also boost the capacity and rate performance of other types of lithium-ion batteries as well as electric energy storage devices in general. 

Place, publisher, year, edition, pages
2017.
Keywords [en]
separator, cellulose, redox active, lithium, battery
National Category
Inorganic Chemistry Materials Chemistry Engineering and Technology
Research subject
Chemistry with specialization in Materials Chemistry; Engineering Science with specialization in Nanotechnology and Functional Materials
Identifiers
URN: urn:nbn:se:uu:diva-336962DOI: 10.102/advs.201700663OAI: oai:DiVA.org:uu-336962DiVA, id: diva2:1167784
Funder
Swedish Energy Agency, TriLiSwedish Foundation for Strategic Research , RMA-110012StandUpAvailable from: 2017-12-19 Created: 2017-12-19 Last updated: 2017-12-30

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Ruan, ChangqingEdström, KristinaStrömme, Maria
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