Graphene Labs , Istituto Italiano di Tecnologia , via Morego 30 , 16163 Genova , Italy.
Center for Advancing Electronics Dresden (CFAED), Chair for Molecular Functional Materials, Department of Chemistry and Food Chemistry , Technische Universität Dresden , Mommsenstrasse 4 , 01062 Dresden , Germany.
Nano Lett. 2018 Nov 14;18(11):7155-7164. doi: 10.1021/acs.nanolett.8b03227. Epub 2018 Oct 11.
A novel WS-graphite dual-ion battery (DIB) is developed by combining a conventional graphite cathode and a high-capacity few-layer WS-flake anode. The WS flakes are produced by exploiting wet-jet milling (WJM) exfoliation, which allows large-scale and free-material loss production (i.e., volume up to 8 L h at concentration of 10 g L and exfoliation yield of 100%) of few-layer WS flakes in dispersion. The WS anodes enable DIBs, based on hexafluorophosphate (PF) and lithium (Li) ions, to achieve charge-specific capacities of 457, 438, 421, 403, 295, and 169 mAh g at current rates of 0.1, 0.2, 0.3, 0.4, 0.8, and 1.0 A g, respectively, outperforming conventional DIBs. The WS-based DIBs operate in the 0 to 4 V cell voltage range, thus extending the operating voltage window of conventional WS-based Li-ion batteries (LIBs). These results demonstrate a new route toward the exploitation of WS, and possibly other transition-metal dichalcogenides, for the development of next-generation energy-storage devices.
一种新型 WS-石墨双离子电池（DIB）通过结合传统石墨阴极和高容量少层 WS 薄片阳极开发而成。WS 薄片是通过利用湿法喷射研磨（WJM）剥离生产的，该方法允许在分散体中大规模且无材料损耗地生产（即浓度为 10 g/L 时体积高达 8 L/h，剥离产率为 100%）少层 WS 薄片。基于六氟磷酸盐（PF）和锂离子的 WS 阳极使 DIB 能够以 0.1、0.2、0.3、0.4、0.8 和 1.0 A/g 的电流速率实现 457、438、421、403、295 和 169 mAh/g 的特定电荷容量，优于传统 DIB。基于 WS 的 DIB 的工作电压范围为 0 至 4 V，从而扩展了传统基于 WS 的锂离子电池（LIB）的工作电压窗口。这些结果表明了一种利用 WS 以及可能的其他过渡金属二卤化物来开发下一代储能器件的新途径。
