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Mesoporous Cladophora cellulose 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, Technology, Department of Engineering Sciences, Nanotechnology and Functional Materials.
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.
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2016 (English)In: Journal of Power Sources, ISSN 0378-7753, E-ISSN 1873-2755, Vol. 321, 185-192 p.Article in journal (Refereed) Published
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Abstract [en]

Much effort is currently made to develop inexpensive and renewable materials which can replace the polyolefin microporous separators conventionally used in contemporary lithium-ion batteries. In the present work, it is demonstrated that mesoporous Cladophora cellulose (CC) separators constitute very promising alternatives based on their high crystallinity, good thermal stability and straightforward manufacturing. The CC separators, which are fabricated using an undemanding paper-making like process involving vacuum filtration, have a typical thickness of about 35 mu m, an average pore size of about 20 nm, a Young's modulus of 5.9 GPa and also exhibit an ionic conductivity of 0.4 mS cm(-1) after soaking with 1 M LiPF6 EC: DEC (1/1, v/v) electrolyte. The CC separators are demonstrated to be thermally stable at 150 degrees C and electrochemically inert in the potential range between 0 and 5 V vs. Li+/Li. A LiFePO4/Li cell containing a CC separator showed good cycling stability with 99.5% discharge capacity retention after 50 cycles at a rate of 0.2 C. These results indicate that the renewable CC separators are well-suited for use in high-performance lithium-ion batteries.

Place, publisher, year, edition, pages
2016. Vol. 321, 185-192 p.
Keyword [en]
Separator, Cellulose, Crystallinity, Paper-making, Lithium-ion battery, Cladophora
National Category
Inorganic Chemistry Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-299548DOI: 10.1016/j.jpowsour.2016.04.115ISI: 000377729200020OAI: oai:DiVA.org:uu-299548DiVA: diva2:949809
Funder
Swedish Energy AgencyStandUpStiftelsen Olle Engkvist Byggmästare
Available from: 2016-07-25 Created: 2016-07-22 Last updated: 2016-12-01Bibliographically approved

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Pan, RuijunCheung, OceanWang, ZhaohuiTammela, PetterLindh, JonasEdström, KristinaStrömme, MariaNyholm, Leif
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Journal of Power Sources
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