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Surface activated polyethylene separator promoting Li+ ion transport in gel polymer electrolytes and cycling stability of Li-metal anode
Shanghai Univ, Sch Mat Sci & Engn, Shanghai 200444, Peoples R China;Shanghai Univ, Res Ctr Nanosci & Nanotechnol, Shanghai 200444, Peoples R China.
Shanghai Univ, Res Ctr Nanosci & Nanotechnol, Shanghai 200444, Peoples R China.
Shanghai Univ, Res Ctr Nanosci & Nanotechnol, Shanghai 200444, Peoples R China.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.ORCID iD: 0000-0002-9862-7375
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2019 (English)In: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 368, p. 321-330Article in journal (Refereed) Published
Abstract [en]

This paper proposes a strategy to fabricate surface activated polyethylene (PE)-supported gel polymer electrolyte (GPE) with high ion transport ability, excellent electrolyte retention and mechanical properties to stabilize lithium (Li)-metal anodes. The inert outer and inner pore surface activation of polyethylene is demonstrated by coating an ultrathin zirconium oxide nanocrystal (ZrO2)/polyhedral oligomeric silsesquioxane (POSS) composite layer through a simple layer by layer (LBL) assembly method prior to the in situ polymerization. It is found that the activation layer may improve the Li+ ion transference number and induce the formation of GPE with a gradient structure by the interaction with the initiator system, giving rise to higher ion transport ability of final GPE. On the other hand, the GPE using the activated PE separator as support improves the Li/electrolyte interfacial stability during storage and repeated lithium plating/stripping cycling. A stable voltage profile with cycling for more than 800 h in a Li/Li symmetric cell was obtained by using surface activated PE-supported GPE. When it is assembled into the cells with metallic lithium anodes and lithium cobalt oxide (LiCoO2) cathodes, the cells show excellent rate capability and cycling performance, as well as effective dendrite inhibition.

Place, publisher, year, edition, pages
2019. Vol. 368, p. 321-330
Keywords [en]
Surface activation, Polyethylene support, Gel polymer electrolyte, Li-metal anode
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-382237DOI: 10.1016/j.cej.2019.02.107ISI: 000462769600030OAI: oai:DiVA.org:uu-382237DiVA, id: diva2:1316149
Funder
Swedish Research CouncilAvailable from: 2019-05-16 Created: 2019-05-16 Last updated: 2019-05-16Bibliographically approved

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Mindemark, JonasZhu, Jie-FangEdström, Kristina

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