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Polyethylene separators modified by ultrathin hybrid films enhancing lithium ion transport performance and Li-metal anode stability
Shanghai University, Research Center of Nanoscience and Nanotechnology, Shanghai.
Shanghai University, Research Center of Nanoscience and Nanotechnology, Shanghai.
University of Shanghai for Science and Technology, School of Medical Instrument and Food Engineering, Shanghai.
Shanghai University, Research Center of Nanoscience and Nanotechnology, Shanghai.
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2018 (English)In: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 259, p. 386-394Article in journal (Refereed) Published
Abstract [en]

Poor stability of lithium metal anodes in liquid electrolytes hinders its practical application in rechargeable batteries with very high energy density. Herein, we present an approach to tackle the intrinsic problems of Li metal anodes from the standpoint of separators. By a facile and versatile method based on mussel-inspired surface chemistry, a hybrid polydopamine/octaammonium POSS (PDA/POSS) coating was spontaneously formed on the surface of PE separators through the self-polymerization and strong adhesion feature of dopamine. This ultrathin PDA/POSS coating endows PE separators with different surface characteristics while keeping its microporous structure almost unchanged. The altered surface characteristics influence the separator/electrolyte interaction, and lead to remarkable enhanced ionic conductivity (from 0.36 mS cm−1 to 0.45 mS cm−1) and Li+ ion transference number (from 0.37 to 0.47) of PE separators as well as the improved stability of lithium/electrolyte interface, which effectively decreases the electrode polarization and suppresses the lithium dendrites formation, contributing to superior C-rates capability and cycling performance of cells.

Place, publisher, year, edition, pages
2018. Vol. 259, p. 386-394
Keywords [en]
Li-metal anode, Li+ ion transference number, Ionic conductivity, Cycling performance
National Category
Materials Chemistry Inorganic Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-346357DOI: 10.1016/j.electacta.2017.10.120ISI: 000423968600043OAI: oai:DiVA.org:uu-346357DiVA, id: diva2:1191108
Available from: 2018-03-16 Created: 2018-03-16 Last updated: 2018-03-16Bibliographically approved

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Zhu, Jiefang

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