In:
Inorganic Chemistry Frontiers, Royal Society of Chemistry (RSC), Vol. 10, No. 4 ( 2023), p. 1187-1196
Abstract:
Currently, the investigation of two-dimensional (2D) crystalline materials, notably transition metal tungsten-based sulfides, is scarcely reported in the wide-temperature field. Thus, tungsten sulphide encapsulated in a sulphurized polyacrylonitrile composite (WS 2 –SPAN) was prepared using an electrospinning technology combined with a sulphuration process. By virtue of the abundant S vacancies and in situ N doping, the WS 2 –SPAN composite shows an impressively ultralong lifespan and stable circulation capacity over a wide temperature range (−15–50 °C). For sodium storage, the WS 2 –SPAN-2 composite delivers optimized high-rate performance and ultrastable cycling properties (464 mA h g −1 /450 cycles at 0.5 A g −1 ; 354 mA h g −1 /1400 cycles at 2 A g −1 , 190 mA h g −1 /12 000 cycles at 5 A g −1 ; 129 mA h g −1 /18 000 cycles at 10 A g −1 , surpassing previously reported WS 2 -based anodes for SIBs). This is paired with an Na 3 V 2 (PO 4 ) 3 cathode, which exhibits excellent storage capacity (241 mA h g −1 /200 cycles at 0.5 A g −1 ). Potassium storage also demonstrates admirable performance (362 mA h g −1 /100 cycles at 0.1 A g −1 ; 278 mA h g −1 /3000 cycles at 1 A g −1 ). In addition, a detailed illustration of the electrochemical storage mechanism of WS 2 –SPAN composites is presented through theoretical calculations and electrochemical dynamics. Thus, the present investigation provides new insights into the preparation of novel WS 2 -based anodes for sodium/potassium-ion batteries with ultralong lifespans and wide-temperature workability.
Type of Medium:
Online Resource
ISSN:
2052-1553
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2023
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