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β-Cyclodextrin-modified high-performance black phosphorus-based battery separators
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DOI：10.1016/j.matlet.2023.135827.png)
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Abstract
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The properties associated with battery separators are critical for achieving long cycle performance as well as fast charging/discharging of black phosphorus-based lithium-ion batteries. Current commercially available polyolefin separators (e.g. Celgard-2500) has an insufficient wettability and weak ionic conductivity, which could be affect to both capacity retention and high capacity of lithium-ion batteries. To improve the performance of the battery, one of the most effective methods is to coat functional materials on the surface of the separator. In this paper, beta-cyclodextrin (beta-CD) modified separator (CD-separator) was fabricated through simple vacuum filtration. With the merits of the unique properties of the beta-CD, such as the funnel effect, the ionic conductivity of the modified separator (named CD-separator) rise from 0.24 mS cm(-1) to 1.051 mS cm(-1). And the CD-separator exhibit a better compatibility with contact angle of 41.9 degrees, lower than that of polyolefin separator of 50.3 degrees. The battery with CD-separator exhibits a high reversible specific capacity of 1036.3 mAh/g at a high current density of 4.0 A/g after 1000 cycles, which much higher than that of the battery with polyolefin separator (e.g. Celgard-2500, 752.8 mAh/g).
Keywords:
beta-Cyclodextrin
Black phosphorus
Separator
Lithium-ion battery
Composite materials
Nanocomposites
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