Journal
NANO LETTERS
Volume 18, Issue 11, Pages 7155-7164Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.8b03227
Keywords
Dual-ion batteries; tungsten disulfide (WS2); transition metal dichalcogenides (TMDs); two-dimensional materials; wet-jet milling exfoliation; electrical energy storage (EES)
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Funding
- European Union's Horizon 2020 research and innovation program [785219]
- German Research Foundation (DFG) within the Cluster of Excellence Center for Advancing Electronics Dresden (CFAED)
- MAECI (Ministero degli Affari Esteri e della Cooperazione Internazionale)
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A novel WS2-graphite dual-ion battery (DIB) is developed by combining a conventional graphite cathode and a high-capacity few-layer WS2-flake anode. The WS2 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(-1) at concentration of 10 g L-1 and exfoliation yield of 100%) of few-layer WS2 flakes in dispersion. The WS2 anodes enable DIBs, based on hexafluorophosphate (PF6-) and lithium (Li+) ions, to achieve charge-specific capacities of 457, 438, 421, 403, 295, and 169 mAh g(-1) at current rates of 0.1, 0.2, 0.3, 0.4, 0.8, and 1.0 A g(-1), respectively, outperforming conventional DIBs. The WS2-based DIBs operate in the 0 to 4 V cell voltage range, thus extending the operating voltage window of conventional WS2-based Li-ion batteries (LIBs). These results demonstrate a new route toward the exploitation of WS2, and possibly other transition-metal dichalcogenides, for the development of next-generation energy-storage devices.
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