WS₂–Graphite Dual-Ion Batteries

Abstract

A novel WS 2 −graphite dual-ion battery (DIB) is developed by combining a conventional graphite cathode and a high-capacity few-layer WS 2flake anode. The WS 2 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 fewlayer WS 2 flakes in dispersion. The WS 2 anodes enable DIBs, based on hexafluorophosphate (PF 6 − ) 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 WS 2 -based DIBs operate in the 0 to 4 V cell voltage range, thus extending the operating voltage window of conventional WS 2 -based Li-ion batteries (LIBs). These results demonstrate a new route toward the exploitation of WS 2 , and possibly other transition-metal dichalcogenides, for the development of next-generation energy-storage devices.

Scalable Production of Graphene Inks via Wet‐Jet Milling Exfoliation for Screen‐Printed Micro‐Supercapacitors

“…The WJM apparatus, as schematically illustrated in Figure a, makes use of a high‐pressurized jet stream to homogenize and exfoliate the sample, that is, a layered material . More in detail, a hydraulic mechanism and a piston supply the pressure in order to direct the mixture of solvent and layered crystals into the processor, where the generation of shear forces promotes the sample exfoliation . Additional details of the WJM process, including the description of the processor, are reported in Figure S1, Supporting Information.…”

“…Additional details of the WJM process, including the description of the processor, are reported in Figure S1, Supporting Information. The time during which the layered materials are subjected to exfoliation is less than one second . Immediately after the processor, the sample is cooled down by means of a chiller.…”

Hybrid Aqueous/Nonaqueous Water‐in‐Bisalt Electrolyte Enables Safe Dual Ion Batteries

“…[ 6–11 ] Different from storing and releasing energy through metal ions shuttling between the positive and negative electrodes in the charging and discharging processes of the traditional metal ion batteries, DIBs store and release energy through the insertion/extraction of anions and cations in the electrolyte into/from the cathode and anode. [ 12–15 ] Therefore, DIBs have the higher working voltage. Moreover, employing graphite as the active material of the cathode can further improve the working voltage (>5 V) of DIBs, as well as reduces the material cost and meanwhile exhibits good environmental friendliness.…”

Interlayer gap widened α-phase molybdenum trioxide as high-rate anodes for dual-ion-intercalation energy storage devices

“…The high anion-intercalating potential (>4.0 V vs. Li/Li + ) and ultrafast rate capability (78% capacity retention, up to 100 C rate) enable graphitic carbon a promising cathode for constructing energy storage devices with both high energy and power densities 14 . Previous studies have proposed several new DIES devices by assembling graphite cathode with conventional battery-type anodes (such as Li metal 14 , graphite 15 , Al metal 16 , Sn metal 17 , WS 2 18 , etc.). However, the power performance of DIES devices is still limited, and there is great interest in designing high-rate pseudocapacitive anode to be combined with graphite cathode to assemble high-energy, high-power DIES device.…”