Multi-walled carbon-nanotube-decorated tungsten ditelluride nanostars as anode material for lithium-ion batteries

Abstract

Multi-walled carbon-nanotube (MWCNT)-decorated WTe 2 nanostars (WTe 2 @CNT nanocomposites) are to be employed for the first time as anode candidates in the development of lithium-ion (Li-ion) batteries. WTe 2 @CNT nanocomposites deliver a high discharge capacity of 1097, 475, 439, 408, 395 and 381 mA h g −1 with an increasing current density of 100, 200, 400, 600, 800 and 1000 mA g −1 , respectively, while WTe 2 nanostars exhibit a reversible capacity of 655, 402, 400, 362, 290 and 197 mA h g −1 with the aforementioned current densities. Furthermore, WTe 2 @CNT nanocomposites exhibit a superior reversible capacity of 592 mA h g −1 at 500 mA g −1 with a capacity retention of 100% achieved over 500 cycles, while bare WTe 2 nanostars deliver ∼85 mA h g −1 over 350 cycles. This remarkable Li cycling performance is attributed to MWCNTs interconnected with WTe 2 nanostars. In addition, the exposed active interlayers of the WTe 2 nanostars, which are responsible for maintaining the structural integrity of the electrodes, buffer the large volume expansion within the WTe 2 nanostars, avoiding the agglomeration of the particles. The layered WTe 2 nanostars were synthesized via the solutionphase method, and present extremely good possibilities for the scaling-up of Li-ion battery storage systems.

High Performance Lithium‐Ion Batteries Using Layered 2H‐MoTe2 as Anode

“…for LIBs as the reference. [ 27 ] Additionally, we have considered as references the mechanism that was followed by other chalcogenides, namely, MoS 2 , [ 14,31 ] MoSe 2, [ 15,32 ] WS 2 , [ 16 ] WSe 2 , [ 17,33 ] and WTe 2 [ 18,34 ] because their crystal structures are similar to that of MoTe 2 . Additional emphasis is placed on the delithiation mechanism, which we have explored in this work through the in situ XANES analysis that is supplemented by DFT.…”

“…They are promising due to their electrochemical, catalytic, electronic and optoelectronic properties, which give these unique layered structures high specific capacities and remarkably stable electrochemical performances. [ 8–13 ] The compounds of group 6 TMDs that have an MX 2 structure, where M stands for (Mo and W) and X stands for chalcogens (S, Se, Te) such as MoS 2 , [ 14 ] MoSe 2 , [ 15 ] WS 2, [ 16 ] WSe 2, [ 17 ] and WTe 2 [ 18 ] and so on have been used as anodes in LIBs. Molybdenum‐based MoTe 2 is a fascinating TMD because it is a polymorphic material that can exist both in a hexagonal semiconducting (2H) phase and a monoclinic semi‐metallic (1T′) phase.…”

A Review on the Current Progress and Challenges of 2D Layered Transition Metal Dichalcogenides as Li/Na‐ion Battery Anodes

“…The core‐shell structure exhibited excellent specific capacity (388 mA h g −1 ) over the other morphologies, bare MoTe 2 and C/MoTe 2 composite. Similarly WTe 2 has also been explored as both Li and Na‐ion battery anode [117e,f] . Hong et al .…”

Flexible Films as Anode Materials Based on rGO and TiO2/MnO2 in Li-Ion Batteries Free of Non-Active Agents

“…Currently, the most commercially used anode material is graphite, with a maximum theoretical capacity of 372 mAh/g [5]. Hence, many researchers developed new anode materials with higher capacities, such as transition-metal oxides [6,7] or other carbon-based materials, such as graphene, carbon nanotubes [8,9] and their composites [10,11]. Graphene and its derivatives have many distinctive properties, such as a large specific surface area (2630 m 2 /g) [12], a high thermal conductivity (3000-5000 W/mK) [13] and a high carrier mobility at room temperature (~10,000 cm 2 /Vs) [14].…”