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- Pan, Ruijun, et al.
(författare)
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Nanocellulose Modified Polyethylene Separators for Lithium Metal Batteries
- 2018
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Ingår i: Small. - : Wiley-VCH Verlagsgesellschaft. - 1613-6810 .- 1613-6829. ; 14:21
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Tidskriftsartikel (refereegranskat)abstract
- Abstract Poor cycling stability and safety concerns regarding lithium (Li) metal anodes are two major issues preventing the commercialization of highâenergy density Li metalâbased batteries. Herein, a novel triâlayer separator design that significantly enhances the cycling stability and safety of Li metalâbased batteries is presented. A thin, thermally stable, flexible, and hydrophilic cellulose nanofiber layer, produced using a straightforward paperâmaking process, is directly laminated on each side of a plasmaâtreated polyethylene (PE) separator. The 2.5 µm thick, mesoporous (â20 nm average pore size) cellulose nanofiber layer stabilizes the Li metal anodes by generating a uniform Li+ flux toward the electrode through its homogenous nanochannels, leading to improved cycling stability. As the triâlayer separator maintains its dimensional stability even at 200 °C when the internal PE layer is melted and blocks the ion transport through the separator, the separator also provides an effective thermal shutdown function. The present nanocelluloseâbased triâlayer separator design thus significantly facilitates the realization of highâenergy density Li metalâbased batteries.
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