Multi‐Functional Layered WS₂ Nanosheets for Enhancing the Performance of Lithium–Sulfur Batteries

Abstract

in order to restrict the loss of material. Furthermore, due to their scalability and flexibility, 3D flexible electronics (see Supporting Information (SI), where Table S1 contains a list) were considered revolutionary materials and were used in many fields such as imperceptible electronic devices, wearable electronic devices, and bionic technology. [11][12][13] Recently studies have shown the encapsulation of sulfur in the pores of carbon materials, such as meso-/microporous carbons, [11] cable-shaped carbon, [12] and carbon nanotubes/fibers, [13] can reduce the capacity fading. However, such nonpolar flexible carbon materials have a destructive disadvantage; they only have physical van der Waals (vdW) adsorption for polar Li 2 S n , which leads to the facile detachment of Li 2 S n from the carbon surface. [14] This proves that carbon-based materials alone cannot serve as the perfect host. In light of this new insight, various types of polar functional groups on carbon-based materials have been demonstrated to increase the interaction between Li 2 S n species and the electrode; these materials can generally be categorized into three types: polymers (polyaniline, polypyrrole, poly(3,4ethylenedioxythiophene) (PEDOT)), [15] metal oxides

Metal Sulfide‐Decorated Carbon Sponge as a Highly Efficient Electrocatalyst and Absorbant for Polysulfide in High‐Loading Li2S Batteries

“…[1][2][3][4][5][6][7][8] Rechargeable lithium-sulfur (Li-S) batteries with a high theoretical specific capacity (1675 mA h g −1 ) and nontoxicity and natural abundance of sulfur have been regarded as perhaps the most promising alternative for next-generation energy storage systems. [1][2][3][4][5][6][7][8] Rechargeable lithium-sulfur (Li-S) batteries with a high theoretical specific capacity (1675 mA h g −1 ) and nontoxicity and natural abundance of sulfur have been regarded as perhaps the most promising alternative for next-generation energy storage systems.…”

A New Type of Multifunctional Polar Binder: Toward Practical Application of High Energy Lithium Sulfur Batteries

“…Therefore, a polar binder capable of adsorbing hydrophilic lithium polysulfides is urgently needed to replace the traditional binder to advance Li-S battery technologies. [1][2][3][4][5] In addition, sulfur has many valuable characteristics, such as extremely low cost, equivalent weight, nontoxicity, and environmental friendliness. As compared to the traditional polymer binders (such as PVDF), [29] the unique advantages of our binder design are featured with abundant amine groups and hyperbranched network structures, which provide the strong affinity to absorb polysulfide intermediates, resulting in remarkably improved cycling performance with an capacity retention of 91.3% over 600 cycles at 2C.…”

“…Moreover, it shows a high sulfurloading areal capacity up to 7.9 mAh cm −2 with stable performance. [1][2][3][4][5] In addition, sulfur has many valuable characteristics, such as extremely low cost, equivalent weight, nontoxicity, and environmental friendliness. [30][31][32] Meanwhile, the elastic and mechanical properties of the binder can buffer the volume changes during repeatable charge and discharge process.…”

Recent development of metal compound applications in lithium–sulphur batteries

“…For instance, WS 2 nanosheets grown on the carbon nanofiber was used as the sulfur host. 144 By combining the advantages of carbon nanofiber (excellent electronic transport of the 3D structure) and WS 2 (polar adsorption of polysulphides), the resulted C@WS 2 /S composite still maintained with a high specific capacity of 502 mA h/g at 2 C, about 90% of its initial specific capacity.…”