Abstract
WS2 is considered as a potential anode material for lithium ion batteries (LIBs) with superior theoretical capacity and stable structure with two-dimensional which facilitates to the transportation and storage of lithium ion. Nevertheless, the commercial recognition of WS2 has been impeded by the intrinsic properties of WS2, including poor electrical conductivity and large volume expansion. Herein, a seaweed-liked WS2/reduced graphene oxide (rGO) composites has been fabricated through a procedure involving the self-assembling of WO42−, hexadecyl trimethyl ammonium ion with graphene oxide (GO) and the subsequent thermal treatment. The WS2/rGO nanocomposite exhibited the outstanding electrochemical property with a stable and remarkable capacity (507.7 mAh·g−1) at 1.0 A·g−1 even after 1000 cycles. This advanced electrochemical property is due to its seaweed-liked feature which can bring in plentiful active sites, ameliorate the stresses arisen from volume variations and increase charge transfer rate.
Highlights
Lithium ion battery, as a green energy storage device, is the alternative to current batteries most potential [1,2,3]
After returning to 1.0 A·g−1, the capacity of WS2/reduced graphene oxide (rGO) composites immediately recovered to 508.5 mAh−1, demonstrating the excellent electrode conductivity and fast Li+ diffusion
The rGO is formed stable seaweed-liked composite with WS2, avoiding a structure collapse of the electrode owing to the huge volume expansion and providing a highly conductive path for electron transport
Summary
As a green energy storage device, is the alternative to current batteries most potential (for example, shows advanced energy density, which is about 4 times higher than nickel-cadmium battery and 1.6 times higher than nickel-metal hydride battery) [1,2,3]. The practical application of TMOs are hampered by their intrinsic property (e.g., poor ion conductivity, and low structural stability origin from the conversion reaction mechanism). To address these issues, two-dimensional (2D) inorganic transition metal dichalcogenides (TMDs) have been introduced, ascribing to their relative high electronic conductivity, superior specific capacity, marvelous structural stability and environment benignity [8,9,10,11,12,13,14,15]. The intrinsic properties can cause the collapse of geometrical configuration in cycling processes, followed by a dramatic performance reduction In this case, enhancing the conductivity of WS2 and improving structural stability are a potential approach to overcome these obstacles. The seaweed-liked WS2/rGO nanocomposites, as an anode material, displays an ultralong cycling life and striking rate performance, it can provide a prominent reversible capacity of 507.7 mAh·g−1 after 1000 cycles at 1.0 A·g−1 and a specific capacity of 108 mAh·g−1 at 20.0 A·g−1, which shows a highly attractive as the electrode to next-generation LIBs
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