WS2-graphite dual-ion battery

TL;DR

This paper introduces a WS2-graphite dual-ion battery with high capacity and voltage range, utilizing mass-produced WS2 flakes to outperform conventional dual-ion batteries and extend the application of transition metal dichalcogenides in energy storage.

Contribution

The study develops a novel WS2-graphite dual-ion battery with high-capacity WS2 flakes produced via wet-jet milling, achieving superior performance and voltage range compared to traditional designs.

Findings

Achieved charge capacities up to 457 mAh g-1 at 0.1 A g-1

Extended operating voltage to 0-4 V range

Demonstrated potential for next-generation energy storage

Abstract

A novel WS2-graphite dual-ion battery (DIB) is developed by combining together a conventional graphite cathode and high-capacity few-layer WS2 flakes anode. The WS2 flakes are produced by exploiting wet-jet milling (WJM) exfoliation, which allows mass production of few-layer WS2 flakes in dispersion, with an exfoliation yield of 100%. 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 towards the exploitation of WS2, and possibly other transition metal dichalcogenides (TMDs), for the development of next-generation energy storage devices.